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
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.
Flower development in species of Croton (Euphorbiaceae) and its implications for floral morphological diversity in the genus
Morphoanatomical characteristics of leaves of Anacardium othonianum Rizz. seedlings subjected to different nitrogen doses under hydroponic conditions
Seed viability of early maturing alpine ash (Eucalyptus delegatensis R.T. Baker subsp. delegatensis) in the Australian Alps, southeastern Australia, and its implications for management under changing fire regimes
The Most Read ranking is based on the number of downloads in the last 60 days from papers published on the CSIRO PUBLISHING website within the last 12 months. Usage statistics are updated daily.
Australian Journal of Botany 65 (4)Saskia Grootemaat, Ian J. Wright, Peter M. van Bodegom, Johannes H. C. Cornelissen, Veronica Shaw
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 (4)J. M. Harvey, A. J. M. Hopkins, M. A. Langley, C. R. Gosper, M. R. Williams, C. J. Yates
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
Australian Journal of Botany 65 (5)John M. Dwyer
High outcrossing rates and short-distance pollination in a species restricted to granitic inselbergsAustralian Journal of Botany 65 (4)Karina Vanessa Hmeljevski, Marina Wolowski, Rafaela Campostrini Forzza, Leandro Freitas
Floral morphology of Eucalyptus leucoxylon (Myrtaceae) facilitates pollination by lorikeet (Aves: Psittacidae) tonguesAustralian Journal of Botany 65 (4)Joseph P. Zilko, Susan E. Hoebee, Trevor J. Edwards
Inhibitory action of allelochemicals from Artemisia nanschanica to control Pedicularis kansuensis, an annual weed of alpine grasslandsAustralian Journal of Botany 65 (4)Zhanhuan Shang, Yuan Hou, Fei Li, Cancan Guo, Tianhua Jia, A. Allan Degen, Andrew White, Luming Ding, Ruijun Long
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
Australian Journal of Botany 65 (5)R. B. Roemer, D. Booth, L. I. Terry, G. H. Walter
Australian Journal of Botany 65 (4)Sebla Kabas, Felipe Saavedra-Mella, Trang Huynh, Peter M. Kopittke, Steve Carter, Longbin Huang
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
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 64 (8)Robert S. Hill, Gregory J. Jordan
Australian Journal of Botany 65 (2)Alex Arnold, Andrea Kodym, Nancy M. Endersby-Harshman, John Delpratt, Ary A. Hoffmann
Australian Journal of Botany 64 (8)Robert S. Hill, Yelarney K. Beer, Kathryn E. Hill, Elizabeth Maciunas, Myall A. Tarran, Carmine C. Wainman
Australian Journal of Botany 65 (2)Klaus Winter, Joseph A. M. Holtum
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)Trevor Olesen, David Robertson, Alister Janetzki, Tina Robertson
Australian Journal of Botany 65 (2)Heidi C. Zimmer, Singarayer K. Florentine, Rita Enke, Martin Westbrooke