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The outward Shaker channel OsK5.2 is beneficial to the plant salt tolerance through its role in K+ translocation and its control of leaf transpiration

Abstract : High soil salinity constitutes a major environmental constraint to crop production worldwide, and the identification of genetic determinants of plant salt tolerance is awaited by breeders. While the leaf K + to Na + homeostasis is considered as key parameter of plant salt tolerance, the underlying mechanisms are not fully identified. Especially, the contribution of K + channels to this homeostasis has been scarcely examined. Here, we show, using a reverse genetics approach, that the outwardly-rectifying K + channel OsK5.2, involved in K + translocation to the shoot and K + release by guard cells for stomatal closure, is a strong determinant of rice salt tolerance. Upon saline treatment, OsK5.2 function in xylem sap K + load was maintained, and even transiently increased, in roots. OsK5.2 selectively handled K + in roots and was not involved in xylem sap Na + load. In shoots, OsK5.2 expression was up-regulated from the onset of the saline treatment, enabling fast reduction of stomatal aperture, decreased transpirational water flow and therefore decreased transplant Na + flux and reduced leaf Na + accumulation. Thus, the OsK5.2 functions allowed shoot K + nutrition while minimizing arrival of Na + , and appeared highly beneficial to the leaf K + to Na + homeostasis, the avoidance of salt toxicity and plant growth maintaining.
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Preprints, Working Papers, ...
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https://hal.inrae.fr/hal-03246693
Contributor : Chantal Baracco <>
Submitted on : Wednesday, June 2, 2021 - 3:04:55 PM
Last modification on : Friday, June 4, 2021 - 10:17:16 AM

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Jing Zhou, Thanh Hao Nguyen, Doan Trung Luu, Hervé Sentenac, Anne-Aliénor Véry. The outward Shaker channel OsK5.2 is beneficial to the plant salt tolerance through its role in K+ translocation and its control of leaf transpiration. 2021. ⟨hal-03246693⟩

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