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You searched for: Journal Australian journal of botany Remove constraint Journal: Australian journal of botany Publication Year 2011 Remove constraint Publication Year: 2011 Source 2011 v.59 no.3 Remove constraint Source: 2011 v.59 no.3
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1. Abiotic factors modulate phenotypic plasticity in an apomictic shrub [Miconia albicans (SW.) Triana] along a soil fertility gradient in a Neotropical savanna

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

2. Demographic structure, genetic diversity and habitat distribution of the endangered, Australian rainforest tree Macadamia jansenii help facilitate an introduction program

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

3. Diversification history and hybridisation of Dacrydium (Podocarpaceae) in remote Oceania

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

4. Evaluation of different methods for assessing the reproductive mode of weeping lovegrass plants, Eragrostis curvula (Schrad.) Nees

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

5. Identification of key environmental variables associated with the presence of Toothed Leionema (Leionema bilobum serrulatum) in the Strzelecki Ranges, Victoria, Australia

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

6. Life history and morphological variation in intraspecific seeder and resprouter populations of two species from rock outcrop vegetation in north-east New South Wales

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

7. Molecular genetic variation in a widespread forest tree species Eucalyptus obliqua (Myrtaceae) on the island of Tasmania

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

8. Ophiostoma species (Ophiostomatales, Ascomycota), including two new taxa on eucalypts in Australia

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

9. Origins of a morphological cline between Eucalyptus melanophloia and Eucalyptus whitei

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

10. Triploidy causes sexual infertility in Cyrtanthus breviflorus (Amaryllidaceae)

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