Ito Shinsaku, Yamagami Daichi, Umehara Mikihisa, Hanada Atsushi, Yoshida Satoko, Sasaki Yasuyuki, Yajima Shunsuke, Kyozuka Junko, Ueguchi-Tanaka Miyako, Matsuoka Makoto, Shirasu Ken, Yamaguchi Shinjiro, Asami Tadao
Department of Bioscience, Faculty of Applied Bioscience, Tokyo University of Agriculture, Setagaya, Tokyo 156-8502, Japan (S.I., Y.S., Shu.Y.).
Department of Applied Biological Chemistry, The University of Tokyo, Bunkyo, Tokyo 113-8657, Japan (S.I., D.Y., T.A.).
Plant Physiol. 2017 Jun;174(2):1250-1259. doi: 10.1104/pp.17.00301. Epub 2017 Apr 12.
Strigolactones (SLs) are a class of plant hormones that regulate diverse physiological processes, including shoot branching and root development. They also act as rhizosphere signaling molecules to stimulate the germination of root parasitic weeds and the branching of arbuscular mycorrhizal fungi. Although various types of cross talk between SLs and other hormones have been reported in physiological analyses, the cross talk between gibberellin (GA) and SLs is poorly understood. We screened for chemicals that regulate the level of SLs in rice () and identified GA as, to our knowledge, a novel SL-regulating molecule. The regulation of SL biosynthesis by GA is dependent on the GA receptor GID1 and F-box protein GID2. GA treatment also reduced the infection of rice plants by the parasitic plant witchers weed (). These data not only demonstrate, to our knowledge, the novel plant hormone cross talk between SL and GA, but also suggest that GA can be used to control parasitic weed infections.
独脚金内酯（SLs）是一类植物激素，可调节多种生理过程，包括枝条分枝和根系发育。它们还作为根际信号分子，刺激根寄生杂草的萌发和丛枝菌根真菌的分枝。尽管在生理分析中已报道了SLs与其他激素之间的各种类型的相互作用，但赤霉素（GA）与SLs之间的相互作用却知之甚少。我们筛选了调节水稻中SLs水平的化学物质，并确定GA是一种据我们所知的新型SL调节分子。GA对SL生物合成的调节依赖于GA受体GID1和F-box蛋白GID2。GA处理还减少了寄生植物菟丝子对水稻植株的侵染。这些数据不仅据我们所知证明了SL和GA之间新型的植物激素相互作用，还表明GA可用于控制寄生杂草的侵染。
