61.ストリゴラクトン類縁化合物の枝分かれ抑制活性の評価(口頭発表)

概要

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Strigolactones are host recognition signals for arbuscular mycorrhizal fungi and root plasitic plants, such as Striga and Orobanche. They also inhibit shoot branching in host plants. However, the structural requirements of strigolactones for shoot branching inhibition have not yet been elucidated. Thus, we evaluated the structure-activity relationship of various strigolactone analogues in shoot branching inhibition. 5-deoxystrigol (5DS) is a natural strigolactone in rice. Among 5DS stereoisomers, (+)-5DS and (-)-2'-epi-5DS, whose C2' configuration is R, showed stronger activity than the 2'S-isomers. In rice cv. Shiokari, (-)-2'-epi-5DS was detected as a major endogenous strigolactone. Likewise, (+)-GR24 and (-)-2'-epi-GR24 showed stronger activity among the four stereoisomers of GR24. Therefore, the R configuration at C2' is crucial for the biological activity in shoot branching assays. We also found that 3,6'-dihydro GR24 was inactive, suggesting that the double bond in the enol ether bridge connecting the C and D rings is essential for shoot branching inhibition in rice.
植物化学調節学会の論文
2009-10-06