Beijing Key Laboratory for Agricultural Application and New Technique, College of Plant Science and Technology, Beijing University of Agriculture, Beijing 102206, China.
State Key Laboratory of Plant Physiology and Biochemistry, College of Biological Sciences, China Agricultural University, Beijing 100193, China.
Int J Mol Sci. 2022 Sep 2;23(17):10049. doi: 10.3390/ijms231710049.
Low temperature is an important environmental factor limiting the widespread planting of tropical and subtropical crops. The application of plant regulator coronatine, which is an analog of Jasmonic acid (JA), is an effective approach to enhancing crop's resistance to chilling stress and other abiotic stresses. However, the function and mechanism of coronatine in promoting chilling resistance of tomato is unknown. In this study, coronatine treatment was demonstrated to significantly increase tomato chilling tolerance. Coronatine increases H3K4me3 modifications to make greater chromatin accessibility in multiple chilling-activated genes. Corresponding to that, the expression of , other chilling-responsive transcription factor (TF) genes, and JA-responsive genes is significantly induced by coronatine to trigger an extensive transcriptional reprogramming, thus resulting in a comprehensive chilling adaptation. These results indicate that coronatine enhances the chilling tolerance of tomato plants by inducing epigenetic adaptations and transcriptional reprogramming.
低温是限制热带和亚热带作物广泛种植的重要环境因素。植物调节剂冠菌素是茉莉酸（JA）的类似物，它的应用是提高作物抗冷胁迫和其他非生物胁迫能力的有效方法。然而，冠菌素促进番茄抗冷性的功能和机制尚不清楚。在本研究中，发现冠菌素处理显著提高了番茄的抗冷性。冠菌素增加 H3K4me3 修饰，使多个冷激活基因的染色质可及性增加。相应地，冠菌素显著诱导了 、其他冷响应转录因子（TF）基因和 JA 响应基因的表达，从而触发广泛的转录重编程，最终导致全面的冷适应。这些结果表明，冠菌素通过诱导表观遗传适应和转录重编程来增强番茄植株的抗冷性。
