Molecular and physiological evidence of HvCaLB1 regulates calcium homeostasis and salt tolerance in Barley
文献类型： 外文期刊
作者： Tong, Tao 1 ; Zhang, Yanli 1 ; Zhou, Xueyi 2 ; Jiang, Wei 1 ; Chen, Guang 3 ; Zeng, Fanrong 1 ; Xue, Dawei 4 ; Chen, Zhong-Hua 5 ; Qin, Yuan 1 ; Deng, Fenglin 1 ;
作者机构： 1.Yangtze Univ, Coll Agr, MARA Key Lab Sustainable Crop Prod Middle Reaches, Coconstruct Minist & Prov, Jingzhou 434025, Peoples R China
2.Zhejiang Univ, Coll Agr & Biotechnol, Hangzhou, Peoples R China
3.Zhejiang Acad Agr Sci, Cent Lab, Hangzhou, Peoples R China
4.Hangzhou Normal Univ, Coll Life & Environm Sci, Hangzhou, Peoples R China
5.Western Sydney Univ, Sch Sci, Penrith, NSW, Australia
6.Western Sydney Univ, Hawkesbury Inst Environm, Penrith, NSW, Australia
关键词： Ca2+-binding domains; Evolutionary bioinformatics; Salinity; Ion homeostasis; Hordeum vulgare L. Ca2+-dependent lipid-binding
期刊名称：PLANT GROWTH REGULATION （ 影响因子：3.5； 五年影响因子：3.4 ）
ISSN： 0167-6903
年卷期： 2024 年
页码：
收录情况： SCI
摘要： The loss of crop productivity due to soil salinity is an increasing threat to agriculture worldwide. Calcium (Ca2+) plays vital roles in salt-responsive signaling through the perception of various calcium-binding proteins, such as Ca2+-dependent lipid-binding proteins (CaLBs). Here, CaLBs from barley (Hordeum vulgare), a moderate salt-tolerant crop, and other green plants were selected for evolutionary and bioinformatics analysis. The emergence of the CaLB1 and C2 domains could be traced back to green algae, such as the chlorophyte alga Uronema belka (Uronemataceae). The physiological roles of HvCaLB1 in the salt-tolerant barley accession CM72 were investigated through gene silencing induced by barley stripe mosaic virus. Knockdown of HvCaLB1 significantly and differentially impaired the performance of plant growth, photosynthetic, and chlorophyll fluorescence parameters under the treatments of 200 and 400 mM NaCl. Moreover, the knockdown of HvCaLB1 disrupted the homeostasis of essential elements, particularly in the significant decrease of root potassium (K+) and Ca2+ contents in HvCaLB1 silencing plants compared to the control plants in response to salt stress. Significantly increased accumulation of reactive oxygen species (ROS), reduced cytosolic Ca2+ levels, as well as the decreased expression of HvHVP10 (Vacuolar H+-pyrophosphatase 10) and HvCaM1 (Calmodulin 1), were observed in the roots of the HvCaLB1-silencing plants subjected to 400 mM NaCl treatment compared to those of control plants. Taken together, CaLBs represent an ancient group of Ca2+-binding domain-containing proteins, and HvCaLB1 regulates NaCl-induced ion, ROS homeostasis, and gene expression in barley roots, demonstrating the potential application of CaLBs for crop improvement with increased tolerance to salt stress.
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