Journal Article

Genome size and DNA base composition of geophytes: the mirror of phenology and ecology?

Pavel Veselý, Petr Bureš, Petr Šmarda and Tomáš Pavlíček

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 109, issue 1, pages 65-75
Published in print January 2012 | ISSN: 0305-7364
Published online October 2011 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcr267
Genome size and DNA base composition of geophytes: the mirror of phenology and ecology?

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  • Ecology and Conservation
  • Evolutionary Biology
  • Plant Sciences and Forestry

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Background and Aims

Genome size is known to affect various plant traits such as stomatal size, seed mass, and flower or shoot phenology. However, these associations are not well understood for species with very large genomes, which are laregly represented by geophytic plants. No detailed associations are known between DNA base composition and genome size or species ecology.

Methods

Genome sizes and GC contents were measured in 219 geophytes together with tentative morpho-anatomical and ecological traits.

Key Results

Increased genome size was associated with earliness of flowering and tendency to grow in humid conditions, and there was a positive correlation between an increase in stomatal size in species with extremely large genomes. Seed mass of geophytes was closely related to their ecology, but not to genomic parameters. Genomic DNA GC content showed a unimodal relationship with genome size but no relationship with species ecology.

Conclusions

Evolution of genome size in geophytes is closely related to their ecology and phenology and is also associated with remarkable changes in DNA base composition. Although geophytism together with producing larger cells appears to be an advantageous strategy for fast development of an organism in seasonal habitats, the drought sensitivity of large stomata may restrict the occurrence of geophytes with very large genomes to regions not subject to water stress.

Keywords: Life-form; geophytes; genome size evolution; GC content; phenology; stomatal length; seed mass; ecology

Journal Article.  8573 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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