Calcium-dependent protein kinase GhCDPK4 plays a role in drought and abscisic acid stress responses

• Published in: Plant science (Limerick) 2023-07, Vol.332, p.111704-111704, Article 111704
• Main Authors: Kong, Hui, Hou, Mengjuan, Ma, Bin, Xie, Zhaosong, Wang, Jiameng, Zhu, Xinxia
• Format: Article
• Language: English
• Subjects: ABA signaling; Abscisic Acid - metabolism; Antioxidants - metabolism; Cotton; Drought stress; Droughts; Gene Expression Regulation, Plant; GhCDPK4; Hydrogen Peroxide - metabolism; Overexpression; Plant Proteins - genetics; Plant Proteins - metabolism; Plants, Genetically Modified - metabolism; Stress, Physiological - genetics; Virus-induced silencing; Water - metabolism
• ISSN: 0168-9452; 1873-2259
• DOI: 10.1016/j.plantsci.2023.111704

Drought is an important factor limiting the yield and quality of cotton. In the present study, the gene encoding the cotton calcium-dependent protein kinase GhCDPK4 was identified and characterized in the transcriptome of cotton under PEG-induced drought stress. In RT-qPCR experiments, GhCDPK4 expression was found to be up-regulated under drought and abscisic acid (ABA) stress. Under drought conditions, heterologous overexpression of GhCDPK4 in tobacco showed a better phenotypic status, higher antioxidant enzyme activity, and lower relative electrolyte leakage (REL) and malondialdehyde (MDA) content. Meanwhile, ghcdpk4-silenced cotton plants, which were extremely sensitive to drought, exhibited higher levels of O2-，H2O2, and MDA contents compared to the control. Meanwhile, silenced lines showed impaired stomatal closure under drought stress, resulting in increased water loss from transpiration in silenced lines. GhCDPK4 expression was induced by ABA, and there are five ABA-responsive elements in its promoter. and C2-DOMAIN ABA-RELATED 4(CAR4, Gh_D09G1653) were found to interact and be co-expressed in the GhCDPK4 interaction network. Therefore, GhCDPK4 may reduce the extent of water loss and oxidative damage in cotton under drought by positively regulating ABA-controlled stomatal closure and reactive oxygen species (ROS) scavenging systems. This study demonstrates the great potential of GhCDPK4 in improving drought resistance in crops. •GhCDPK4 was induced by PEG6000 and increased drought tolerance in tobacco.•GhCDPK4-silenced cotton plants, which are extremely sensitive to drought, showed increased oxidative damage in leaf cells.•GhCDPK4 was induced to be expressed by ABA, and five ABA-responsive elements were present in the promoter.•GhCDPK4 plays an important role in ABA-controlled stomatal closure process and ROS scavenging system.