RIKEN Center for Sustainable Resource Science, Yokohama, Kanagawa, Japan.
Graduate School of Science, the University of Tokyo, Tokyo, Japan.
Plant Signal Behav. 2022 Dec 31;17(1):2114647. doi: 10.1080/15592324.2022.2114647.
Root parasitic plants in the family Orobanchaceae, such as and spp., infest major crops worldwide, leading to a multibillion-dollar loss annually. Host-derived strigolactones (SLs), recognized by a group of α/β hydrolase receptors (KAI2d) in these parasites, are important determinants for germinating root parasitic plants near the roots of host plants. , a facultative hemiparasitic Orobanchaceae plant, can germinate and grow in the presence or absence of the host and can also exhibit root chemotropism to host-derived SLs that are perceived via KAI2d. However, the importance of SLs in germination remains unclear. In this study, we found that germination of was suppressed in the absence of nitrate ions and that germination of was promoted by exogenous strigol, an SL, under such conditions. We propose a model in which may select either independent living or parasitism in response to ambient nitrogen conditions and host presence.
列当科的根寄生植物，如列当属和肉苁蓉属的种，在全世界范围内侵袭主要作物，导致每年数十亿美元的损失。寄主衍生的独脚金内酯（SLs）被这些寄生虫中的一组 α/β 水解酶受体（KAI2d）识别，是在寄主植物根部附近萌发根寄生植物的重要决定因素。肉苁蓉，一种兼性半寄生列当科植物，在有或没有寄主的情况下都可以发芽和生长，并且也可以对寄主衍生的 SLs 表现出根向性，这些 SLs 通过 KAI2d 被感知。然而，SLs 在肉苁蓉发芽中的重要性尚不清楚。在这项研究中，我们发现，在没有硝酸盐离子的情况下，肉苁蓉的发芽受到抑制，而在这种条件下，外源独脚金内酯（一种 SL）促进了肉苁蓉的发芽。我们提出了一个模型，即肉苁蓉可能会根据环境氮条件和寄主的存在选择独立生存或寄生。
