51. イネのフィトアレキシン、モミラクトンA,BとオリザレキシンA-Fの生合成に関与するジテルペン環化酵素

概要

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Rice (Oryza sativa L.) produces diterpene phytoalexins, such as momilactones, oryzalexins and phytocassanes. By using the rice genome information and in vitro assay with recombinant enzymes, we identified genes (OsKS4 and OsKS10) encoding the type-A diterpene cyclases 9β -pimara-7,15-diene synthase and ent-sandaracopimaradine synthase that are involved in the biosynthesis of momilactones A,B and oryzalexins A-F, respectively. Transcript levels of these two genes were increased remarkably after ultra-violet (UV) treatment, which is consistent with the elevated production of phytoalexins by UV. These two genes will be powerful tools for understanding plant defense mechanisms in rice.
植物化学調節学会の論文
2004-10-13