Plants are frequently exposed to herbivory and mechanical damage that result in wounding. Two fundamental strategies, regeneration and healing, are employed by plants upon wounding. How plants make different decisions and how wound healing is sustained until the damaged tissues recover are not fully understood. In this study, we found that local auxin accumulation patterns, determined by wounding modes, may activate different recovery programs in wounded tissues. Wounding triggers transient jasmonic acid (JA) signaling that promotes lignin deposition in the first few hours after wounding occurs. This early response is subsequently relayed to ABA signaling via MYC2. The induced JA signaling promotes ABA biosynthesis to maintain the expression of RAP2.6, a key factor for sustained lignin biosynthesis and the later wound-healing process. Our findings provide mechanistic insights into how plants heal from wounding and clarify the molecular mechanisms that underlie the prolonged healing process following wounding.

中文翻译：

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JA-to-ABA 信号转导促进拟南芥伤口愈合的木质素沉积


植物经常暴露在食草和机械损伤中，从而导致受伤。植物在受伤时采用两种基本策略，再生和愈合。植物如何做出不同的决定以及如何维持伤口愈合直到受损组织恢复尚不完全清楚。在这项研究中，我们发现由损伤模式决定的局部生长素积累模式可能会激活受伤组织中不同的恢复程序。受伤会触发瞬时茉莉酸 （JA） 信号传导，在受伤后的最初几个小时内促进木质素沉积。这种早期反应随后通过 MYC2 传递到 ABA 信号转导。诱导的 JA 信号传导促进 ABA 生物合成以维持 RAP2.6 的表达，RAP2.6 是持续木质素生物合成和后期伤口愈合过程的关键因素。我们的研究结果为植物如何从受伤中愈合提供了机制见解，并阐明了受伤后延长愈合过程的分子机制。