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Báo cáo khoa học: "How do plant defense compounds influence the oviposition behaviour of small cabbage white butterfly Pieris rapae (Linnaeus)"

Tuyển tập báo cáo nghiên cứu khoa học của trường đại học nông nghiệp 1 đề tài: How do plant defense compounds influence the oviposition behaviour of small cabbage white butterfly Pieris rapae (Linnaeus)? | Journal of Science and Development April 2008 75-82 HANOI UNIVERSITY OF AGRICULTURE HOW DO PLANT DEFENSE COMPOUNDS INFLUENCE THE OVIPOSITION BEHAVIOUR OF SMALL CABBAGE WHITE BUTTERFLy PIERIS Rd 4E LINNAEUS Vu Quoc Ngu Michel Zevenbergen Maaike Bruinsma and Joop van Loon Research affairs and International cooperation office Entomology laboratory- Wageningen University- The Netherlands ABSTRACT Jasmonic acid JA is an elicitor for induced plant defense. Herbivore attack causes an increase in endogenous JA in a plant but exogenous JA treatment induces a similar set of compounds as an attack by an insect herbivore. In some plants volatiles are induced after plant injury by herbivores and these volatiles repel the future herbivores. But do volatiles also have an effect on ovipositing herbivores In this experiment the effect of JA an inducing compound of volatiles and attack of caterpillars on the oviposition behavior of the small cabbage white butterflies Pieris rapae on Brussels sprouts plants Brassica oleracea gemmifera cv. Cyrus is investigated. A JA concentration of 0.1 mM and attack of P. rapae caterpillars negatively affect the oviposition behavior of the butterfly P. rapae butterflies prefer to lay their eggs on untreated leaves. However lower concentrations of JA did not have an effect on the oviposition preference of the butterflies. Key words Jasmonic acid oviposition plant volatile Pieris rapae 1. INTRODUCTION Several studies demonstrated that herbivore-injured plants produce specific blends of volatiles which can be attractive to certain insect predators and parasitoids Dicke 1994 Turlings at al. 1995 . Previous experiments from Steinberg et al. 1992 and Mattiacci et al. 1994 concluded that the parasitoid Cotesia glomerata is attracted by volatiles emitted by Brussels sprout after this plant is injured by Pieris brassica larvae. Another study from Turlings 1990 concluded that seedlings which were artificially damaged and treated with the regurgitant of .