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Bull Entomol Res

Title:		Herbivory-induced plant volatiles from Oryza sativa and their influence on chemotaxis behaviour of Tibraca limbativentris Stal. (Hemiptera: Pentatomidae) and egg parasitoids
Author(s):		Melo Machado RC; Sant'Ana J; Blassioli-Moraes MC; Laumann RA; Borges M;
Address:		"Departamento de Fitossanidade, Faculdade de Agronomia, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil. Embrapa Recursos Geneticos e Biotecnologia, Brasilia, Brazil"
Journal Title:		Bull Entomol Res
Year:		2014
Volume:		20140312
Issue:		3
Page Number:		347 - 356
DOI:		10.1017/S0007485314000133
ISSN/ISBN:		1475-2670 (Electronic) 0007-4853 (Linking)
Abstract:		"The rice stem bug, Tibraca limbativentris Stal. (Hemiptera: Pentatomidae) is one of the most important pests of rice crops, especially irrigated crops. Plant defence strategies against these bugs may involve the emission of chemical compounds, which are released following herbivore attacks, directly or indirectly harming pest performance. The aim of this study was to evaluate the influence of constitutive and herbivory-induced volatiles from rice plants (Oryza sativa L.) on the behavioural responses of T. limbativentris adults and egg parasitoids Trissolcus basalis (Wollaston) and Telenomus podisi (Ashmead) (Hymenoptera, Platygastridae). Plant volatiles were collected from undamaged plants of the rice cultivar IRGA 424 and from plants that suffered herbivory by five males or five females of T. limbativentris. Air-entrainment extracts were analysed by GC-flame ionization detector and GC-MS, and insect responses evaluated in a 'Y' olfactometer. T. limbativentris feeding damaged on rice plants induced the release of 16 volatiles compounds in a higher amounts compared to undamaged plants The main compounds induced were (E)-2-hexenal, (E)-2-octen-1-ol, methyl salicylate and alpha-muurolene. Female bugs were significantly attracted to air-entrainment extracts containing volatiles from undamaged plants compared with air-entrainment extracts containing volatiles emitted from plants damaged by T. limbativentris, whereas males showed no preference. Telenomus podisi females were significantly attracted to volatiles from air-entrainment extracts of plants damaged by females, whereas T. basalis showed no preference. These results suggest that rice plants may be emitting defence compounds, which could be avoided by T. limbativentris females and also acted indirectly by attracting natural enemies"
Keywords:		Animals Appetitive Behavior/drug effects Brazil Chemotaxis/drug effects Female Food Chain Herbivory/drug effects Heteroptera/drug effects/*parasitology/*physiology Hymenoptera/drug effects/*physiology Male Oryza/growth & development/*metabolism Volatile O;
Notes:		"MedlineMelo Machado, R C Sant'Ana, J Blassioli-Moraes, M C Laumann, R A Borges, M eng England 2014/03/14 Bull Entomol Res. 2014 Jun; 104(3):347-56. doi: 10.1017/S0007485314000133. Epub 2014 Mar 12"