Exogenous Kinetin Modulates ROS Homeostasis to Affect Heat Tolerance in Rice Seedlings

作者：Wentao Mei, Wenjuan Chen, Yingfeng Wang, Zeyun Liu, Yating Dong, Guilian Zhang, Huabing Deng, Xiong Liu, Xuedan Lu, Feng Wang, Guihua Chen, Wenbang Tang, Yunhua Xiao · 发表于：International Journal of Molecular Sciences · 年份：2023 · DOI：10.3390/ijms24076252 · 被引用次数：37 · 研究领域：Plant Stress Responses and Tolerance、Plant responses to elevated CO2、Plant Water Relations and Carbon Dynamics

Heat stress caused by rapidly changing climate warming has become a serious threat to crop growth worldwide. Exogenous cytokinin (CK) kinetin (KT) has been shown to have positive effects in improving salt and drought tolerance in plants. However, the mechanism of KT in heat tolerance in rice is poorly understood. Here, we found that exogenously adequate application of KT improved the heat stress tolerance of rice seedlings, with the best effect observed when the application concentration was 10−9 M. In addition, exogenous application of 10−9 M KT promoted the expression of CK-responsive OsRR genes, reduced membrane damage and reactive oxygen species (ROS) accumulation in rice, and increased the activity of antioxidant enzymes. Meanwhile, exogenous 10−9 M KT treatment significantly enhanced the expression of antioxidant enzymes, heat activation, and defense-related genes. In conclusion, exogenous KT treatment regulates heat tolerance in rice seedlings by modulating the dynamic balance of ROS in plants under heat stress.