Plant growth regulator activities of stereochemical isomers of triadimenol
Plant growth regulator activities of stereochemical isomers of triadimenol
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三唑醇立体化学异构体的植物生长调节活性
DOI：
10.1111/j.1399-3054.1987.tb04348.x
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发表时间：
1987
影响因子：
6.4
通讯作者：
W. Köller
中科院分区：
文献类型：
--
作者：
W. Köller
小麦(Triticum aestivum L.cv.为了确定植物生长迟缓的生化基础，用三唑醇的各个异构体处理银杏。IS，2R异构体的植物生长抑制活性最高，其次是1R，2S异构体。外源赤霉酸不能解除外源赤霉酸对生长的抑制作用，提示其作用方式不同于抑制赤霉素的合成。用放射性醋酸酯和蛋氨酸标记的甾醇显示出强烈的抑制甾醇合成的作用，很可能是在斜叶草醇的C-14去甲基化阶段。生长抑制的程度与个别异构体抑制甾醇合成的效力有关。赤霉素合成的抑制似乎对生长迟缓没有那么重要。
Etiolated seedlings of wheat (Triticum aestivum L. cv. Jubilar) were treated with individual isomers of triadimenol in order to determine the biochemical basis for plant growth retardation. The Is, 2R isomer showed the highest activity as a plant growth retardant, followed by the 1R, 2s form. The inhibition of growth was not relieved by exogenous gibberellic acid suggesting a mode of action different from inhibition of gibberelln synthesis. Labelling of sterols with radioactive acetate and methionine demonstrated a strong inhibition of sterol synthesis, most likely at the step of C-14 demethylation of obtusifoliol. The extent of growth inhibition was accompanied with the potency of individual isomers to inhibit sterol synthesis. The inhibition of gibberellin synthesis appears of less importance for growth retardation.