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Sci Rep ; 4: 4423, 2014 Apr 08.
Artigo em Inglês | MEDLINE | ID: mdl-24710346

RESUMO

Eragrostis curvula includes biotypes reproducing through obligate and facultative apomixis or, rarely, full sexuality. We previously generated a "tetraploid-dihaploid-tetraploid" series of plants consisting of a tetraploid apomictic plant (T), a sexual dihaploid plant (D) and a tetraploid artificial colchiploid (C). Initially, plant C was nearly 100% sexual. However, its capacity to form non-reduced embryo sacs dramatically increased over a four year period (2003-2007) to reach levels of 85-90%. Here, we confirmed high rates of apomixis in plant C, and used AFLPs and MSAPs to characterize the genetic and epigenetic variation observed in this plant in 2007 as compared to 2003. Of the polymorphic sequences, some had no coding potential whereas others were homologous to retrotransposons and/or protein-coding-like sequences. Our results suggest that in this particular plant system increased apomixis expression is concurrent with genetic and epigenetic modifications, possibly involving transposable elements.


Assuntos
Apomixia/genética , Epigênese Genética , Eragrostis/genética , Variação Genética , Poliploidia , Análise do Polimorfismo de Comprimento de Fragmentos Amplificados , Elementos de DNA Transponíveis , Regulação da Expressão Gênica de Plantas , Biblioteca Gênica , Genótipo , Polimorfismo Genético
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