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Soybean resistance to stink bugs [Nezara viridula and Piezodorus guildinii] increases with exposure to solar UV-B radiation and correlates with isoflavonoid content in pods under field conditions

Colaborador(es): Zavala, Jorge Alberto | Mazza, C. A | Dillon, Francisco María | Chludil, Hugo Daniel | Ballaré, Carlos Luis.
ISSN: 0140-7791.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): POD FEEDERS | PLANT-INSECT INTERACTIONS | PIEZODORUS GUILDINII | PENTATOMIDAE | NEZARA VIRIDULA | ISOFLAVONOIDS | HEXAPODA | GLYCINE MAX | GENISTIN | DAIDZIN | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: Plant, Cell and Environment vol.38, no.5 (2015), p.920-928Resumen: Solar UV-B radiation [280-315nm] has a significant influence on trophic relationships in natural and managed ecosystems, affecting plant-insect interactions. We explored the effects of ambient UV-B radiation on the levels of herbivory by stink bugs [Nezara viridula and Piezodorus guildinii] in field-grown soybean crops. The experiments included two levels of UV-B radiation [ambient and attenuated UV-B] and four soybean cultivars known to differ in their content of soluble leaf phenolics. Ambient UV-B radiation increased the accumulation of the isoflavonoids daidzin and genistin in the pods of all cultivars. Soybean crops grown under attenuated UV-B had higher numbers of unfilled pods and damaged seeds than crops grown under ambient UV-B radiation. Binary choice experiments with soybean branches demonstrated that stink bugs preferred branches of the attenuated UV-B treatment. We found a positive correlation between percentage of undamaged seeds and the contents of daidzin and genistin in pods. Our results suggest that constitutive and UV-B-induced isoflavonoids increase plant resistance to stink bugs under field conditions.
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Solar UV-B radiation [280-315nm] has a significant influence on trophic relationships in natural and managed ecosystems, affecting plant-insect interactions. We explored the effects of ambient UV-B radiation on the levels of herbivory by stink bugs [Nezara viridula and Piezodorus guildinii] in field-grown soybean crops. The experiments included two levels of UV-B radiation [ambient and attenuated UV-B] and four soybean cultivars known to differ in their content of soluble leaf phenolics. Ambient UV-B radiation increased the accumulation of the isoflavonoids daidzin and genistin in the pods of all cultivars. Soybean crops grown under attenuated UV-B had higher numbers of unfilled pods and damaged seeds than crops grown under ambient UV-B radiation. Binary choice experiments with soybean branches demonstrated that stink bugs preferred branches of the attenuated UV-B treatment. We found a positive correlation between percentage of undamaged seeds and the contents of daidzin and genistin in pods. Our results suggest that constitutive and UV-B-induced isoflavonoids increase plant resistance to stink bugs under field conditions.

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