Evolution of genome size in the angiosperms
نویسندگان
چکیده
منابع مشابه
Towards angiosperms genome evolution in time
In this communication, direction of evolutionary variability of parameters of genome size and structurally functional activity of plants in angiosperm taxa among life forms, are analyzed. It is shown that, in the Cretaceous–Cenozoic era, the nuclear genome of the plants tended to increase. Functional genome efficiency (intensity of functions per pg of DNA) decreased as much as possible from hig...
متن کاملEvaluating the role of genome downsizing and size thresholds from genome size distributions in angiosperms.
PREMISE OF THE STUDY Whole-genome duplications (WGDs) can rapidly increase genome size in angiosperms. Yet their mean genome size is not correlated with ploidy. We compared three hypotheses to explain the constancy of genome size means across ploidies. The genome downsizing hypothesis suggests that genome size will decrease by a given percentage after a WGD. The genome size threshold hypothesis...
متن کاملSize is not everything: rates of genome size evolution, not C-value, correlate with speciation in angiosperms
Angiosperms represent one of the key examples of evolutionary success, and their diversity dwarfs other land plants; this success has been linked, in part, to genome size and phenomena such as whole genome duplication events. However, while angiosperms exhibit a remarkable breadth of genome size, evidence linking overall genome size to diversity is equivocal, at best. Here, we show that the rat...
متن کاملEvolution of genome size and chromosome number in the carnivorous plant genus Genlisea (Lentibulariaceae), with a new estimate of the minimum genome size in angiosperms.
BACKGROUND AND AIMS Some species of Genlisea possess ultrasmall nuclear genomes, the smallest known among angiosperms, and some have been found to have chromosomes of diminutive size, which may explain why chromosome numbers and karyotypes are not known for the majority of species of the genus. However, other members of the genus do not possess ultrasmall genomes, nor do most taxa studied in re...
متن کاملformation and evolution of regional organizations: the case study of the economic cooperation organization (eco)
abstract because of the many geopolitical, geo economical and geo strategically potentials and communicational capabilities of eco region, members can expand the convergence and the integration in base of this organization that have important impact on members development and expanding peace in international and regional level. based on quality analyzing of library findings and experts interv...
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ژورنال
عنوان ژورنال: American Journal of Botany
سال: 2003
ISSN: 0002-9122,1537-2197
DOI: 10.3732/ajb.90.11.1596