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Plant Cell Environ

Title:		Solar UV-B radiation and ethylene play a key role in modulating effective defenses against Anticarsia gemmatalis larvae in field-grown soybean
Author(s):		Dillon FM; Tejedor MD; Ilina N; Chludil HD; Mithofer A; Pagano EA; Zavala JA;
Address:		"Catedra de Bioquimica, Facultad de Agronomia, Universidad de Buenos Aires, Avenida San Martin 4453, C1417DSE, Buenos Aires, Argentina. INBA/CONICET, Avenida San Martin 4453, C1417DSE, Buenos Aires, Argentina. Catedra de Quimica de Biomoleculas, Facultad de Agronomia, Universidad de Buenos Aires, Avenida San Martin 4453, C1417DSE, Buenos Aires, Argentina. Department of Bioorganic Chemistry, Max Planck Institute for Chemical Ecology, Jena, 07745, Germany"
Journal Title:		Plant Cell Environ
Year:		2018
Volume:		20171227
Issue:		2
Page Number:		383 - 394
DOI:		10.1111/pce.13104
ISSN/ISBN:		1365-3040 (Electronic) 0140-7791 (Linking)
Abstract:		"Solar UV-B radiation has been reported to enhance plant defenses against herbivore insects in many species. However, the mechanism and traits involved in the UV-B mediated increment of plant resistance are unknown in crops species, such as soybean. Here, we studied defense-related responses in undamaged and Anticarsia gemmatalis larvae-damaged leaves of two soybean cultivars grown under attenuated or full solar UV-B radiation. We determined changes in jasmonates, ethylene (ET), salicylic acid, trypsin protease inhibitor activity, flavonoids, and mRNA expression of genes related with defenses. ET emission induced by Anticarsia gemmatalis damage was synergistically increased in plants grown under solar UV-B radiation and was positively correlated with malonyl genistin concentration, trypsin proteinase inhibitor activity and expression of IFS2, and the pathogenesis protein PR2, while was negatively correlated with leaf consumption. The precursor of ET, aminocyclopropane-carboxylic acid, applied exogenously to soybean was sufficient to strongly induce leaf isoflavonoids. Our results showed that in field-grown soybean isoflavonoids were regulated by both herbivory and solar UV-B inducible ET, whereas flavonols were regulated by solar UV-B radiation only and not by herbivory or ET. Our study suggests that, although ET can modulate UV-B-mediated priming of inducible plant defenses, some plant defenses, such as isoflavonoids, are regulated by ET alone"
Keywords:		Abscisic Acid/metabolism Animals Cyclopentanes/metabolism Ethylenes/*metabolism Herbivory Larva *Moths Oxylipins/metabolism Plant Growth Regulators/*physiology Plant Leaves/physiology Salicylic Acid/metabolism Soybeans/*physiology/radiation effects Ultrav;
Notes:		"MedlineDillon, Francisco M Tejedor, M Daniela Ilina, Natalia Chludil, Hugo D Mithofer, Axel Pagano, Eduardo A Zavala, Jorge A eng Research Support, Non-U.S. Gov't 2017/12/02 Plant Cell Environ. 2018 Feb; 41(2):383-394. doi: 10.1111/pce.13104. Epub 2017 Dec 27"