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Junji TAKABAYASHI@Profile


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Junji TAKABAYASHI
Professor
1986 Dr. of Agriculture, Kyoto University



Phone : +81-77-549-8235
Fax : +81-77-549-8201
E-mail : junji@ecology.kyoto-u.ac.jp



Tritrophic interactions consisting of plants, herbivorous arthropods and carnivorous natural enemies of herbivores.

When plants are infested by herbivores, they start emitting a specific blend of volatiles (herbivore-induced volatiles) that attract carnivorous natural enemies of herbivores. We studied such plant-carnivore interactions in 2 types of tritrophic systems: one consisting of plants, herbivorous mites and predaceous phytoseiid mites; and another consisting of plants, caterpillars and endoparasitic wasps. The following is a summary of the results of the present study.

  1. Blends of herbivore-induced volatiles were specific to plant species, plant cultivars, plant developmental stage, herbivore species and herbivore developmental stage. This specificity affected the carnivores' searching efficiency.
  2. There were cases in which the production of herbivore-induced plant volatiles was adaptive to plants, and cases in which the production was maladaptive to them.
  3. Herbivore-induced volatiles attracted carnivores not only under laboratory conditions but also under field conditions.
  4. The presence of both prey and nonprey species on the same plant affected the degree to which prey-induced plant volatiles were attractive to carnivores, and also affected the oviposition preferences of female herbivores.
  5. Carnivores react to specific blends of herbivore-induced volatiles.
  6. We studied the molecular mechanisms of the production of herbivore-induced plant volatiles, and found that both a jasmonic acid-related signaling pathway and salicylic acid-related signaling pathway were involved in production.
  7. We observed plant-plant interactions that were mediated by herbivore-induced plant volatiles.

These results show that it is important to take into account not only life-and-death struggles but also (mutualistic) information transfer between organisms, in order to understand ecosystems. In future studies, we will attempt to clarify infochemical interaction networks in ecosystems.


Keywords : chemical ecology, tritrophic interactions, infochemicals, networks, indirect effects, natural enemies, biological control



Selected Publications

  1. Shiojiri, k., Takabayashi, J., Yano, S. and Takafuji, A. (2001) Infochemically mediated tritrophic interaction webs on cabbage plants. Population Ecology 43: 23-29
  2. Shimoda, T. and Takabayashi, J. (2001) Migration of specialist insect predators to exploit patchily distributed spider mites. Population Ecology 43: 15-21
  3. Ozawa, R., Shimoda, T., Kawaguchi, M., Arimura, G., Nishioka, T. and Takabayashi, J. (2000) Lotus japonicus infested with herbivorous mites emits volatile compounds that attract predatory mites. Journal of Plant Research 113: 427-433
  4. Takabayashi, J., Shimoda, T., Dicke, M., Ashihara, W. and Takafuji, A.. (2000) Induced response of tomato plants against injury by green and red strains of Tetranychus urticae. Experimental and Applied Acarology 24: 377-383
  5. Arimura, G., Nishioka, T., Tashiro, K., Kuhara, S. and Takabayashi, J. (2000) Comprehensive responses in lima bean leaves induced by herbivore-induced volatiles. Biochemical Biophysical Research Communication 277: 305-310
  6. Arimura, G., Ozawa, R., Shimoda, T., Nishioka, T., Boland, W. and Takabayashi, J. (2000) Herbivory-induced volatiles elicit defence genes in lima bean leaves. Nature 6795: 512-515
  7. Ozawa, R., Arimura, G., Takabayashi, J., Shimoda, T., and Nishioka, T. (2000) Involvement of jasmonate- and salicylate-related signaling pathways for the production of specific herbivore-induced volatiles in plants. Plant and Cell Physiology. 41: 391-398
  8. Takabayashi, J., Sato, Y., Horikoshi, M., Yamaoka, R., Yano, S., Ohsaki, N. and Dicke, M. (1998) Plant Effects on Parasitoid Foraging: Differences among Two Tritrophic Systems . Biological Control 11: 97-103
  9. Shimoda, T., Takabayashi, J., Ashihara, W. and Takafuji, A. (1997) Response of predatory insects Scolothrips takahashii toward herbivore-induced plant synomone in both laboratory and field conditions. Journal of Chemical Ecology 23: 2033-2048
  10. Takabayashi, J. and Dicke, M. (1996) Plant-carnivore mutualism through herbivore-induced carnivore attractants. Trends in Plant Science 1: 109-113
  11. Takabayashi, J., Takahashi, S., Dicke, M. and Posthumus, M. A. (1995) Developmental stage of the herbivore Pseudaletia separata affects production of herbivore-induced synomone by corn plants. Journal of Chemical Ecology 21: 273-287
  12. Takabayashi, J., Dicke, M. and Posthumus, M. A. (1994) Volatile herbivore-induced terpenoids in plant-mite interactions: variation caused by biotic and abiotic factors. Journal of Chemical Ecology 20:1324-1354


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