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No escape? Costs and benefits of leaf de - submergence in the pasture grass Chloris gayana under different flooding regimes

Colaborador(es): Striker, Gustavo Gabriel. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Fisiología Vegetal.Buenos Aires, Argentina. CONICET - Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina. University of Western Australia. Faculty of Science. School of Agriculture and Environment.Crawley, Australia | Casas, Cecilia. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Edafología. Buenos Aires, Argentina | Kuang, Xiaolin. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Fisiología Vegetal. Buenos Aires, Argentina CONICET - Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina | Grimoldi, Agustín Alberto. Universidad de Buenos Aires. Facultad de Agronomía. Cátedra de Forrajicultura. Buenos Aires, Argentina CONICET - Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones Fisiológicas y Ecológicas vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina.
ISSN: 1445-4408.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): CHLORIS GAYANA CULTIVARS | FLOODING TIMING | LEAF DESICCATION | LEAF GREENNESS | PLANT RECOVERY | RHODES GRASS | SHOOT ELONGATION | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Functional Plant Biology Vol.44, no.9 (2017), p.899-906, tbls., grafs., fot.Resumen: Elongation - induced leaf emergence is one wayfor plants to deal with complete submergence by ‘escaping’ from water. This growth strategy is hypothesised to be more beneficial under single long-term submergence than under repeated short - term submergence events (i.e.fluctuating environment), as costs of repeated plant ‘adjustment’ would exceed the initial benefits of shoot elongation. To test this idea, 2 - week - old plants of Chloris gayana Kunth. cv. Fine Cut (a submergencetolerant cultivar first selected by a screening experiment) were grown for 4 weeks under (i) control conditions, (ii) two 1 - week submergence cycles, or (iii) one 2 - week submergence cycle. Additionally, a set of plants were placed below nettings to assess the cost of remaining forcedly submerged. Impeding leaves emergence through nettings did not compromise survival when submergence was 1 - week long, but determined the death of all plants when extended to 2 weeks. Growth as affected by flooding regime revealed that under one 2 - week submergence event, plants accumulated a 2.9 - fold higher dry mass than when they experienced the same submergence duration in separate events along 1week. The ‘escape’ strategy in the grass C. gayana, by which leaf contact with air is re-established, is essential for its survival, and it is more beneficial for plant growth under long-term submergence than under repeated short - term submergence cycles.
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Elongation - induced leaf emergence is one wayfor plants to deal with complete submergence by ‘escaping’ from water. This growth strategy is hypothesised to be more beneficial under single long-term submergence than under repeated short - term submergence events (i.e.fluctuating environment), as costs of repeated plant ‘adjustment’ would exceed the initial benefits of shoot elongation. To test this idea, 2 - week - old plants of Chloris gayana Kunth. cv. Fine Cut (a submergencetolerant cultivar first selected by a screening experiment) were grown for 4 weeks under (i) control conditions, (ii) two 1 - week submergence cycles, or (iii) one 2 - week submergence cycle. Additionally, a set of plants were placed below nettings to assess the cost of remaining forcedly submerged. Impeding leaves emergence through nettings did not compromise survival when submergence was 1 - week long, but determined the death of all plants when extended to 2 weeks. Growth as affected by flooding regime revealed that under one 2 - week submergence event, plants accumulated a 2.9 - fold higher dry mass than when they experienced the same submergence duration in separate events along 1week. The ‘escape’ strategy in the grass C. gayana, by which leaf contact with air is re-established, is essential for its survival, and it is more beneficial for plant growth under long-term submergence than under repeated short - term submergence cycles.

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