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Plant and Cell Physiology, 2002, Vol. 43, No. 7 823-831
© 2002 Oxford University Press

Chloroisonicotinamide Derivative Induces a Broad Range of Disease Resistance in Rice and Tobacco

Hideo Nakashita1,2,9, Michiko Yasuda1,3,4, Masanori Nishioka1,5, Satoru Hasegawa1,6, Yuko Arai1,4,7, Masakazu Uramoto6, Shigeo Yoshida2,3 and Isamu Yamaguchi1,4,8

1 Microbial Toxicology Laboratory, RIKEN Institute, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198 Japan
2 Plant Function Laboratory, RIKEN Institute, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198 Japan
3 Laboratory for Growth Regulation, Plant Science Center, RIKEN Institute, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198 Japan
4 Graduate School of Science and Engineering, Saitama University, 255 Shimookubo, Saitama-shi, Saitama, 338-8570 Japan
5 Biological Research Laboratories, Nissan Chemical Industries, Ltd., 1470 Shiraoka, Minamisaitama, Saitama, 349-0294 Japan
6 Department of Applied Biological Chemistry, Tamagawa University, Machida, Tokyo, 194-8610 Japan
7 Present address: Polymer Chemistry Laboratory, RIKEN Institute, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198 Japan
8 Present address: Laboratory for Remedition Research, Plant Science Center, RIKEN Institute, 2-1 Hirosawa, Wako-shi, Saitama, 351-0198 Japan

Systemic acquired resistance (SAR) is a potent innate immunity system in plants that is effective against a broad range of pathogens. SAR in dicotyledonous plants such as tobacco and Arabidopsis has been partially elucidated and is mediated by salicylic acid (SA). However, the SAR mechanism of monocotyledonous rice plants remains to be clarified, although some similarities between SAR mechanisms in both types have been reported. Here we have characterized N-cyanomethyl-2-chloroisonicotinamide (NCI) as an effective SAR inducer in both plant species. Soil drench application of NCI induces a broad range of disease resistance in tobacco and rice and, more specifically, PR gene expression in tobacco. Both SA measurements in wild-type NCI-treated tobacco and pathogenic infection studies using NahG transgenic tobacco plants indicate that NCI-induced resistance enhancement does not require SA. Therefore, it is suggested that NCI induces SAR by triggering signaling at the same level as or downstream of SA accumulation as do both benzo(1,2,3)thiadiazole-7-carbothioic acid S-methyl ester and 2,6-dichloroisonicotinic acid. The fact that all of these chemicals are effective in rice and tobacco suggests that several common components function in disease resistance in both plant species.

9 Corresponding author: E-mail, nakashi@postman.riken.go.jp; Fax, +81-48-462-4959.


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