10.根寄生植物種子発芽刺激活性に対するストライゴラクトンB環修飾の効果(口頭発表)

概要

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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. Isolation of orobanchol and its acetate from red clover and cowpea root exudates, respectively, suggest the importance of modification at C-4 of the strigolactone molecule. In the present study we prepared HO-GR24 and AcO-GR24, both of which are modified at C-4 of the GR24 molecule, and evaluated their germination-inducing activity toward seeds of O. minor, S. hermonthica and S. gesnerioides. Modification of GR24 at C-4 with an acetoxy group did not affect the bioactivity toward S. hermonthica and O. minor. However, introduction of a hydroxy group at C-4 increased the activity toward O. minor, but decreased toward S. hermonthica. S. gesnerioides seeds did not respond to any of the synthetic strigolactones although the seeds were responsive to cowpea root exudates. These results demonstrate that modifications at C-4 affect the bioactivity. Moreover, the importance of the A-ring for the bioactivity toward S. gesnerioides seeds was suggested.
植物化学調節学会の論文
2008-10-06