Lotus japonicus Infested with Herbivorous Mites Emits Volatile Compounds That Attract Predatory Mites |
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| Authors: | Rika Ozawa Takeshi Shimoda Masayoshi Kawaguchi Gen-ichiro Arimura Jun-ichiro Horiuchi Takaaki Nishioka Junji Takabayashi |
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| Institution: | (1) Laboratory of Ecological Information, Graduate School of Agriculture, Kyoto University, Kyoto, 606–8502 Japan, JP;(2) Bio-oriented Technology Research Advancement Institution, Tokyo, 105–0001 Japan, JP;(3) Department of Life Science, Graduate School of Arts and Sciences, University of Tokyo, Tokyo, 153–8902 Japan, JP;(4) Laboratory of Insect Physiology, Graduate School of Agriculture, Kyoto University, Kyoto, 606–8502 Japan, JP |
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| Abstract: | Lotus Japonicus has an indirect defense mechanism against spider mites, Tetranychus urticae, we investigated the responses of predatory mites, Phytoseiulus persimilis, to volatile compounds released from T. urticae-infested L. japonicus in a Y-tube olfactometer. Plants infested with spider mites attracted more P. persimilis than did clean air. Uninfested plants and artificially damaged plants did not attract P. persimilis. When infested by spider mites, L. japonicus plants started emitting (Z)-3-hexenyl acetate, (E)-4,8-dimethyl-1,3,7-nonatriene, germacrene d, 1-octen-3-ol and methyl salicylate (MeSA). These compounds were considered
to be T. urticae-induced plant volatile compounds. When three L. japonicus mutants deficient in nodule organogenesis were infested by the spider mites, they all attracted P. persimilis. However, two of the infested mutants emitted blends of induced volatile compounds that were qualitatively different from
those emitted from infested wild type L. japonicus.
Received 8 August 2000/ Accepted in revised form 12 October 2000 |
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| Keywords: | : Herbivore-induced volatile compounds Lotus japonicus Predatory mites Phytoseiulus persimilis Spider mites Tetranychus urticae Tritrophic interactions |
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