Plant growth-regulating activities of batatasin III analogues

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Nine bibenzyls and 10 stilbenes were synthcsized as analogues of batatasin III, a growth inhibitor isolated from dormant yam bulbils, and examined for their plant growth-regulating activities. The bioassays used were the elongation of dark-grown intact rice coleoptiles, auxin-induced elongation of excised oat coleoptiles, and germination of rape and barnyard grass seeds. In the elongation of intact rice coleoptiles, 3,3'-dihydroxy-5-methoxy- (batatasin III), 3,5-dimethoxy-3'-nitro-, 4'-bromo-3-nitro-, 3-amino-3'-chloro-, 3-amino-4'-chloro-bibenzyls and 3-benzyloxy-4'-bromo-5-methoxy-, 3-benzyloxy-3',4'-dichloro-5-methoxystilbenes were inhibitory, and 4'-bromo-3-nitro-stilbene was promotive at a concentration of 100 mg/liter. The results obtained by the other bioassays were qualitatively consistent with these findings, although 3-amino-4'-chlorobibenzyl and 4'-bromo-3-nitrostilbene were not tested in all the bioassays. In the seed germination, which was rather tolerant to the test analogues, batatasin III was inactive but 3-benzyloxy-4'-bromo-5-methoxy- and 3-benzyloxy-3',4'-dichloro-5-methoxystilbenes were very active. Thus, if substituted properly, bibenzyls and stilbenes are active without hydroxyl and methoxyl group(s) as the functional group.
日本植物生理学会の論文