This paper considers how far natural stands of eucalypt species are likely to be able to disperse in the period to 2085. Although rare long-distance events cannot be ruled out, the most likely dispersal distances are about 70–140 m. However, limitations such as inadequate remnant stands and extensive agricultural developments may reduce actual migration rates below even this modest potential.
Australian Journal of Botany
Volume 65 Number 5 2017
BT16257Influence of auxin and phenolic accumulation on the patterns of cell differentiation in distinct gall morphotypes on Piptadenia gonoacantha (Fabaceae)
The accumulation of IAA–phenolics was compartmentalised on the basis of gall morphotypes on Piptadenia gonoacantha. The sites of accumulation coincided with the most hypertrophied regions, i.e., the cells of superior and lateral inferior cortices in the lenticular galls, and throughout the outer cortex in the globoid galls, which influenced on the determination of the lenticular and globoid shapes.
The thermal activity of Macrozamia macleayi Miq. (family Zamiaceae) pollen cones changes with developmental stage in a manner similar to Cycas micronesica K.D. Hill (family Cycadaceae) pollen cones, suggesting a conserved physiological response across cycad families. The Macrozamia macleayi cones use carbohydrates, but not lipids, to fuel their large dehiscence stage thermogenic events, during which evaporation rates increase considerably.
BT16231Relationship between nitrogen resorption and leaf size in the aroid vine Rhodospatha oblongata (Araceae)
Although leaves of Rhodospatha oblongata increased 35 times in area and 50% in vein density, the N concentration was always around 2–3% in green leaves and 1–2% in senescent leaves. Consequently, increase in vein density or in the amount of leaf N content were not the main constraining factors to leaf nitrogen resorption.
The capacity of Acacia harpophylla (brigalow) to resprout on cleared land is well documented, but its ability to recruit new individuals sexually is poorly understood because such reproduction events are rare. This study, undertaken following widespread flowering in late 2007, recorded very high initial densities of germinated seedlings (46 000 seedlings ha–1 on average), but less than 1% were estimated to survive the first year. Given the dramatic over-clearing of brigalow, such ecological knowledge is crucial for managing remaining populations.
BT17054Nickel effect on root-meristem cell division in Plantago lanceolata (Plantaginaceae) seedlings
Plantago lanceolata is a variable species growing on different soils but is not abundant on serpentines. Nickel effect on root-cell division is the reason for the low percentage of divided cells, high percentage of abnormalities, and variation of karyotype morphology. Unsuccessful distribution of the species on serpentine soils is related to its poor adaptation to stress conditions provided by the elevated metal concentrations in the soils.
BT17089Aeluropus littoralis maintains adequate gas exchange, pigment composition and phenolic contents under combined effects of salinity and phosphorus deficiency
The ability of Aeluropus littoralis to cope with both phosphorus (P) deficiency and high salt stresses is a result of several mechanisms mainly involved in the conservation of the integrity of the photosynthetic apparatus. Secondary metabolites – mainly phenolic compounds and carotenoids – play an important role in the protection of A. littoralis plants against oxidative damage under combined high salinity and P deficiency stresses.
BT16252Adaptive strategy of tree communities on an environmental harshness hinterland inselberg in Minas Gerais, Brazil
Our research tested the hypotheses that environmental harshness enhances sprouting, a trait displayed by trees as an adaptive strategy to habitat persistence. Over the 5 years of the study, sprouting proved to be a strategy of persistence. Multi-stemmed trees have different dynamics compared to single-stemmed trees. Factors such as soil depth, may be the cause of sprouting in trees.
BT17043Regarding the structure and possible function of the columella in seed cones of Callitroideae (Cupressaceae): a morpho-anatomical approach
Several callitroid Cupressaceae have a column-like structure – termed ‘columella’ – that are developed distally in the seed cones, which exclusively represents the prolonged tip of the cone axis. Thus, the distal three-part structure of Fitzroya represents a sterile whorl of cone scales that should not be termed columella. It is suggested that columellae that exceed the ovules, play a role in the pollination process, whereas prolonged, resinous columellae play a role in the chemical defence against pathogens.
The peer-reviewed and edited version of record published online before inclusion in an issue
BT17068Seed viability of early maturing alpine ash (Eucalyptus delegatensis subsp. delegatensis) in the Australian Alps, south-eastern Australia, and its implications for management under changing fire regimes
Eucalyptus delegatensis R.T. Baker subsp. delegatensis is an interval-sensitive, fire-killed eucalypt found in the Australian Alps. Flowering and fruiting in stands of saplings regenerating after the 2003 fires is occurring much earlier than previously thought. Seed from such early maturing alpine is viable, with a mean of 455 (s.d. = 139) germinants per 10 g of chaff and seed mix.
BT16239Morphoanatomical characteristics of leaves of Anacardium othonianum seedlings subjected to different nitrogen doses under hydroponic conditions
Nitrogen is an essential nutrient for plant metabolic processes, so nutritional conditions can affect leaves and plant survival. A study of the effects of N on the foliar morphoanatomy of Anacardium othonianum showed that absence and excess of this nutrient affect leaf structure, as well as the synthesis of compounds of the metabolism. This work contributes to biological knowledge this species and to the growth of healthier seedlings.
BT17045Flower development in species of Croton (Euphorbiaceae) and its implications for floral morphological diversity in the genus
Flowers and inflorescences are extremely diverse and some of them show structures that are difficult to interpret, which led us to ask: how are these flowers built? Inside the family of castor beans, Euphorbiaceae, a large group, Croton, shows small flowers containing some structures that are alternatively considered as petals, glands or simple filaments. Studying the development of these flowers reveals the origin of the floral parts and their real identity, taking us closer to decipher flower diversity.’
BT16233Effects of selective thinning and residue removal on ground layer structure and diversity in a mixed pine–oak stand of the Qinling Mountains, China
Understorey is a key component of a forest ecosystem. Forest thinning may change the structure, diversity and cover of the understorey by reducing tree density and increasing gaps in the forest canopy. To achieve the highest richness, evenness and cover, a combination of selective thinning intensity and residue removal rate were suggested by applying a central composite design.
BT17114The importance of travelling stock reserves for maintaining high-quality threatened temperate woodlands
Travelling stock reserves (TSRs) are critically important for the conservation of temperate woodland communities that have otherwise been extensively cleared and degraded for agriculture. We compared the vegetation attributes of TSRs with remnants managed for agricultural production and found the former supported higher native plant species richness, more native ground cover and fewer exotic plants. Our results indicate that land tenure status of remnant woodlands generally influenced several vegetation attributes that are also important for native biodiversity.
This work reports on the occurrence of natural hybridisation between three sympatric orchid species. The reproduction of the species was recorded based on morpho-anatomical, histochemical analyses and intra- and interspecific crosses. The relationship between co-occurring species was verified by floral morphometry and principal component analysis, and sequence divergence analyses. All data collected suggest that no gene flow is currently occurring, and that hybridisation has been avoided due to the incompatible pollinarium size between the sympatric species, which acts as a pre-mating barrier in the studied population.
BT17036Seed dormancy and germination of three grassy woodland forbs required for diverse restoration
Restoration is vital for the re-establishment of degraded communities, but success is often hindered by issues related to seed biology. We examined dormancy-alleviation and germination-promotion techniques for three common grassy woodland forbs required for diverse restoration. Scarification of the seed produced the highest germination for Dianella longifolia and Stackhousia monogyna, whereas germination of Dianella revoluta requires further examination. This information can advance methods to propagate these species from seed and contribute to greater understorey diversity in grassy woodland restoration.
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.
Insect herbivory on Snow Gum (Eucalyptus pauciflora, Myrtaceae) saplings near the alpine treeline: the influence of local- and landscape-scale processes
Can the mother plant age of Acacia melanoxylon R. Br. (Leguminosae) modulate the germinative response to fire?
Nutritional and physiological responses of the dicotyledonous halophyte Sarcocornia fruticosa L. to salinity
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The importance of travelling stock reserves for maintaining high-quality threatened temperate woodlandsAustralian Journal of Botany (Online Early)Thea O'Loughlin, Luke S. O'Loughlin, Damian R. Michael, Jeffrey T. Wood, Helen P. Waudby, Phillip Falcke, David B. Lindenmayer
Are we underestimating the impact of rising summer temperatures on dormancy loss in hard-seeded species?Australian Journal of Botany 65 (3)Anne Cochrane
Australian Journal of Botany 65 (5)John M. Dwyer
Australian Journal of Botany 65 (4)Saskia Grootemaat, Ian J. Wright, Peter M. van Bodegom, Johannes H. C. Cornelissen, Veronica Shaw
Australian Journal of Botany 65 (4)J. M. Harvey, A. J. M. Hopkins, M. A. Langley, C. R. Gosper, M. R. Williams, C. J. Yates
Regarding the structure and possible function of the columella in seed cones of Callitroideae (Cupressaceae): a morpho-anatomical approachAustralian Journal of Botany 65 (5)Veit Martin Dörken, Armin Jagel
A framework for testing the influence of Aboriginal burning on grassy ecosystems in lowland, mesic south–eastern AustraliaAustralian Journal of Botany 64 (8)Paul W. Foreman
Relationship between nitrogen resorption and leaf size in the aroid vine Rhodospatha oblongata (Araceae)Australian Journal of Botany 65 (5)André Mantovani, Dulce Mantuano, Eduardo Arcoverde de Mattos
Australian Journal of Botany 65 (5)R. B. Roemer, D. Booth, L. I. Terry, G. H. Walter
Germination ecology of six species of Eucalyptus in shrink–swell vertosols: moisture, seed depth and seed size limit seedling emergenceAustralian Journal of Botany 65 (1)Lorena Ruiz Talonia, Nick Reid, Caroline L. Gross, R. D. B. Whalley
Influence of auxin and phenolic accumulation on the patterns of cell differentiation in distinct gall morphotypes on Piptadenia gonoacantha (Fabaceae)Australian Journal of Botany 65 (5)Cibele Souza Bedetti, Gracielle Pereira Bragança, Rosy Mary dos Santos Isaias
Australian Journal of Botany (Online Early)Gabrielle S. Vening, Lydia K. Guja, Peter G. Spooner, Jodi N. Price
Germination ecology of the endangered species Asterolasia buxifolia (Rutaceae): smoke response depends on season and lightAustralian Journal of Botany 65 (3)Justin C. Collette, Mark K. J. Ooi
Australian Journal of Botany 65 (4)Rosanne Quinnell, Daniel Howell, Raymond J. Ritchie
Subtropical native grasslands may not require fire, mowing or grazing to maintain native-plant diversityAustralian Journal of Botany 65 (2)Roderick J. Fensham, Donald W. Butler, Boris Laffineur, Harry J. MacDermott, John W. Morgan, Jennifer L. Silcock
Australian Journal of Botany 64 (8)Robert S. Hill, Yelarney K. Beer, Kathryn E. Hill, Elizabeth Maciunas, Myall A. Tarran, Carmine C. Wainman
Designing food and habitat trees for urban koalas: identifying short ecotypes of Corymbia intermediaAustralian Journal of Botany 65 (4)Stephen J. Trueman, Tracey V. McMahon, Elektra L. Grant, David A. Walton, Brittany B. Elliott, Helen M. Wallace
Effects of selective thinning and residue removal on ground layer structure and diversity in a mixed pine–oak stand of the Qinling Mountains, ChinaAustralian Journal of Botany (Online Early)Lin Hou, Shan Sun, Liyan Liang, Ge Liang, Luxi Jiang
Adaptive and diagnostic significance of the bark of Stryphnodendron polyphyllum (Leguminosae) from the CerradoAustralian Journal of Botany 65 (2)Paula C. B. Vergílio, Carmen R. Marcati
Australian Journal of Botany 65 (2)Klaus Winter, Joseph A. M. Holtum