Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 192, Issue -, Pages 243-251Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2022.10.014
Keywords
Brachypodium distachyon; CIPK; Potassium deficiency; Nicotina tabacum; K plus utilization
Categories
Funding
- Natural Science Foundation of Hubei Province, China
- [2019CFB388]
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This study sheds light on the importance of potassium (K+) in plant growth and identifies a potential regulator, BdCIPK31, which enhances plant tolerance to low potassium stress and promotes potassium uptake and root growth. Additionally, BdCIPK31 mitigates oxidative damage caused by low potassium stress.
Potassium (K) is one of the most essential macronutrients for plants. However, K+ is deficient in some cultivated soils. Hence, improving the efficiencies of K+ uptake and utilization is important for agricultural production. Ca2+ signaling pathways play an important role in regulation of K+ acquisition. In the present study, BdCIPK31, a Calcineurin B-like protein interacting protein kinase (CIPK) from Brachypodium distachyon, was found to be a potential positive regulator in plant response to low K+ stress. The expression of BdCIPK31 was responsive to K+deficiency, and overexpression of BdCIPK31 conferred enhanced tolerance to low K+ stress in transgenic tobaccos. Furthermore, BdCIPK31 was demonstrated to promote the K+ uptake in root, and could maintain normal root growth under K+-deficiency conditions. Additionally, BdCIPK31 functioned in scavenging excess reactive oxygen species (ROS), reduced oxidative damage caused by low K+ stress. Collectively, our study indicates that BdCIPK31 is a vital regulatory component in K+-acquisition system in plants.
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