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Light - mediated self - organization of sunflower stands increases oil yield in the field

Colaborador(es): López Pereira, Mónica. Departamento de Producción Vegetal, Cátedra de Cultivos Industriales, Facultad de Agronomía, Universidad de Buenos Aires, Buenos Aires C1417DSE, Argentina - Email: pereiram@agro.uba.ar | Sadras, Victor Oscar. South Australian Research and Development Institute, Adelaide, SA 5000, Australia and School of Agriculture, Food and Wine, University of Adelaide, Adelaide, SA 5005, Australia | Batista, William Bennett. Facultad de Agronomía, Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Universidad de Buenos Aires/Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires C1417DSE, Argentina | Casal, Jorge José. Facultad de Agronomía, Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Universidad de Buenos Aires/Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires C1417DSE, Argentina | Hall, Antonio Juan. Facultad de Agronomía, Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Universidad de Buenos Aires/Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires C1417DSE, Argentina.
Tipo de material: Recurso electrónico. Artículos y capítulos.Tema(s): CROP YIELD | SHADE AVOIDANCE | SELF-ORGANIZATION | STAND DENSITY | PHYTOCHROME | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Proceedings of the National Academy of Sciences of the United States of America Vol.114, no.30 (2017), p.7975-7988, grafs., fot.Resumen: Here, we show a unique crop response to intraspecific interference, whereby neighboring sunflower plants in a row avoid each other by growing toward a more favorable light environment and collectively increase production per unit land area. In high-density stands, a given plant inclined toward one side of the interrow space, and the immediate neighbors inclined in the opposite direction. This process started early as an incipient inclination of pioneer plants, and the arrangement propagated gradually as a “wave” of alternate inclination that persisted until maturity. Measurements and experimental manipulation of light spectral composition indicate that these responses are mediated by changes in the red/far-red ratio of the light, which is perceived by phytochrome. Cellular automata simulations reproduced the patterns of stem inclination in field experiments, supporting the proposition of self-organization of stand structure. Under high crop population densities (10 and 14 plants per m2), as yet unachievable in commercial farms with current hybrids due to lodging and diseases, self-organized crops yielded between 19 and 47% more oil than crops forced to remain erect.
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Here, we show a unique crop response to intraspecific interference, whereby neighboring sunflower plants in a row avoid each other by growing toward a more favorable light environment and collectively increase production per unit land area. In high-density stands, a given plant inclined toward one side of the interrow space, and the immediate neighbors inclined in the opposite direction.
This process started early as an incipient inclination of pioneer plants, and the arrangement propagated gradually as a “wave” of alternate inclination that persisted until maturity.
Measurements and experimental manipulation of light spectral composition indicate that these responses are mediated by changes in the red/far-red ratio of the light, which is perceived by phytochrome.
Cellular automata simulations reproduced the patterns of stem inclination in field experiments, supporting the proposition of self-organization of stand structure.
Under high crop population densities (10 and 14 plants per m2), as yet unachievable in commercial farms with current hybrids due to lodging and diseases, self-organized crops yielded between 19 and 47% more oil than crops forced to remain erect.

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