Site of action of chlorsulfuron: inhibition of valine and isoleucine biosynthesis in plants

The sulfonylurea herbicide chlorsulfuron blocks the biosynthesis of the amino acids valine and isoleucine in plants. Addition of these two amino acids to excised pea root (Pisum sativum L. var Alaska) cultures incubated in the presence of chlorsulfuron completely alleviates herbicide-induced growth inhibition. The site of action of chlorsulfuron is the enzyme acetolactate synthase which catalyzes the first step in the biosynthesis of valine and isoleucine. This enzyme is extremely sensitive to inhibition by chlorsulfuron having I₅₀ values ranging from 18 to 36 nanomolar. In addition, acetolactate synthase from a wide variety of tolerant and sensitive plants species is highly sensitive to inhibition by chlorsulfuron.     

绿豆的化学成分研究

首次从常用食品绿豆（Phaseolus radiatus L．）中分离得到7个已知化合物,通过波谱解析等方法确定其结构为：7-甲氧基牡荆素（1）,硬脂酸（2）,1-硬脂酸甘油脂（3）,色氨酸（4）,尿嘧啶核苷（5）,β-谷甾醇（6）和胡萝卜苷（7）。