Xiang Shengyuan, Wu Songguo, Jing Yifen, Chen Ligang, Yu Diqiu
CAS Key Laboratory of Tropical Plant Resources and Sustainable Use, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Menglun, Mengla, Yunnan, 666303, China.
University of Chinese Academy of Sciences, Beijing, 100049, China.
Plant Divers. 2021 Feb 6;44(1):109-115. doi: 10.1016/j.pld.2021.01.007. eCollection 2022 Jan.
The phytochrome B mediated light signaling integrates with various phytohormone signalings to control plant immune response. However, it is still unclear whether phyB-mediated light signaling has an effect on the biosynthesis of jasmonate during plant defense response against . In this study, we demonstrated that phyB-mediated light signaling has a role in this process. Initially, we confirmed that plants were obviously less resistant to while overexpressing plants showed significantly enhanced resistance. We also found that the expression of numerous JA biosynthesis genes was promoted upon treatment with red or white light when compared to that of darkness, and that this promotion is dependent on phyB. Consistent with the gene expression results, plants accumulated reduced pool of JA-Ile, indicating that phyB-mediated light signaling indeed increased JA biosynthesis. Further genetic analysis showed that light-mediated JAZ9 degradation and phyB-enhanced resistance were dependent on the receptor COI1, and that () can largely rescue the severe symptom of . Taken together, our study demonstrates that phyB may participate in plant defense against through the modulation of the biosynthesis of JA.
光敏色素B介导的光信号与多种植物激素信号整合，以控制植物的免疫反应。然而，在植物对……的防御反应过程中，光敏色素B介导的光信号是否对茉莉酸的生物合成有影响仍不清楚。在本研究中，我们证明了光敏色素B介导的光信号在此过程中发挥作用。首先，我们证实……植物对……的抗性明显较低，而过表达……的植物表现出显著增强的抗性。我们还发现，与黑暗处理相比，用红光或白光处理后，许多茉莉酸生物合成基因的表达受到促进，且这种促进依赖于光敏色素B。与基因表达结果一致，……植物中茉莉酸异亮氨酸的积累量减少，表明光敏色素B介导的光信号确实增加了茉莉酸的生物合成。进一步的遗传分析表明，光介导的JAZ9降解和光敏色素B增强的抗性依赖于受体COI1，并且……（……）可以在很大程度上挽救……的严重症状。综上所述，我们的研究表明，光敏色素B可能通过调节茉莉酸的生物合成参与植物对……的防御。
