Title: GC content, genome size and chromosome size evolution ingrasses and other monocots
Abstract: Compared to other angiosperms, grass genomes (Poaceae) highly
vary in base composition and have considerably higher GC
(guanine + cytosine) content. The base composition varies
generally with the content of various genome components, and
with direction of mutational pressure. Both processes may
relate to over 60-fold differences in genome and chromosome
sizes found in grasses, and to evolutionary success of grasses
in various extreme environments. Here we discuss evolutionary
consequences of genome size, chromosome size and GC content in
Eurasian species of Festuca genus, across subfamilies Pooideae,
Bambusoideae and Oryzoideae, and among various monocots
families. We show that in addition to conventional genome size
data the GC content may represent another usefull character in
taxa delimitation and in understanding the long-term processes
of genome evolution.
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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