Possible role of phytocassane, rice phytoalexin, in disease resistance of rice against the blast fungus Magnaporthe grisea.
In addition to momilactone, phytocassanes A through E (diterpene phytoalexins) were detected in rice leaves in fields suffering from rice blast. Furthermore, phytocassane accumulation was most abundant at the edges of necrotic lesions, indicating that the phytoalexins prevent subsequent spread of the fungus from the infected site. In pot experiments the pattern of phytocassane accumulation in rice leaves in an incompatible interaction (infection with an avirulent race of Magnaporthe grisea) was more rapidly induced than in a compatible interaction (infection with a virulent race of M. grisea).
Umemura
Kenji
K
Health & Bioscience Laboratories, Meiji Seika Kaisha Ltd., 5-3-1 Chiyoda, Sakado, Saitama 350-0289, Japan. kenji_umemura@meiji.co.jp
Ogawa
Noriko
N
Shimura
Masaru
M
Koga
Jinichiro
J
Usami
Hideki
H
Kono
Toshiaki
T
D000890:Anti-Infective Agents / Q000494:pharmacology*; D004224:Diterpenes / Q000378:metabolism; D007113:Immunity, Innate / Q000187:drug effects; D020082:Magnaporthe / Q000187:drug effects*; D012275:Oryza / Q000737:chemistry* / Q000382:microbiology; D010935:Plant Diseases / Q000382:microbiology*; D010936:Plant Extracts / Q000032:analysis / Q000096:biosynthesis* / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry; D012717:Sesquiterpenes; D013729:Terpenes; D000094162:Phytoalexins
D000890:Anti-Infective Agents; D004224:Diterpenes; D010936:Plant Extracts; D012717:Sesquiterpenes; D013729:Terpenes; D000094162:Phytoalexins