独脚金内酯合成路径及抗逆性研究进展

独脚金内酯(strigolactone,SL)是一类萜内酯,来源于类胡萝卜素生物合成途径,是通过一系列的酶促反应合成的。但关于独脚金内酯的生物合成路径尚未研究透彻,目前已经了解到D27蛋白、CCD7蛋白、CCD8蛋白、P450蛋白在这一过程中发挥着不可忽视的作用。现已从豌豆、水稻、矮牵牛、拟南芥等多分枝突变体中克隆得到多个与SL合成、传导途径相关的基因。其中,D27、CCD7和CCD8是独脚金内酯合成途径的上游基因,经过双加氧和脱氢,最后在MAX1的作用下生成了5-脱氧独脚金醇。独脚金内酯是一类新型激素,能够诱导根寄生植物种子萌发并且加快丛枝真菌出现分枝,有着阻碍植物分枝生长的作用,从而抵御各种胁迫,对植物的生长具有重要意义。

Research Progress of Synthetic Pathway and Stress Resistance of Strigolactone

Strigolactones (SLs) are terpenoid lactone, which came from carotenoid biosynthetic pathway, completed by a series of enzymatic reactions. The SLs biosynthesis was still not unclear, but, research found that D27,CCD7,CCD8 and P450 proteins play a important role. Nowadays, some genes related to SLs biosynthesis and signaling pathways were cloned from high-tillering mutants from different plant species such as rice, arabidopsis, petunia and pea. D27, CCD7 and CCD8 are responsible for the upstream pathway, after double oxygenation and dehydrogenation, MAX1 begins to generate 5-deoxystrigol, finally. As a new type of plant hormone, SLs can inhibit plant branching, induce seed germination of root parasitism, and stimulate hyphal branching in arbuscular mycorrhizal fungi (AMF), having an ability to resist different kinds of stresses, which is of great significance to the growth of plants.