Two purified oligosaccharide elicitors,N-acetylchitohepatose and tetraglucosyl glucitol, derived fromMagnaporthe grisea cell walls, synergistically activate biosynthesis of phytoalexin in suspension-cultured rice cells |
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| Authors: | Takeshi Yamaguchi Yumiko Maehara Osamu Kodama Mitsuo Okada Masatoshi Matsumura Naoto Shibuya |
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| Affiliation: | aBiochemistry Department, National Institute of Agrobiological Sciences, Tsukuba, Ibaraki, 305-8602, Japan;bBRAIN, Minato-ku, Tokyo, 105-0001, Japan;cIbaraki University, Ami, Ibaraki, 300-0393, Japan;dInstitute of Applied Biochemistry, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan |
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| Abstract: | Two purified oligosaccharide elicitors generatable from fungal cell walls, N-acetylchitoheptaose and a tetraglucosyl glucitol from rice blast fungus (Magnaporthe grisea), synergistically activated phytoalexin biosynthesis in cultured rice cells. Inhibition experiments for the binding of radiolabeled N-acetylchitooligosaccharide elicitor to the plasma membrane from rice cells indicate that the two elicitors are recognized by different receptors. These results also indicate the presence of a positive interaction between the signal transduction cascade downstream of each elicitor/receptor, which enhances resistance against pathogens. |
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| Keywords: | chitin elicitor β -glucan Oryzae sativa phytoalexin signal transduction |
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