The Complex Fine-Tuning of K+ Fluxes in Plants in Relation to Osmotic and Ionic Abiotic Stresses

被引:43
作者
Cherel, Isabelle [1 ]
Gaillard, Isabelle [1 ]
机构
[1] Univ Montpellier, BPMP, CNRS, INRA,SupAgro, Montpellier, France
关键词
plants; abiotic stress; abscisic acid; potassium transport regulation; INTERACTING PROTEIN-KINASE; B-LIKE PROTEINS; ACID SIGNAL-TRANSDUCTION; AKT1 POTASSIUM CHANNEL; ABSCISIC-ACID; GUARD-CELL; CALCIUM SENSOR; ANION CHANNEL; ARABIDOPSIS-THALIANA; STOMATAL CLOSURE;
D O I
10.3390/ijms20030715
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
As the main cation in plant cells, potassium plays an essential role in adaptive responses, especially through its involvement in osmotic pressure and membrane potential adjustments. K+ homeostasis must, therefore, be finely controlled. As a result of different abiotic stresses, especially those resulting from global warming, K+ fluxes and plant distribution of this ion are disturbed. The hormone abscisic acid (ABA) is a key player in responses to these climate stresses. It triggers signaling cascades that ultimately lead to modulation of the activities of K+ channels and transporters. After a brief overview of transcriptional changes induced by abiotic stresses, this review deals with the post-translational molecular mechanisms in different plant organs, in Arabidopsis and species of agronomical interest, triggering changes in K+ uptake from the soil, K+ transport and accumulation throughout the plant, and stomatal regulation. These modifications involve phosphorylation/dephosphorylation mechanisms, modifications of targeting, and interactions with regulatory partner proteins. Interestingly, many signaling pathways are common to K+ and Cl-/NO3(-) counter-ion transport systems. These cross-talks are also addressed.
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页数:31
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