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
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...
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| Otros Autores: | , , , , |
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| Formato: | Manuscrito Artículo |
| Lenguaje: | Español |
| Materias: | |
| Acceso en línea: | http://ri.agro.uba.ar/files/intranet/articulo/2015zavala.pdf LINK AL EDITOR |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| Sumario: | 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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| ISSN: | 0140-7791 |