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Evento

Apomixis expression in Eragrostis curvula under stress conditions

Zappacosta, Diego CarlosIcon ; Ochogavía, Ana ClaudiaIcon ; Romero, José RodolfoIcon ; Rodrigo, Juan ManuelIcon ; Meier, Mauro SebastiánIcon ; Polci, Pablo Aldo; Garbus, IngridIcon ; Pessino, Silvina ClaudiaIcon ; Echenique, Carmen VivianaIcon
Tipo del evento: Congreso
Nombre del evento: International Plant and Animal Genome XXII Conference
Fecha del evento: 10/01/2014
Institución Organizadora: Scherago International;
Título del Libro: Proceedings of Plant and Animal Genome XXII
Editorial: Scherago International
Idioma: Inglés
Clasificación temática:
Bioquímica y Biología Molecular

Resumen

Over the past few years our research group has been analyzing the molecular mechanisms involved in the reproductive control of weeping lovegrass (Eragrostis curvula [Schrad.] Nees), an apomictic perennial grass. This work was aimed at analyzing apomixis expressivity in Eragrostis curvula plants subjected to three stress conditions: 1) tissue culture followed by a colchicine-induced ploidy change; 2) tissue culture and 3) water deficit. In the first system, a colchicine-induced polyploid plant (C) changed the expressivity of apomixis in a four year period, being highly sexual shortly after polyploidization and highly apomictic four years later. During this interval, genetic and epigenetic changes were also observed. While genetic variation led to diversification with respect to an obligate apomictic control, epigenetic variation resulted in increased similarity. Polymorphic sequences were mainly similar to transposable elements and/or protein-coding-like sequences. In the second system, explants originated from near obligate apomictic plants were subjected to tissue culture. The expressivity of apomixis of a regenerated plant was analyzed immediately after treatment and nine years later. In this period, the levels of sexuality shifted from 45 to 0%. In the third model, near-obligate apomictic plants subjected to water stress showed an increase in expression of sexuality from 2 to 20%. As a whole, our results suggested that stress can temporarily activate sexuality in apomictic genotypes. At least in one system, this change was correlated with genetic and epigenetic modifications involving retroelements and/or protein-coding-like sequences.
Palabras clave: APOMIXIS , ERAGROSTIS CURVULA , STRESS CONDITIONS , EPIGENETICS
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/232082
URL: https://pag.confex.com/pag/xxii/webprogram/Paper10223.html
Colecciones
Eventos(CCT - ROSARIO)
Eventos de CTRO.CIENTIFICO TECNOL.CONICET - ROSARIO
Eventos(CERZOS)
Eventos de CENTRO REC.NAT.RENOVABLES DE ZONA SEMIARIDA(I)
Citación
Apomixis expression in Eragrostis curvula under stress conditions; International Plant and Animal Genome XXII Conference; San Diego; Estados Unidos; 2014; 1-1
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