Tsinghua-Peking Center for Life Sciences, School of Life Sciences, Tsinghua University, Beijing, 100084, China.
Shenzhen Branch, Guangdong Laboratory for Lingnan Modern Agriculture, Genome Analysis Laboratory of the Ministry of Agriculture, Agricultural Genomics Institute at Shenzhen, Chinese Academy of Agricultural Sciences, Shenzhen, 518124, China.
Sci China Life Sci. 2021 Aug;64(8):1215-1226. doi: 10.1007/s11427-020-1899-8. Epub 2021 Mar 25.
Seed size, an important agronomic trait determining crop yield, is regulated by multiple plant hormones. Jasmonate (JA) is a key phytohormone required for various plant defenses and diverse developmental processes. Here, we defined an essential role for JA in control of seed size. Through comprehensive analysis of genetic mutants in JA pathway, we showed that seed size was repressed by positive components in JA pathway including COI1, MYC2 (and its homologues), MED25 and JAR1, but promoted by JA signaling repressor JAZ proteins such as JAZ6. We further demonstrated that exogenous application of JA suppressed seed size in a COI1-dependent manner. Our results reveal that JA signaling represses seed size and negatively regulates integument cell proliferation. Elucidation of jasmonate action in seed size control would advance our understanding of inner mechanism of seed size regulation.
种子大小是决定作物产量的一个重要农艺性状，它受到多种植物激素的调控。茉莉酸（JA）是各种植物防御和多种发育过程所必需的关键植物激素。在这里，我们确定了 JA 在控制种子大小方面的重要作用。通过对 JA 途径中遗传突变体的综合分析，我们表明种子大小受到 JA 途径中包括 COI1、MYC2（及其同源物）、MED25 和 JAR1 在内的正调控成分的抑制，但受到 JA 信号抑制剂 JAZ 蛋白如 JAZ6 的促进。我们进一步证明，外源 JA 的应用以 COI1 依赖的方式抑制种子大小。我们的研究结果揭示了 JA 信号抑制种子大小并负调控种皮细胞增殖。阐明茉莉酸在种子大小调控中的作用将有助于我们深入了解种子大小调控的内在机制。
