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A Rare Sugar, d-Allose, Confers Resistance to Rice Bacterial Blight with Upregulation of Defense-Related Genes in Oryza sativa

January 2010 , Volume 100 , Number  1
Pages  85 - 90

Akihito Kano, Kenji Gomi, Yumiko Yamasaki-Kokudo, Masaru Satoh, Takeshi Fukumoto, Kouhei Ohtani, Shigeyuki Tajima, Ken Izumori, Keiji Tanaka, Yutaka Ishida, Yasuomi Tada, Yoko Nishizawa, and Kazuya Akimitsu

First, second, third, fifth, sixth, seventh, eighth, eleventh, and thirteenth authors: Faculty of Agriculture, Gene Research Center, and Rare Sugar Research Center, Kagawa University, Miki, Kagawa, 761-0795, Japan; fourth author: National Agricultural Research Center for Kyushu Okinawa Region (NARO), Koshi, Kumamoto, 861-1192, Japan; ninth author: Mitsui Chemicals Agro Co. Ltd., Yasu, Shiga, 520-2342, Japan; tenth author: Shikoku Research Institute Inc., Yashima-nishi, Takamatsu, 761-0192, Japan; and twelfth author: National Institute of Agrobiological Sciences (NIAS), Tsukuba, 305-8602, Japan.

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Accepted for publication 9 September 2009.

We investigated responses of rice plant to three rare sugars, d-altrose, d-sorbose, and d-allose, due to establishment of mass production methods for these rare sugars. Root growth and shoot growth were significantly inhibited by d-allose but not by the other rare sugars. A large-scale gene expression analysis using a rice microarray revealed that d-allose treatment causes a high upregulation of many defense-related, pathogenesis-related (PR) protein genes in rice. The PR protein genes were not upregulated by other rare sugars. Furthermore, d-allose treatment of rice plants conferred limited resistance of the rice against the pathogen Xanthomonas oryzae pv. oryzae but the other tested sugars did not. These results indicate that d-allose has a growth inhibitory effect but might prove to be a candidate elicitor for reducing disease development in rice.

Additional keywords:induced resistance.

© 2010 The American Phytopathological Society