60.根寄生植物の種子発芽刺激活性に対するストライゴラクトンB環の修飾の影響について(口頭発表)

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The seeds of root parasitic plants Orobanche spp. and Striga spp. only germinate when they are exposed to stimulant molecules, collectively referred to as strigolactones. In this study, strigolactones and their synthetic analogs with modification at C-4 were evaluated for their potency in inducing seed germination of S. hermonthica, S. gesnerioides, and O. minor. We prepared three synthetic analogs, GR24, OH-GR24 having a hydroxy group at position C-4, and AcO-GR24 having an acetoxy group at C-4, and these compounds were used for the seed germination assay. In the S. hermonthica germination assay, the activity was GR24>OH-GR24 and AcO-GR24. In the O. minor germination assay, the activity was OH-GR24>GR24 and AcO-GR24. These results suggest that the modification at C-4 is an important factor to determine the activity and the specifity of strigolactones for the parasites. In contrast, S. gesnerioides seeds did not respond to any of the synthetic strigolactones while the seeds were responsive to cowpea root exudates that contain orobanchyl acetate as a stimulant. Although it is known that the CD-ring structure of strigolactones is essential for their bioactivity, the results obtained in this study suggested the importance of the A-ring structure for the bioactivity toward S. gesnerioides.
2009-10-06