Topic
Genus
About: Genus is a research topic. Over the lifetime, 68921 publications have been published within this topic receiving 590966 citations. The topic is also known as: monospecies genus & genus (zoology).
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01 Jan 2010TL;DR: Molecular and bioinfor- matic resources are actively being developed for multiple species of Populus, which makes this genus an excellent system for studying tree genetics and genomics.
Abstract: The genus Populus includes morphologically diverse species of decid- uous, relatively short-lived, and fast-growing trees. Most species have wide ranges of distribution but tend to occur primarily in riparian or mountainous habitats. Trees from this genus are typically dioecious, flower before leaf emer- gence, and produce large amounts of wind-dispersed pollen or seeds. Seedlings are drought- and shade-intolerant, and their establishment depends on distur- bance and high soil moisture. Asexual reproduction is common and occurs via root sprouting and/or rooting of shoots. Fossil records suggest that the genus appeared in the late Paleocene or early Eocene (i.e., 50-60 million years BP). According to one commonly used classification, the genus is comprised of 29 species divided into six sections, but a number of phylogenetic inconsistencies remain. Natural hybridization both within and among sections is extensive and is believed to have played a major role in the evolution of extant species of Populus. Both neutral molecular markers and adaptive traits reveal high levels of genetic variation within populations. Deviations from Hardy-Weinberg equi- librium are commonly detected in molecular marker studies. These deviations typically have small to moderate magnitudes and tend to be caused by heterozy- gote deficiency, indicating the possible existence of population substructure. Genetic differentiation among populations is much stronger for adaptive traits than for neutral markers, which suggests that divergent selection has played a dominant role in shaping patterns of adaptive genetic variation. Molecular and bioinfor- matic resources are actively being developed for multiple species of Populus, which makes this genus an excellent system for studying tree genetics and genomics.
71 citations
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TL;DR: It is unlikely that this genus experienced an extensive dispersal during the Messinian, in the Lago-Mare Phase, and a biogeographical model constructed on the basis of vicariant events seems more realistic than does a dispersalist model.
71 citations
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TL;DR: The Australian members of the genus Drosophila are reviewed, with redescriptions of many species; 40 new species are also described, bringing the known total to 81.
Abstract: The Australian members of the genus Drosophila are reviewed, with redescriptions of many species; 40 new species are also described, bringing the known total to 81. A key to species is provided. The Australian Drosophila fauna is dominated by members of the subgenus Scaptodrosophila, most of which appear to be endemic. The bulk of the Australian Drosophila fauna is substantially different from that of neighbouring New Guinea-south-east Asia, but the latter fauna overlaps into northern Queensland. The Australian fauna includes eight cosmopolitan species.
71 citations
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01 Jan 1973
71 citations