摘要
比较了19种油菜甾醇内酯类似物和有关甾体化合物在水稻叶片倾斜及萝卜幼苗生长试验中的生物活性。表油菜甾醇内酯(24—Epi—BR)在两个系统中都具有很强的生物活性。C_2位失去羟基(香蒲甾醇)仅在水稻试验中有高活性,改变C_22位侧链结构(2α,3α双羟基—6—酮—23,24—双失碳—β—高-5α—胆烷酸甲酯)在萝卜试验中仍有活性。
The biological activities of nineteen bras-
sinolide analogues and related steroidal com-
pounds were compared using two bioassay sys-
tems: rice lamina inclination test and intact
radish elongation test. In rice test, 24-epibras-
sinolide exhibited the highest. activity, while
in radish test compounds (12), (13) exhibited
the highest (Table 1). The biological activity
of 24-epibrassinolide increased with the increase
of the corcentration from 0.0001 to 1 ppm in
rice lamina inclination test (Fig. 2) and from
0.01 to 1 ppm in intact radish test (Fig. 3, 4).
A compound which lost hydroxy group in 2-
carbon position,such as compound (4), showed
activity only in rice test, while compound(2)
with modified side chain in 22-carbon position
could significantly promote elongation of the
cotyledon petiole and hypocotyl of intact
radish (Table 1).
Similar effects of brassinolide analogues on
different varieties of rice were observed(Table 2).
The relationship between the structure and bio-
logical activity was discussed.
基金
国家自然科学基金
关键词
油菜甾醇内酯
类似物
结构
epibrassinolide
typhasterol
brassinolide analogues
rice lamina
radish seedlings