Jasmonate (JA) plays a central role in plant response to wounding and is shown to have crosstalk with gibberellin (GA) and cytokinin (CTK). Nevertheless, a little attempt has been made in connecting JA with tolerant responses and determining its physiological role in such responses. Here, we investigated the possible role of JA in compensatory growth and photosynthesis of Lolium perenne under wounding stress. The results showed that wounding treatment successfully induced compensatory growth and photosynthesis. JA was induced upon wounding, while GA was downregulated. Meanwhile, CTK was upregulated in leaf blade, but downregulated in sheath. In wounded plants, the content of malondialdehyde (MDA) showed little increase, whereas antioxidant enzyme activities showed a statistically insignificant decrease except superoxide dismutase (SOD) in leaf blade and catalase (CAT) in leaf sheath, suggesting alternative antioxidant mechanisms upon wounding. Interestingly, JA treatment induced regrowth in clipped plants, but repressed growth in unclipped plants, and continuous treatment with JA also repressed regrowth in clipped plants, suggesting that the initial JA burst in plants upon wounding can induce growth in L. perenne response to wounding. In addition, JA and its inhibitor induced little changes in photosynthetic yield, displaying that JA was uncoupled from photosynthesis.

茉莉酸酯（JA）在植物对伤害的反应中起着核心作用，并表现出与赤霉素（GA）和细胞分裂素（CTK）的串扰。然而，在将JA与耐受性应答联系起来并确定其在此类应答中的生理作用方面，已经做了一些尝试。在这里，我们研究了JA在黑麦草补偿生长和光合作用中的可能作用。在受伤的压力下。结果表明，伤口处理成功诱导了代偿性生长和光合作用。受伤时可诱发JA，而GA则下调。同时，CTK在叶片中被上调，而在鞘中被下调。在受伤的植物中，丙二醛（MDA）的含量几乎没有增加，而抗氧化酶的活性却显示出统计学上的微不足道的降低，除了叶片中的超氧化物歧化酶（SOD）和叶鞘中的过氧化氢酶（CAT）外，暗示了受伤时的其他抗氧化机制。有趣的是，JA处理可在修剪的植物中诱导再生长，但会抑制未修剪的植物的生长，而JA的连续处理也可抑制修剪的植物中的再生长，这表明在受伤时植物最初的JA爆发可诱导黄瓜生长。L. perenne对受伤的反应。另外，JA及其抑制剂几乎不引起光合产量的变化，表明JA与光合作用是不相关的。