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Ca^(2+)signaling in plant responses to abiotic stresses

Journal of Integrative Plant Biology 2022年第2期64卷 287-300页

作者： Qiuyan Dong lukas wallrad Bader O.Almutairi Jörg Kudla Institute of Plant Biology and Biotechnology WWU MünsterSchlossplatz 7Münster48149 Germany Department of Zoology College of ScienceKing Saud UniversityRiyadhKingdom of Saudi Arabia

Adverse variations of abiotic environmental cues that deviate from an optimal range impose stresses to *** stresses severely impede plant physiology and ***,such stresses dramatically reduce crop yield and negatively impact on ecosystem stability and *** components of abiotic stresses can be,for example,suboptimal temperature and osmotic perturbations,while representative chemical facets of abiotic stresses can be toxic ions or suboptimal nutrient *** sheer complexity of abiotic stresses causes a multitude of diverse components and mechanisms for their sensing and signal ***^(2+),as a versatile second messenger,plays multifaceted roles in almost all abiotic stress responses in that,for a certain abiotic stress,Ca^(2+)is not only reciprocally connected with its perception,but also multifunctionally ensures subsequent signal ***,we will focus on salt/osmotic stress and responses to altered nutrient availability as model cases to detail novel insights into the identity of components that link stress perception to Ca^(2+)signal formation as well as on new insights into mechanisms of Ca^(2+)signal ***,we will deduce emerging conceptual consequences of these novel insights and outline arising avenues of future research on the role of Ca^(2+)signaling in abiotic stress responses in plants.

关键词： abiotic stress calcium signaling nutrient stress salt stress

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Ca^(2+)-dependent successive phosphorylation of vacuolar transporter MTP8 by CBL2/3-CIPK3/9/26 and CPK5 is critical for manganese homeostasis in Arabidopsis

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Molecular Plant 2022年第3期15卷 419-437页

作者： Chuanfeng Ju Zhenqian Zhang Jinping Deng Cuicui Miao Zhangqing Wang lukas wallrad Laiba Javed Dali Fu Ting Zhang Jörg Kudla Zhizhong Gong Cun Wang State Key Laboratory of Crop Stress Biology for Arid Areas College of Life Sciencesand Institute of Future AgricultureNorthwest Agriculture&Forestry UniversityYanglingShaanxi 712100China State Key Laboratory of Plant Physiology and Biochemistry College of Biological SciencesChina Agricultural UniversityBeijing 100193China Institut fur Biologie und Biotechnologie der Pflanzen Westfälische Wilhelms-Universität48149 MünsterGermany College of Life Sciences Hebei UniversityBaodingChina

Manganese(Mn)is an essential micronutrient for all living ***,excess Mn supply that can occur in acid or waterlogged soils has toxic effects on plant physiology and *** a variety of Mn transporter families have been characterized,we have only a rudimentary understanding of how these transporters are regulated to uphold and adjust Mn homeostasis in ***,we demonstrate that two calcineurin-B-like proteins,CBL2/3,and their interacting kinases,CIPK3/9/26,are key regulators of plant Mn *** mutants lacking CBL2 and 3 or their interacting protein kinases CIPK3/9/26 exhibit remarkably high Mn ***,CIPK3/9/26 interact with and phosphorylate the tonoplast-localized Mn and iron(Fe)transporter MTP8 primarily at Ser35,which is conserved among MTP8 proteins from various *** transport complementation assays in yeast combined with multiple physiological assays indicate that CBL-CIPK-mediated phosphorylation of MTP8 negatively regulates its transport activity from the cytoplasm to the ***,we show that sequential phosphorylation of MTP8,initially at Ser31/32 by the calcium-dependent protein kinase CPK5 and subsequently at Ser35 by CIPK26,provides an activation/deactivation fine-tuning mechanism for differential regulation of Mn ***,our findings define a two-tiered calcium-controlled mechanism for dynamic regulation of Mn homeostasis under conditions of fluctuating Mn supply.

关键词： manganese Ca^(2+) calcineurin B-like proteins(CBLs) CBL-interacting protein kinases(CIPKs) Mn transporter MTP8 calcium-dependent protein kinases(CPKs)

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