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Protocols in ecological and environmental plant physiology

 
 

Australian Journal of Botany is an international journal for the publication of original research and reviews in plant science with relevance to Southern Hemisphere ecosystems including ecology and ecophysiology, conservation biology and biodiversity, forest biology and management, cell and molecular biology, palaeobotany, reproductive biology and genetics, mycology and pathology and structure and development. More...

Editor-in-Chief: Dick Williams

 
 
 

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Published online 29 May 2015
Hyperaccumulators from the serpentines of Andaman, India 
S. Datta, K. Chaudhury and P. K. Mukherjee

A typical dwarfed sclerophyllous vegetation is found to occur in some parts of north and south Andaman where outcrops of ophiolite occur. A total of 11 hyperaccumulators of nickel were identified from there, belonging to eight genera and seven families. Of these, six species are additions to the list of hyperaccumulators and three species as hemiaccumulators.

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Published online 26 May 2015
An evaluation of the genetic structure of seed sources and the maintenance of genetic diversity during establishment of two yellow box (Eucalyptus melliodora) seed-production areas 
Linda M. Broadhurst, Graham Fifield, Bindi Vanzella and Melinda Pickup

Seed production areas (SPAs) are one way to ensure the regular supply of high genetic quality seed for restoration. This evaluation of two Yellow Box SPAs found that genetic diversity is similar to that of natural populations. These SPAs will provide high quality seed for future restoration projects and reduce the need to collect from wild populations.

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Published online 22 May 2015
Dormancy is modulated by seed structures in palms of the cerrado biome 
V. S. Carvalho, L. M. Ribeiro, P. S. N. Lopes, C. O. Agostinho, L. J. Matias, M. O. Mercadante-Simões and L. N. F. Correia

Seeds of species adapted to the environments with seasonal climates commonly have sophisticated mechanisms for delaying germination, which contributes to the development of plants in favourable occasions. In this paper we investigate how the structures of palm seeds of Cerrado (Brazilian savannah) influence germination. We found that differences in both the embryo size as the seed coat thickness make the germination be distributed over time, which affects the pattern of geographic distribution of species.

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Published online 22 May 2015
Reproductive success of Acacia longifolia (Fabaceae, Mimosoideae) in native and invasive populations 
Marta Correia, Sílvia Castro and Susana Rodríguez-Echeverría

More and bigger seeds contribute to the invasive success of the Australian species A. longifolia in Portugal. This study compared selfing and reproductive success of A. longifolia showing no changes in selfing but an increase in the quantity and size of the seeds produced in the invaded region even for self-pollinated fruits. Intercontinental comparisons, such as this, are scarce but essential to understand invasion by exotic plants.

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Published online 21 May 2015
Conservation genetics and geographic patterns of genetic variation of the vulnerable officinal herb Fritillaria walujewii (Liliaceae) 
Zhihao Su, Borong Pan, Stewart C. Sanderson, Xiaojun Shi and Xiaolong Jiang

Population genetics and evolutionary histories of threatened plants need to be understood to establish effective conservation strategies. We studied the genetic patterns of Fritillaria walujewii and found that Xinyuan County is the centre of diversification, and that populations in the eastern Tianshan Mountains were colonised from the Yili Valley. This information will provide prudent management strategies for its recovery.

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Published online 18 May 2015
Cytological study of Polystichum (Dryopteridaceae) species from southern South America 
Rita E. Morero, Franco E. Chiarini, Juan Urdampilleta, Gloria E. Barboza and David S. Barrington

This study provides the first cytological approach on nine Polystichum species in order to increase our understanding of their systematic relationship. We found 2x, 4x and 8x ploidy levels, genome downsizing in polyploids, sexual reproduction, and spore size correlated with ploidy level. These evidences and a cytological literature survey suggest different evolutionary paths between species from southern South America and those of northern and central Andes Mountains.

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Published online 11 May 2015
Developmental phenology of Persoonia longifolia (Proteaceae) and the impact of fire on these events 
K. A. Chia, J. M. Koch, R. Sadler and S. R. Turner

We undertook a comprehensive study over a 3-year period to detail the growth, flowering, fruiting and germination biology of Persoonia longifolia (snottygobble). Plants produced vegetative growth, flowers and fruit during summer months and germination occurred during late winter from seed that is at least 1-year old, with these responses affected by fire. This research is vital for developing methods of returning this plant to rehabilitated areas of the jarrah forest, in south-western Australia.

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Published online 08 May 2015
The reproductive biology of the introduced root holoparasite Orobanche ramosa subsp. mutelii (Orobanchaceae) in South Australia 
Jane Prider

Knowledge of the seed production of invasive species is vital for weed risk assessments and control programs. We investigated aspects of the seed production of broomrape and found that each flower can produce over 1000 viable seeds within 10 days of the flower dying. This species has similar seed traits to other broomrapes which are important weeds of crops worldwide.

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Published online 08 May 2015
Ecotypic differentiation of mid-Atlantic Quercus species in response to ultramafic soils 
Jerry Burgess, Katalin Szlavecz, Nishanta Rajakaruna and Christopher Swan

Geologic juxtapositions can result in nutrient-poor and shallow ultramafic or serpentinite soils placed adjacent to well developed and nutrient-rich mafic soils. Tree species growing in these soils are likely to employ different mechanisms to cope with the distinct edaphic conditions. The results suggested that the edaphic factor is a strong environmental constraint, forcing unique physiological differences among seedlings of Quercus species, leading to site-specific adaptive characteristics. Such morphological and physiological responses allow for a better understanding of the mechanisms controlling plant–soil associations.

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Published online 06 May 2015
The flora of ultramafic soils in the Australia–Pacific Region: state of knowledge and research priorities 
Antony van der Ent, Tanguy Jaffré, Laurent L'Huillier, Neil Gibson and Roger D. Reeves

In the Australia–Pacific Region ultramafic soils cover large surface areas. In New Caledonia 2150 plant species (83% endemic) are known from these soils. This compares to 1355 taxa in Western Australia and 553 species in Queensland. Ni hyperaccumulator species number 65 in New Caledonia, one in Western Australia and two in Queensland. There is a need for evolutionary research on hyperaccumulation.

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Published online 06 May 2015
The role of phosphorus deficiency in nodule microbial composition, and carbon and nitrogen nutrition of a native legume tree in the Cape fynbos ecosystem 
Anathi Magadlela, Waafeka Vardien, Aleysia Kleinert, Léanne L. Dreyer and Alexander J. Valentine

Legumes native to low-nutrient ecosystems need atmospheric nitrogen to survive. Phosphorus deficiency in the nodule bacterial composition’s role in biological nitrogen fixation (BNF) was investigated and it was found that BNF was more efficient, even though the bacterial composition was unaffected. The bacterial species inside legume nodules may be highly adapted to function in P-poor soils, for host N provision.

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Published online 29 April 2015
Practical and theoretical implications of a browsing cascade in Tasmanian forest and woodland 
Alister Hazeldine and Jamie B. Kirkpatrick

Animal browsing can transform tree and forest. We found that wallabies and pademelons preferred to eat prickly box and native cherries, and avoided many wattles, but would eat all small trees as seedlings. Their browsing appeared to keep dry forests more open, and less prone to fire damage, than would otherwise have been the case.

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Published online 28 April 2015
Metals and secondary metabolites in saxicolous lichen communities on ultramafic and non-ultramafic rocks of the Western Italian Alps 
Sergio E. Favero-Longo, Enrica Matteucci, Mariagrazia Morando, Franco Rolfo, Tanner B. Harris and Rosanna Piervittori

This work compares lichen colonisation on different ultramafic lithologies, exploring metabolic adaptation to substrate-related metal stress. Physical factors such as surface disaggregation determine lichen abundance on the different lithologies, whereas the presence or absence of certain secondary metabolites accounts for a community-level adaptation to different metal concentrations in the colonised rocks. This research contributes to knowledge of biological adaptation to metal stresses in natural environments and of the ecological significance of lichen secondary metabolites.

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Published online 24 April 2015
Determining maturity and population structure in Macrozamia parcifolia (Zamiaceae), a threatened Australian cycad 
Adrian C. Borsboom, Jian Wang and Paul I. Forster

Worldwide there are many threatened cycads, and for trunkless species, determining what constitutes a mature plant and incorporating this information into a population structure is difficult. Demonstrated for one threatened, trunkless Australian cycad is a new, simple and effective method of determining maturity and population structure. This method and the knowledge derived will aid in its conservation management, and could be applied to other threatened cycads.

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Published online 23 April 2015
An ecological study of the central Queensland ultramafic endemic shrub Neoroepera buxifolia (Picrodendraceae), Australia 
Rebecca Hendry, Kevin Wormington and Kerry Walsh

Neoroepera buxifolia is an endemic shrub to small tree that is restricted to the creeks, riverbanks and drainage lines of the central Queensland ultramafic landscape. It is associated with high levels of soil magnesium and this study seeks investigate the relationships of N. buxifolia with the soil elements. Nickel in the soil had the greatest positive influence on tree height and the standing volume was greatest in the upper tributaries.

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Published online 23 April 2015
A geobotanical investigation of the Koedoesfontein Complex, Vredefort Dome, South Africa 
R. B. Boneschans, M. S. Coetzee and S. J. Siebert

Ultramafic rocks and their chemically distinct soil products are generally known to affect vegetation floristics and species productivity. Little is known on how the vegetation characteristics of the Vredefort Dome in South Africa are affected by these rock types, and the present study discloses several species that seem to be associated with ultramafic–mafic intrusions within the dome, as well as geochemically contrasting rock types. Because of their strong relationship with different geological substrates, identified species groups can serve as useful indicators for chemical and mineralogical changes in soil and geology.

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Published online 23 April 2015
Biogeochemistry and geobotany of the serpentine soils of the Rezvanshahr area in northwestern Iran: a preliminary investigation 
Ahmad Mohtadi and Seyed M. Ghaderian

Ultramafic rocks occur in many areas in Iran. The aim of the present study was to document the plants growing on the ultramafic soils of the Rezvanshahr area, and to identify serpentine endemics and metal accumulator plants, if any, from this area. In this study, soils and 22 plant species belonging to 13 families from this area were collected and analysed for serpentine-associated metals.

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Published online 23 April 2015
Structure, floristics and diversity of tropical montane rain forests over ultramafic soils on Mount Kinabalu (Borneo) compared with those on non-ultramafic soils 
Shin-ichiro Aiba, Yoshimi Sawada, Masaaki Takyu, Tatsuyuki Seino, Kanehiro Kitayama and Rimi Repin

Mount Kinabalu, Borneo, with the summit elevation of 4095 m and diverse geology, is one of the global centres of plant diversity. By using vegetation sample plots, we compared the tropical montane rain forests over ultramafic soils with those over non-ultramafic soils on Mount Kinabalu, and also with those on other mountains with ultramafic soils in South-east Asia. The results demonstrated the uniqueness of the ultramafic vegetation on Mount Kinabalu.

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Published online 21 April 2015
A preliminary survey of the diversity of soil algae and cyanoprokaryotes on mafic and ultramafic substrates in South Africa 
Arthurita Venter, Anatoliy Levanets, Stefan Siebert and Nishanta Rajakaruna

Algae and cyanoprokaryotes can colonise almost all soil types but little is known about the occurrence of these organisms in South African serpentine soils. We found a unique species assemblage in one of the serpentine sites with high metal concentrations, but the findings are preliminary and the effect of vegetation and climate on the presence of algae should be further investigated.

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Published online 17 April 2015
Metal-accumulating plants from serpentine habitats of K?z?lda?, Konya Province, Turkey 
A. Aksoy, Z. Leblebici and M. N. V. Prasad

Unique flora established on serpentine habitats of Kızıldağ, Konya Province, Turkey is dealt in this paper. This flora is rich in endemic metal hyperaccumulators, particularly nickel, rather unusual and potentially valuable plant resources, therefore, deserves conservation. The Ni-hyperaccumulating species from Turkey are invaluable plant genetic resource for investigations on phytoremediation, phytomining and agromining emerging fields of farming for metals.

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Published online 17 April 2015
A preliminary study of the role of bacterial–fungal co-inoculation on heavy metal phytotoxicity in serpentine soil 
Mihiri Seneviratne, Gamini Seneviratne, H. M. S. P. Madawala, M. C. M. Iqbal, Nishanta Rajakaruna, Tharanga Bandara and Meththika Vithanage

We investigated the role of bacterial–fungal interactions on heavy metal uptake by Zea mays plants. Soil nutrients and soil enzyme activities were also measured to determine the effect of microbial inoculations on soil quality. We report the synergistic effect of bacterial–fungal inoculation in enhancing soil-quality and promoting plant growth in the presence of heavy metals.

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Published online 09 April 2015
Elemental composition of plants from the serpentine soil of Sugashima Island, Japan 
Takafumi Mizuno and Yoko Kirihata

Elemental composition of plants from the serpentine soil of in Sugashima Island, Japan was investigated. Plants had a tendency to accumulate Ni in high correlation with Fe, but Buxus microphylla, had the highest Ni concentration with the average Fe level. This suggests that plants that accumulate high Ni but low Fe may be more adaptive for serpentine soil environment.

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Published online 09 April 2015
Extended vegetation histories from ultramafic karst depressions 
Geoffrey Hope

Rocks high in iron and magnesium are moderately soluble in wet tropical climates and land-surface features such as sinkholes are formed, similar to those in limestones. Low nutrients and heavy metal toxicity slow the build-up of organic matter in many of these hollows and they can preserve records of long-term vegetation change over 50 000 years ago. Dating of the organic material is not straightforward in these open systems and chronological problems limit the studies in some cases.

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Published online 07 April 2015
Vegetation dynamics and mesophication in response to conifer encroachment within an ultramafic system 
J. Burgess, K. Szlavecz, N. Rajakaruna, S. Lev and C. Swan

Local biodiversity and endemic species are being endangered as an historically unique woodland system is succumbing to encroachment. This work used an integrated approach combining data from geology, ecology and soils to examine the successional trajectory of a unique woodland ecosystem. The data show that a system once dominated by prairie-type grasses is now transitioning to a traditional piedmont forest.

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blank image Australian Journal of Botany
Volume 63 Number 1 & 2 2015
Ultramafic Ecosystems: Proceedings of the 8th International Conference on Serpentine Ecology (Part 1)

 
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Global research on ultramafic (serpentine) ecosystems (8th International Conference on Serpentine Ecology in Sabah, Malaysia): a summary and synthesis 
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Antony van der Ent, Nishanta Rajakaruna, Robert Boyd, Guillaume Echevarria, Rimi Repin and Dick Williams
pp. 1-16

The 8th ICSE was hosted by Sabah Parks in Malaysia attracted 174 participants from 31 countries and was the first held in Asia, the region that hosts some of the world’s most biodiverse ultramafic ecosystems. Here we summarise some of the contributions made during the 8th ICSE and describe some of the exciting challenges awaiting future research.

 
 

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Nickel accumulation by Alyssum serpyllifolium subsp. lusitanicum (Brassicaceae) from serpentine soils of Bragança and Morais (Portugal) ultramafic massifs: plant–soil relationships and prospects for phytomining 
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I. Morais, J. S. Campos, P. J. C. Favas, J. Pratas, F. Pita and M. N. V. Prasad
pp. 17-30

Serpentine soils derived from ultramafic rocks have a worldwide distribution. They are rich in Ni, Cr and sometimes Co, but are poor in essential nutrients, such as N, P, K and Ca. Many plants that hyperaccumulate Ni are endemic to serpentine soils. The rhizosphere of these endemic plants provides a complex and dynamic microenvironment where the roots of hyperaccumulator plants, along with associated microbes, form a unique ecosystem with an extraordinary phytoextraction function. This study examines the potential for phytomining Ni using Alyssum serpyllifolium from serpentine soils in north-eastern Portugal.

 
  
 

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Stenocalcic properties in the serpentine-endemic plant Alyssum inflatum Nyárády 
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Rasoul Ghasemi, Zohreh Zare Chavoshi and Seyed Majid Ghaderian
pp. 31-38

Some of the survival-related physiological responses to different concentrations of Ca were compared to test Ca sensitivity in Alyssum inflatum (serpentine endemic) and A. lanceolatum (non-serpentine plant). On the basis of the observed responses, we introduce the serpentine plant A. inflatum as a stenocalcic plant. The results demonstrated the reason behind the uneven distribution of the plant on serpentine patches in its habitat.

 
  
 

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Calcium : magnesium ratio affects environmental stress sensitivity in the serpentine-endemic Alyssum inflatum (Brassicaceae) 
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Rasoul Ghasemi, Zohreh Zare Chavoshi, Robert S. Boyd and Nishanta Rajakaruna
pp. 39-46

We compared survival of a serpentine and a non-serpentine soil Alyssum species when exposed to variation in Ca : Mg ratio and ammonium and heat stress. The serpentine soil species was less tolerant of change in Ca : Mg ratio and also was more sensitive to both ammonium and heat stress. We conclude that the serpentine soil species may be more susceptible to anthropogenic environmental changes.

 
  
 

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Interaction of nickel and manganese in uptake, translocation and accumulation by the nickel-hyperaccumulator plant, Alyssum bracteatum (Brassicaceae) 
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S. Majid Ghaderian, Rasoul Ghasemi and Faeze Hajihashemi
pp. 47-55

Interactions of Ni with different metals may affect Ni uptake and accumulation by the Ni-hyperaccumulator, Alyssum bracteatum. Negative correlations were observed between Ni and Mn concentrations in both roots and shoots. The results suggest a competition between Ni and Mn for uptake at root.

 
  
 

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Nickel stimulates copper uptake by nickel-hyperaccumulator plants in the genus Alyssum 
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Rasoul Ghasemi, S. Majid Ghaderian and Sahar Ebrazeh
pp. 56-64

The specificity of some traits that are responsible for metal tolerance in metal hyperaccumulator plants could be clarified by studying the interactions of different metals. Studying the interactions of Ni and Cu in some Ni hyperaccumulator and non-accumulator plants from the genus Alyssum showed an specific stimulation of Cu uptake by Ni in Ni-accumulator plants. This finding hints that this particular feature may be among the characteristics that enable them to hyperaccumulate Ni, unlike their congeneric non-accumulators.

 
  
 

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Effects of Ni on superoxide dismutase and glutathione reductase activities and thiol groups: a comparative study between Alyssum hyperaccumulator and non-accumulator species 
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S. Majid Ghaderian, Rasoul Ghasemi, Hosniye Heidari and Saiede Vazirifar
pp. 65-71

Effects of Ni on some of antioxidant activities in different Alyssum Ni hyperaccumulator and non-accumulators were investigated. The results showed that in hyperaccumulators, superoxide dismutase activity was decreased by Ni while glutathione reductase activity was increased. It is concluded that the accumulation of Ni could negatively affect some vital physiological processes.

 
  
 

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The effect of plant density in nickel-phytomining field experiments with Alyssum murale in Albania 
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Aida Bani, Guillaume Echevarria, Xin Zhang, Emile Benizri, Baptiste Laubie, Jean Louis Morel and Marie-Odile Simonnot
pp. 72-77

The effect of the density of Alyssum murale for phytomining was studied at field scale. At Domosdovë, at densities of one and six plants per square metre, and at Pojskë, of four plants per square metre, the biomass yield was 10, 5 and 10 t ha–1, respectively. The mass of phytoextracted nickel was 77, 41 and 112 kg ha–1. We suggest that a density of four plants per square metre is suitable for phytoextraction with native populations of A. murale.

 
  
 

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Nickel accumulation by species of Alyssum and Noccaea (Brassicaceae) from ultramafic soils in the Urals, Russia 
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Anzhelika Yu. Teptina and Alexander G. Paukov
pp. 78-84

Cool temperate regions have fewer species that are able to hyperaccumulate nickel than tropical and subtropical areas, possibly because of the limited time that has elapsed since the last major glaciation. Our study focussed on discovering nickel accumulator or hyperaccumulator species on serpentines in the Middle and Southern Urals of Russia. Alyssum tortuosum appeared to be a nickel hyperaccumulator; however, populations differed in their ability to accumulate the metal. A more detailed study of populations is necessary to understand nickel hyperaccumulation potential in this taxon.

 
  
 

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Nickel hyperaccumulation in populations of Psychotria grandis (Rubiaceae) from serpentine and non-serpentine soils of Puerto Rico 
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Rachel L. McAlister, Duane A. Kolterman and A. Joseph Pollard
pp. 85-91

Hyperaccumulators store high concentrations of heavy metals in their leaves, and may have applications in biotechnology for plant-based mining and environmental remediation. We studied a tropical hyperaccumulator, Psychotria grandis, which grows on both normal and geologically nickel-enriched soils, and found that although the amount of nickel in its leaves varies widely, plants from both soil types have similar physiological ability to accumulate nickel. Most of the world’s hyperaccumulators occur in the tropics, but few previous studies have investigated tropical plants.

 
  
 

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Phytoextraction of nickel and rhizosphere microbial communities under mono- or multispecies hyperaccumulator plant cover in a serpentine soil 
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Marie Rue, Jessica Vallance, Guillaume Echevarria, Patrice Rey and Emile Benizri
pp. 92-102

This study is one of a few works concerned with the effect of the association of hyperaccumulator plants on the efficiency of nickel phytoextraction. The objective was to compare the mono- and co-cropping of hyperaccumulator plant species. Two hyperaccumulator plants were the best candidates for improved phytoextraction efficiency. This work underlined that multi-species vegetation covers promote the development and activity of rhizosphere microorganisms and could improve phytoextraction.

 
  
 

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Nickel-hyperaccumulating species of Phyllanthus (Phyllanthaceae) from the Philippines 
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Marilyn O. Quimado, Edwino S. Fernando, Lorele C. Trinidad and Augustine Doronila
pp. 103-110

The genus Phyllanthus has at least 42 species from various parts of the world reported to accumulate more than 0.1% nickel in their leaves. This paper compared nickel accumulation in seven species of Phyllanthus from the Philippines and reports Phyllanthus erythrotrichus as a hypernickelophore, accumulating more than 1% nickel in the leaves. Three of the species examined have potential in nickel farming.

 
  
 

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Heavy metal uptake by chemically distinct lichens from Aspicilia spp. growing on ultramafic rocks 
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A. G. Paukov, A. Yu. Teptina and E. V. Pushkarev
pp. 111-118

Lichens usually contain ‘lichen acids’, many of which have a significant affinity for heavy metals. These substances may play a key role in detoxification, acting as selective chelators of metals. For three lichen species we tested, there was no significant difference in metal concentration; however, another species that contained norstictic acid had higher concentrations of elements. Further investigations may show the reasons for such high levels of metal accumulation and the possible implication of lichen metabolites in metal tolerance.

 
  
 

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Erratic hyperaccumulation of nickel, with particular reference to the Queensland serpentine endemic Pimelea leptospermoides 
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Roger D. Reeves, W. Scott Laidlaw, Augustine Doronila, Alan J. M. Baker and (the late) George N. Batianoff
pp. 119-127

Among more than 400 nickel-hyperaccumulating plants known worldwide, the Queensland endemic Pimelea leptospermoides is unusual in showing a very wide range of nickel concentrations from high-nickel ultramafic soils. This work aims to determine whether the variations result from differences among the various plant populations or from different properties of the soils on which they grow; it shows that a combination of variations in soil pH and total soil Ni concentration account for the observed differences in plant behaviour. Other cases of wide differences in nickel uptake by species at different sites may also be explained in this way, and the detailed investigation of soil properties should accompany studies on the nickel-accumulating behaviour of these plants.

 
  
 

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Growth and nickel uptake by serpentine and non-serpentine populations of Fimbristylis ovata (Cyperaceae) from Sri Lanka 
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P. K. D. Chathuranga, S. K. A. T. Dharmasena, N. Rajakaruna and M. C. M. Iqbal
pp. 128-133

We conducted a study to examine whether serpentine and non-serpentine populations of Fimbristylis ovata represent locally adapted ecotypes by investigating their growth and potential for nickel uptake and tolerance under greenhouse conditions. The serpentine population showed significantly better growth and nickel tolerance than did the non-serpentine population. Our preliminary investigations suggest that the serpentine and non-serpentine populations may be locally adapted to their respective soils; however, additional studies are required to determine whether the populations deserve ecotypic recognition.

 
  
 

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Metal accumulation by Arabidopsis halleri subsp. gemmifera at a limestone mining site 
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Aki Kosugi, Jun Tamaru, Kazumi Gotou, Hazuka Y. Furihata, Akifumi Shimizu, Akira Kawabe and Emiko Harada
pp. 134-140

Arabidopsis halleri is a model Cd and Zn hyperaccumulator. Accessions of A. halleri subsp. gemmifera growing on calcareous soil contained high amounts of Cd in shoots, but Zn concentration in shoots did not reach the level required for a hyperaccumulator. Soil factors and natural variations of A. halleri may help us understand the plant mechanisms of metal accumulation and tolerance.

 
  
 

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Interspecific competition between a non-native metal-hyperaccumulating plant (Noccaea caerulescens, Brassicaceae) and a native congener across a soil-metal gradient 
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Judy P. Che-Castaldo and David W. Inouye
pp. 141-151

Certain plants have the extraordinary ability to take up high concentrations of heavy metals, but evolutionary theory predicts that this ability should impair other plant functions. This study asked whether one such affected function is the ability to compete against other species. Although our results did not support this trade-off, further studies on uncontaminated soils and with other competing species are warranted. Our results also suggested that the use of non-native plants to remediate metal-contaminated sites should require careful monitoring.

 
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Essential and toxic element concentrations in Hypericum perforatum 
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Dolja Pavlova, Irina Karadjova and Ilina Krasteva
pp. 152-158

Toxic and essential elements were determined in plant aerial parts as well as in plant methanol/water and water extracts prepared from the herb Hypericum perforatum growing on and off serpentine soils. Results showed that the plant is Ni tolerant, but can accumulate trace elements at toxic levels. People should be careful when collecting herb from serpentine and using for medication.

 
  
 

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Biomass and metal yield of co-cropped Alyssum murale and Lupinus albus 
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Cheng-Ai Jiang, Qi-Tang Wu, Romain Goudon, Guillaume Echevarria and Jean-Louis Morel
pp. 159-166

Combining crops is a potential option to gain value from poor ultramafic soils cultivated for agromining. Co-cropping the Ni-hyperaccumulator Alyssum murale and Lupinus albus under controlled conditions showed a positive effect of P fertilisation on Ni uptake but a reduction in Ni concentration in A. murale, while L. albus accumulated high rates of Mn. Such association would increase productivity of serpentine soils provided appropriate P fertilisation in supplied.

 
  
 

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Seasonal changes in photosynthetic rate and pigment content in two populations of the monotypic Balkan serpentine endemic Halacsya sendtneri 
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Dražen D. Vicić, Milovan M. Stoiljković, Marko S. Sabovljević and Branka M. Stevanović
pp. 167-171

Perennial herb Halacsya sendtneri grows exclusively in harsh serpentine soils of the Balkan Peninsula. It thrives in both open and shaded habitats. Colonising a wider range of habitats with different levels of sunlight enables it to more efficiently solve harsh soil features, and vice versa.

 
  
 

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These articles have been peer reviewed and accepted for publication. They are still in production and have not been edited, so may differ from the final published form.

    BT15018  Accepted 20 May 2015
    Knowledge of the reproductive ecology of the invasive Salix cinerea, in its invaded range, assists in more targeted management strategies.
    Tara Hopley, Andrew Young
    Abstract


    BT14310  Accepted 21 May 2015
    Conservation biology of two endemic Beyeria species (Euphorbiaceae) from southern Western Australia
    Brian Vincent, Sarah Barrett, Jennifer Cochrane, Michael Renton, Julie Plummer
    Abstract


    BT14271  Accepted 18 May 2015
    Chrysopogon zizanioides (vetiver grass) as a Potential Plant for Landslide Bioengineering at Atok, Benguet, Philippines
    Kryssa Balangcod, Freda Wong, Teodora Balangcod
    Abstract


    BT14243  Accepted 16 May 2015
    Mapping the vegetation of the ultramafic outcrops of Saddle Hills (North Andaman Islands, India) using remote sensing tools
    KRISHNA CHAUDHURY, Suman Dutta, Prasanta Mukherjee
    Abstract


    BT14320  Accepted 07 May 2015
    Vegetation of Beni Bousera (North Morocco) ultramafic soils and adjacent non-ultramafic soils in relation to edaphic factors
    abdeljalil EL GHALABZOURI, Redouan Ajbilou, Mauro Mariotti, Kamal Targuisti, Mohammed ATER
    Abstract


    BT14214  Accepted 26 January 2015
    Plant diversity and ecology of ultramafic outcrops in Sabah (Malaysia)
    Antony van der Ent, Rimi Repin, John Sugau, Khoon Meng Wong
    Abstract


6


The Most Read ranking is based on the number of downloads from the CSIRO PUBLISHING website of articles published in the previous 12 months. Usage statistics are updated daily.

Rank Paper Details
1. Published 16 October 2014
Diversity of exotic vascular plant species on Moreton Island in subtropical Australia: increase over 100 years

Jian Wang

2. Published 23 May 2014
Review of the phytogeography of Cape York Peninsula: a flora that illustrates the development of the Australian sclerophyll biota

Bruce Wannan

3. Published 8 July 2014
Acacia holosericea (Fabaceae) litter has allelopathic and physical effects on mission grass (Cenchrus pedicellatus and C. polystachios) (Poaceae) seedling establishment

Muhammad S. Quddus, Sean M. Bellairs and Penelope A. S. Wurm

4. Published 8 July 2014
Molecular genetic diversity and population structure in Eucalyptus pauciflora subsp. pauciflora (Myrtaceae) on the island of Tasmania

Archana Gauli, Dorothy A. Steane, René E. Vaillancourt and Brad M. Potts

5. Published 23 May 2014
Genetic diversity and biogeography of the boab Adansonia gregorii (Malvaceae: Bombacoideae)

Karen L. Bell, Haripriya Rangan, Rachael Fowler, Christian A. Kull, J. D. Pettigrew, Claudia E. Vickers and Daniel J. Murphy

6. Published 1 May 2014
Do habitat fragmentation and fire influence variation of plant species composition, structure and diversity within three regional ecosystems on the Sunshine Coast, Queensland, Australia?

Rohan Etherington and Alison Shapcott

7. Published 16 October 2014
Reproductive trajectories over decadal time-spans after fire for eight obligate-seeder shrub species in south-eastern Australia

Annette M. Muir, Peter A. Vesk and Graham Hepworth

8. Published 29 August 2014
Sustained impacts of a hiking trail on changing Windswept Feldmark vegetation in the Australian Alps

Mark Ballantyne, Catherine M. Pickering, Keith L. McDougall and Genevieve T. Wright

9. Published 16 October 2014
The influence of depth-to-groundwater on structure and productivity of Eucalyptus woodlands

Sepideh Zolfaghar, Randol Villalobos-Vega, James Cleverly, Melanie Zeppel, Rizwana Rumman and Derek Eamus

10. Published 29 August 2014
Do fire-related cues, including smoke-water, karrikinolide, glyceronitrile and nitrate, stimulate the germination of 17 Anigozanthos taxa and Blancoa canescens (Haemodoraceae)?

Katherine S. Downes, Marnie E. Light, Martin Pošta, Ladislav Kohout and Johannes van Staden

11. Published 1 May 2014
Low-phosphorus conditions affect the nitrogen nutrition and associated carbon costs of two legume tree species from a Mediterranean-type ecosystem

Anathi Magadlela, Aleysia Kleinert, Léanne L. Dreyer and Alex J. Valentine

12. Published 16 October 2014
Salt stress differently affects growth, water status and antioxidant enzyme activities in Solanum lycopersicum and its wild relative Solanum chilense

Juan Pablo Martínez, Alejandro Antúnez, Héctor Araya, Ricardo Pertuzé, Lida Fuentes, X. Carolina Lizana and Stanley Lutts

13. Published 23 May 2014
Unravelling the evolutionary history of Eucalyptus cordata (Myrtaceae) using molecular markers

Peter A. Harrison, Rebecca C. Jones, René E. Vaillancourt, Robert J. E. Wiltshire and Brad M. Potts

14. Published 29 August 2014
Where they are, why they are there, and where they are going: using niche models to assess impacts of disturbance on the distribution of three endemic rare subtropical rainforest trees of Macadamia (Proteaceae) species

M. Powell, A. Accad and A. Shapcott

15. Published 19 February 2015
Restoration of eucalypt grassy woodland: effects of experimental interventions on ground-layer vegetation

S. McIntyre, R. B. Cunningham, C. F. Donnelly and A. D. Manning

16. Published 16 October 2014
Demographic history and niche conservatism of tropical rainforest trees separated along an altitudinal gradient of a biogeographic barrier

Rohan Mellick, Peter D. Wilson and Maurizio Rossetto

17. Published 19 February 2015
Are shrubs really a sign of declining ecosystem function? Disentangling the myths and truths of woody encroachment in Australia

David J. Eldridge and Santiago Soliveres

18. Published 29 August 2014
Population structure, seed loads and flowering phenology in three common (Melaleuca styphelioides, M. thymifolia, M. nodosa) and one rare (M. deanei) Melaleuca (Myrtaceae) species of the Sydney region

Alison Hewitt, Paul Holford, Adrian Renshaw, Anthony Haigh and E. Charles Morris

19. Published 1 May 2014
Genetic control of flowering in spotted gum, Corymbia citriodora subsp. variegata and C. maculata

Myralyn Abasolo, David J. Lee, Lyndon Brooks, Carolyn Raymond and Mervyn Shepherd

20. Published 1 May 2014
Spatial and temporal variation in damage and dieback in a threatened subantarctic cushion species

J. Whinam, J. A. Abdul-Rahman, M. Visoiu, M.-B. F. di Folco and J. B. Kirkpatrick


      
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