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Plant and Cell Physiology, 2002, Vol. 43, No. 7 778-784
© 2002 Oxford University Press

Elicitor Activity of Cerebroside, a Sphingolipid Elicitor, in Cell Suspension Cultures of Rice

Kenji Umemura1,2,3, Noriko Ogawa2, Jinichiro Koga1, Michiaki Iwata1,2 and Hideki Usami1

1 Bioscience Laboratories, Meiji Seika Kaisha Ltd., 5-3-1, Chiyoda, Sakado-shi, Saitama, 350-0289 Japan
2 Plant Biological Defense System Laboratories, 1962, Sone, Nishikawa-machi, Nishikanbara-gun, Niigata, 959-0422 Japan

Cerebrosides, compounds categorized as glycosphingolipids, were found to occur in a wide range of phytopathogens as novel elicitors and to induce the effective disease resistance for rice plants in our previous study. Here, we showed that cerebroside elicitors lead to the accumulation of phytoalexins and pathogenesis-related (PR) protein in cell suspension cultures of rice with the structural specificity similar to that for the rice whole plants. This elicitor activity of the cerebroside was greater than jasmonic acid (JA) and chitin oligomer (which is known to be an elicitor for cell suspension cultures of rice). Treatment of cell suspension cultures with cerebroside and chitin oligomer resulted in a synergetic induction of phytoalexins, suggesting that cerebroside and carbohydrate elicitors, such as glucan and chitin elicitor, enhance the defense signals of rice in vivo. Induction of phytoalexins by the treatment with cerebroside elicitor was markedly inhibited by LaCl3 and GdCl3, Ca2+ channel blockers. It is possible that Ca2+ may be involved in the signaling pathway of elicitor activity of cerebroside.

3 Correspondence author: E-mail, kenji_umemura@meiji.co.jp; Fax, +81-492-84-7598.


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