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Plant Cell Environ

Title:		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
Author(s):		Zavala JA; Mazza CA; Dillon FM; Chludil HD; Ballare CL;
Address:		"Catedra de Bioquimica, Facultad de Agronomia, Universidad de Buenos Aires, C1417DSE, Buenos Aires, Argentina; INBA, Universidad de Buenos Aires, C1417DSE, Buenos Aires, Argentina; Consejo Nacional de Investigaciones Cientificas y Tecnicas, C1033AAJ, Buenos Aires, Argentina"
Journal Title:		Plant Cell Environ
Year:		2015
Volume:		20140605
Issue:		5
Page Number:		920 - 928
DOI:		10.1111/pce.12368
ISSN/ISBN:		1365-3040 (Electronic) 0140-7791 (Linking)
Abstract:		"Solar UV-B radiation (280-315 nm) 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"
Keywords:		Animals Fruit/metabolism Genistein/*metabolism *Herbivory *Heteroptera Isoflavones/*metabolism Soybeans/metabolism/*radiation effects Ultraviolet Rays daidzin genistin isoflavonoids plant-insect interactions pod feeders;
Notes:		"MedlineZavala, Jorge A Mazza, Carlos A Dillon, Francisco M Chludil, Hugo D Ballare, Carlos L eng Research Support, Non-U.S. Gov't 2014/05/09 Plant Cell Environ. 2015 May; 38(5):920-8. doi: 10.1111/pce.12368. Epub 2014 Jun 5"