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PREFERENCES OF PLUTELLA XYLOSTELLA OVIPOSITION FOR MECHANICALLY DAMAGED, HERBIVORE DAMAGED, AND PLANT-PLANT PRIMED ARABIDOPSIS THALIANA

出版	Bowling Green State University, 2014
URL	http://books.google.com.hk/books?id=genrjgEACAAJ&hl=&source=gbs_api

註釋Previous studies have shown that herbivore-induced plant volatiles can affect responses of damaged plants, neighboring plants, and insect herbivores. However, little is known about how different types of plant induction affect the oviposition behavior of insect herbivores. In this study, the effects of inducing plants by exposing them to an insect herbivore, mechanical damage or a damaged neighboring plant was evaluated on the oviposition preferences of the diamondback moth Plutella xylostella. The potential role of plant genotypes differing in their glucosinolate hydrolysis profiles was also evaluated by using a wild ecotype (Col-0) and a genetically modified (GM) line(tgg1tgg2) of the model plant Arabidopsis thaliana. While the wild type Col-0 line has normal production of hydrolysis products (mainly isothiocyanates in its leaf tissues), the double myrosinase knockout (tgg1 tgg2) is defective in the production of these volatiles. Dual choice oviposition assays were performed using naive females of Plutella xylostella and the two A. thaliana lines differing in their hydrolysis profiles, which were exposed to the three different types of induction treatments. Female oviposition preferences were significantly influenced by the type of induction to which a plant was exposed as well as by the plant genotype, which differed in their glucosinolate hydrolysis profiles. For example, P. xylostella females significantly preferred to oviposit on herbivore damaged plants (versus undamaged controls) when Col-0 plants were used, but chose control plants when presented with the double myrosinase knockout tgg1tgg2. However, plant genotype did not influence oviposition choices between plant-plant primed or mechanically damaged plants and undamaged controls. Results from this study showed that the type of plant induction and genotype influenced insect oviposition preferences and suggest that these factors may be important to consider as part of the management strategies used to control specialist insect pests such as the diamondback moth P. xylostella.