Zhao Wenchao, Liang Jingjing, Huang Huang, Yang Jinshan, Feng Jiaping, Sun Lulu, Yang Rui, Zhao Mengjia, Wang Jianli, Wang Shaohui
College of Plant Science and Technology, Beijing University of Agriculture, No. 7 Beinong Road, Changping District, Beijing, 102206, China.
Beijing Key Laboratory for Agricultural Application and New Technique, Beijing University of Agriculture, Beijing, 102206, China.
New Phytol. 2023 May;238(4):1651-1670. doi: 10.1111/nph.18837. Epub 2023 Mar 18.
Jasmonic acid (JA) is involved in the modulation of defence and growth activities in plants. The best-characterized growth-defence trade-offs stem from antagonistic crosstalk among hormones. In this study, we first confirmed that JA negatively regulates root-knot nematode (RKN) susceptibility via the root exudates (REs) of tomato plants. Omics and toxicological analyses implied that kaempferol, a type of flavonol, from REs has a negative effect on RKN infection. We demonstrated that SlMYB57 negatively regulated kaempferol contents in tomato roots, whereas SlMYB108/112 had the opposite effect. We revealed that JA fine-tuned the homeostasis of kaempferol via SlMYB-mediated transcriptional regulation and the interaction between SlJAZs and SlMYBs, thus ensuring a balance between lateral root (LR) development and RKN susceptibility. Overall, this work provides novel insights into JA-modulated LR development and RKN susceptibility mechanisms and elucidates a trade-off model mediated by JA in plants encountering stress.
茉莉酸（JA）参与植物防御和生长活动的调节。最具特征的生长-防御权衡源于激素之间的拮抗串扰。在本研究中，我们首先证实JA通过番茄植株的根系分泌物（REs）负向调节根结线虫（RKN）易感性。组学和毒理学分析表明，REs中的一种黄酮醇山奈酚对RKN感染有负面影响。我们证明SlMYB57负向调节番茄根中山奈酚含量，而SlMYB108/112则有相反作用。我们揭示JA通过SlMYB介导的转录调控以及SlJAZs与SlMYBs之间的相互作用微调山奈酚的稳态，从而确保侧根（LR）发育与RKN易感性之间的平衡。总体而言，这项工作为JA调节的LR发育和RKN易感性机制提供了新见解，并阐明了JA在植物遭遇胁迫时介导的一种权衡模型。
