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- Author:
- Bedetti, Cibele S.; Aguiar, Débora B.; Jannuzzi, Maria C.; Moura, Maria Z.D.; Silveira, Fernando A.O.
- Source:
- Australian journal of botany 2011 v.59 no.3 pp. 274-282
- ISSN:
- 0067-1924
- Subject:
- dry season; grasslands; phenotypic plasticity; shrubs; Miconia; trichomes; leaf area; drought; habitats; multivariate analysis; savannas; soil fertility; woodlands; genetic variation; stomata; cerrado; coping strategies; Brazil
- Abstract:
- ... Phenotypic plasticity is an important means by which plants cope with environmental heterogeneity; therefore, understanding variation in plant traits in heterogeneous habitats is important to predict responses to changing environments. In this study, we examined the patterns of intraspecific variation in leaf traits of Miconia albicans (Melastomataceae), a widespread, obligatory apomictic shrub, a ...
- DOI:
- 10.1071/BT10275
-
http://dx.doi.org/10.1071/BT10275
- Author:
- Shapcott, Alison; Powell, Michael
- Source:
- Australian journal of botany 2011 v.59 no.3 pp. 215-225
- ISSN:
- 0067-1924
- Subject:
- Macadamia integrifolia; extinction; genetic techniques and protocols; genetic variation; models; niches; population size; rain forests; species diversity; streams; surveys; trees; viability; Queensland
- Abstract:
- ... Macadamia jansenii is endemic to south-east Queensland, Australia, and is currently known from a single population 180km north of the nearest wild population of its congener, the edible Macadamia integrifolia. A recently developed Macadamia recovery plan identified that this population was under significant threat and recommended a reintroduction program to safeguard against chance extinction of t ...
- DOI:
- 10.1071/BT10132
-
http://dx.doi.org/10.1071/BT10132
- Author:
- Keppel, Gunnar; Prentis, Peter; Biffin, Ed; Hodgskiss, Paul; Tuisese, Susana; Tuiwawa, Marika V.; Lowe, Andrew J.
- Source:
- Australian journal of botany 2011 v.59 no.3 pp. 262-273
- ISSN:
- 0067-1924
- Subject:
- Dacrydium; chloroplast DNA; endangered species; genetic variation; introgression; nucleotide sequences; species diversity; New Caledonia
- Abstract:
- ... We examined evolutionary relationships, hybridisation and genetic diversity in species of Dacrydium (Podocarpaceae) in Remote Oceania, where it is restricted to New Caledonia and Fiji. We used cpDNA sequence (trnL-trnF) data to construct a phylogeny and estimate taxon divergence by using a relaxed molecular clock approach. The phylogeny was verified using allozymes, which were also used to investi ...
- DOI:
- 10.1071/BT10181
-
http://dx.doi.org/10.1071/BT10181
- Author:
- Meier, Mauro; Zappacosta, Diego; Selva, Juan Pablo; Pessino, Silvina; Echenique, Viviana
- Source:
- Australian journal of botany 2011 v.59 no.3 pp. 253-261
- ISSN:
- 0067-1924
- Subject:
- DNA; Eragrostis curvula; aniline; apomixis; callose; flow cytometry; forage grasses; genetic markers; genotype; megasporocytes; meiosis; progeny; progeny testing; seeds; semiarid zones
- Abstract:
- ... Weeping lovegrass is a forage grass cultivated in semiarid regions of the world that reproduces mainly by apomixis (diplospory), a process that involves the formation of asexual seeds and bypasses the processes of meiosis and fertilisation. The aim of this work was to evaluate and compare different techniques (cytoembryology, callose deposition, flow cytometry and progeny tests) to determine the r ...
- DOI:
- 10.1071/BT10267
-
http://dx.doi.org/10.1071/BT10267
- Author:
- Wright, Wendy; Zhu, Xuan; Okurowski, Mateusz
- Source:
- Australian journal of botany 2011 v.59 no.3 pp. 207-214
- ISSN:
- 0067-1924
- Subject:
- Rutaceae; altitude; geographic information systems; habitats; models; phytogeography; plantations; shrubs; topographic aspect; trees; Victoria (Australia)
- Abstract:
- ... Toothed Leionema is one of four subspecies of Leionema bilobum from the Rutaceae family. A dense shrub or small tree, growing to ~4m high, it is a poorly investigated species which is considered rare in Victoria, Australia. This paper presents the results of a study using Geographical Information Systems and Weights-of-Evidence predictive modelling to assess the importance of seven environmental f ...
- DOI:
- 10.1071/BT10197
-
http://dx.doi.org/10.1071/BT10197
- Author:
- Benwell, Andrew; McCorkell, Bruce
- Source:
- Australian journal of botany 2011 v.59 no.3 pp. 197-206
- ISSN:
- 0067-1924
- Subject:
- grasses; life history; linear models; resource allocation; seeds; shrublands; ecotypes; experimental design; fertilizer rates; rocks; asexual reproduction; shrubs; flowers; fire regime; vegetative growth; woodlands; Entolasia; habitats; shoots; New South Wales
- Abstract:
- ... The processes underlying differentiation of seeder and resprouter life histories were explored by studying changes in life history and morphological traits in intraspecific seeder and resprouter populations of the grass Entolasia stricta and shrub Keraudrenia hillii var. hillii from adjoining rock pavement and fringing woodland habitats. Population traits were sampled in the field and studied unde ...
- DOI:
- 10.1071/BT07084
-
http://dx.doi.org/10.1071/BT07084
- Author:
- Bloomfield, Justin A.; Nevill, Paul; Potts, Brad M.; Vaillancourt, René E.; Steane, Dorothy A.
- Source:
- Australian journal of botany 2011 v.59 no.3 pp. 226-237
- ISSN:
- 0067-1924
- Subject:
- Eucalyptus obliqua; forest trees; gene flow; genetic variation; haplotypes; inbreeding coefficient; islands; microsatellite repeats; natural selection; pollen; quantitative traits; sclerophyll forests; silvicultural practices; Tasmania
- Abstract:
- ... Eucalyptus obliqua L'Hér. is widespread across south-eastern Australia. On the island of Tasmania it has a more-or-less continuous distribution across its range and it dominates much of the wet sclerophyll forest managed for forestry purposes. To understand better the distribution of genetic variation in these native forests we examined nuclear microsatellite diversity in 432 mature individuals f ...
- DOI:
- 10.1071/BT10315
-
http://dx.doi.org/10.1071/BT10315
- Author:
- Nkuekam, G. Kamgan; Wilhelm de Beer, Z.; Wingfield, Michael J.; Mohammed, Caroline; Carnegie, Angus J.; Pegg, Geoff S.; Roux, Jolanda
- Source:
- Australian journal of botany 2011 v.59 no.3 pp. 283-297
- ISSN:
- 0067-1924
- Subject:
- Eucalyptus; Ophiostoma; Quercus; bark; fungi; indigenous species; new taxa; pathogenicity; pathogens; trees; xylem; Tasmania
- Abstract:
- ... The genus Ophiostoma accommodates ascomycetes in the order Ophiostomatales, some of which are important pathogens of trees. Although these fungi are well known in the northern hemisphere, very little is known regarding their occurrence or importance in Australia. The aim of the present study was to collect Ophiostoma spp. infecting wounds on Eucalyptus spp. in Australia, where most of these trees ...
- DOI:
- 10.1071/BT10231
-
http://dx.doi.org/10.1071/BT10231
- Author:
- Holman, James E.; Hughes, Jane M.; Fensham, Roderick J.
- Source:
- Australian journal of botany 2011 v.59 no.3 pp. 244-252
- ISSN:
- 0067-1924
- Subject:
- Eucalyptus; chloroplast DNA; gene flow; haplotypes; leaves; microsatellite repeats; nuclear genome; phenotypic variation; phylogeny; rain; secondary contact; seedlings
- Abstract:
- ... Most theories to explain the origin and maintenance of clines in Eucalyptus are based on a morphological classification system. The true relationships between putative species along clines require detailed investigation of phylogenetic relationships. A cline between Eucalyptus melanophloia and E. whitei was examined using morphological and molecular analyses to determine whether genetic structurin ...
- DOI:
- 10.1071/BT10209
-
http://dx.doi.org/10.1071/BT10209
- Author:
- Ramsey, Mike; Vaughton, Glenda; Ascough, Glendon D.; Johnson, Steven D.
- Source:
- Australian journal of botany 2011 v.59 no.3 pp. 238-243
- ISSN:
- 0067-1924
- Subject:
- Cyrtanthus; asexual reproduction; flow cytometry; fruit set; fruits; ovules; pollen; pollination; pollinators; sexual reproduction; stigma; triploidy
- Abstract:
- ... The balance between sexual and asexual reproduction can vary markedly in clonal plants. At one extreme, plants are sexually infertile and reproduction is solely clonal. Infertility can be caused by environmental and/or genetic factors, but the role of each is often unknown. Here we determine variation in sexual reproduction and explore the underlying factors causing sexual infertility in Cyrtanthu ...
- DOI:
- 10.1071/BT10272
-
http://dx.doi.org/10.1071/BT10272