脱落酸
钙
调节器
磷酸化
激酶
耐旱性
转基因
干旱胁迫
化学
转基因作物
细胞生物学
生物物理学
生物
生物化学
植物
基因
有机化学
作者
Xiaoying Hu,Jinkui Cheng,Minmin Lu,Tingting Fang,Yujuan Zhu,Zhen Li,Qing Wang,Yu Wang,Yan Guo,Shuhua Yang,Zhizhong Gong
摘要
ABSTRACT Calcium oscillations are induced by different stresses. Calcium‐dependent protein kinases (CDPKs/CPKs) are one major group of the plant calcium decoders that are involved in various processes including drought response. Some CPKs are calcium‐independent. Here, we identified ZmCPK2 as a negative regulator of drought resistance by screening an overexpression transgenic maize pool. We found that ZmCPK2 does not bind calcium, and its activity is mainly inhibited during short term abscisic acid (ABA) treatment, and dynamically changed in prolonged treatment. Interestingly, ZmCPK2 interacts with and is inhibited by calcium‐dependent ZmCPK17, a positive regulator of drought resistance, which is activated by ABA. ZmCPK17 could prevent the nuclear localization of ZmCPK2 through phosphorylation of ZmCPK2T60. ZmCPK2 interacts with and phosphorylates and activates ZmYAB15, a negative transcriptional factor for drought resistance. Our results suggest that drought stress‐induced Ca 2+ can be decoded directly by ZmCPK17 that inhibits ZmCPK2, thereby promoting plant adaptation to water deficit.
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