College of Horticulture, Anhui Agricultural University, Hefei 230000, China.
College of Life Sciences, College of Horticulture, Haixia Institute of Science and Technology, Fujian Agriculture and Forestry University, Fuzhou 350002, China.
Mol Plant. 2024 Oct 7;17(10):1594-1605. doi: 10.1016/j.molp.2024.09.003. Epub 2024 Sep 17.
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.
植物经常受到食草动物和机械损伤的影响，导致受伤。受伤后，植物采用两种基本策略进行再生和愈合。然而，植物如何做出不同的决策以及如何在受损组织恢复之前维持伤口愈合，这些问题尚未得到充分理解。在本研究中，我们发现，由创伤模式决定的局部生长素积累模式可能会在受伤组织中激活不同的恢复程序。创伤会触发短暂的茉莉酸（JA）信号转导，促进创伤发生后最初几个小时内木质素的沉积。这种早期反应随后通过 MYC2 传递到 ABA 信号转导途径。诱导的 JA 信号转导促进 ABA 的生物合成，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。我们的研究结果提供了关于植物如何从创伤中恢复的机制见解，并阐明了创伤后延长愈合过程的分子机制。
