PLANT CELL WALL WITH FUNGAL SIGNALS MAY DETERMINE HOST-PARASITE SPECIFICITY

Shiraishi, T.; Kiba, A.; Inata, A.; Sugimoto, M.; Toyoda, K.; Ichinose, Y.; Yamada, T.

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자료유형: 학술대회자료

저자정보: Shiraishi, T. (Laboratory of Plant Pathology & Genetic Engineering, College of Agriculture, Okayama University) Kiba, A. (Laboratory of Plant Pathology & Genetic Engineering, College of Agriculture, Okayama University) Inata, A. (Laboratory of Plant Pathology & Genetic Engineering, College of Agriculture, Okayama University) Sugimoto, M. (Laboratory of Plant Pathology & Genetic Engineering, College of Agriculture, Okayama University) Toyoda, K. (Laboratory of Plant Pathology & Genetic Engineering, College of Agriculture, Okayama University) Ichinose, Y. (Laboratory of Plant Pathology & Genetic Engineering, College of Agriculture, Okayama University) Yamada, T. (Laboratory of Plant Pathology & Genetic Engineering, College of Agriculture, Okayama University)

저널정보: 한국식물학회 한국식물학회 심포지움 한국식물학회 1998년도 The 12th Symposium on Plant Biotechnology Vol.12

발행연도: 1998.1

수록면: 10 - 18 (9page)

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For improvement of plants in disease resistance, it is most important to elucidate the mechanism to perceive and respond to the signal molecules of invaders. A model system with pea and its pathogen, Mycosphaerella pinodes, showed that the fungal elicitor induced defense responses in all plant species tested but that the suppressor of the fungus blocked or delayed the expression of defense responses and induced accessibility only in the host plant. In the world, many researchers believe that the pathogens` signals are recognized only on the receptors in the plasma membranes. Though we found that the ATPase and polyphosphoinositide metabolism in isolated plasma membranes responded to these fungal signals, we failed to detect specific actions of the suppressor in vitro on these plasma membrane functions. Recently, we found that ATPase (NTPases) and superoxide generating system in isolated cell wall were regulated by these fungal signals even in vitro, especially, by the suppressor in a strictly species-specific manner and also that the cell wall alone prepared an original defense system. The effects of both fungal signals on the isolated cell wall functions in vitro coincide perfectly with those on defense responses in vivo. In this treatise, we discuss the key role of the cell wall, which is plant-specific and the most exterior organelle, in determining host-parasite specificity and molecular target for improvement of plants.

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