Xie Xiaonan, Yoneyama Kaori, Kisugi Takaya, Nomura Takahito, Akiyama Kohki, Asami Tadao, Yoneyama Koichi
Center for Bioscience Research and Education, Utsunomiya University, 350 Mine-machi, Utsunomiya, Tochigi 321-8505, Japan.
Department of Applied Life Sciences, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan.
J Pestic Sci. 2016 May 20;41(2):55-58. doi: 10.1584/jpestics.D16-009.
Strigolactones (SLs) are carotenoid-derived signaling molecules that mediate symbiotic and parasitic communications in the rhizosphere and plant hormones that regulate the growth and development of plants through crosstalk with other hormones. Natural SLs are classified into two groups based on the stereochemistry of the B-C ring junction. Rice and sorghum plants, both gramineous crops, produce orobanchol-type and strigol-type SLs, respectively, while tobacco plants produce both types. In the present study, we demonstrate that such species-specific phenomena in SL production also occur in the transport of exogenous SLs from roots to shoots. In rice plants, strigol-type SLs such as 5-deoxystrigol have been reported to actively inhibit tiller bud outgrowth, whereas root-applied strigol-type SLs could not be detected in shoots harvested 20 hr after treatment, indicating that metabolites of SLs or other signaling compounds downstream of SLs-but not SLs themselves-are the true inhibitors of tiller bud outgrowth.
独脚金内酯（SLs）是一类由类胡萝卜素衍生而来的信号分子，介导根际中的共生和寄生通讯，同时也是一类植物激素，可通过与其他激素相互作用来调节植物的生长发育。天然独脚金内酯根据B-C环连接的立体化学分为两类。水稻和高粱这两种禾本科作物，分别产生列当醇型和独脚金型独脚金内酯，而烟草植物则同时产生这两种类型。在本研究中，我们证明独脚金内酯产生的这种物种特异性现象在外源独脚金内酯从根向地上部的运输中也会发生。在水稻植株中，据报道，独脚金型独脚金内酯如5-脱氧独脚金醇可积极抑制分蘖芽的生长，而在处理后20小时收获的地上部中未检测到根施的独脚金型独脚金内酯，这表明独脚金内酯的代谢产物或独脚金内酯下游的其他信号化合物——而非独脚金内酯本身——才是分蘖芽生长的真正抑制剂。
