期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 21, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/ijms21144882
关键词
salinity stress; xylem loading; sodium; potassium; SKC1; HAK5; GORK; RBOHD; epidermis; stele
资金
- China National Natural Science Foundation [31961143001, 31870249]
- Australian Department of Industry, Innovation and Science [AISRF48490]
- Indo-Australian Biotechnology Fund - Department of Biotechnology, Government of India [BT/Indo-Aus/09/03/2015]
- Australian Research Council [DE170100346]
- JSPS KAKENHI [JP 17KK0152]
- Australian Research Council [DE170100346] Funding Source: Australian Research Council
In rice, theOsHKT1;5gene has been reported to be a critical determinant of salt tolerance. This gene is harbored by theSKC1locus, and its role was attributed to Na(+)unloading from the xylem. No direct evidence, however, was provided in previous studies. Also, the reported function ofSKC1on the loading and delivery of K(+)to the shoot remains to be explained. In this work, we used an electrophysiological approach to compare the kinetics of Na(+)uptake by root xylem parenchyma cells using wild type (WT) and NIL(SKC1) plants. Our data showed that Na(+)reabsorption was observed in WT, but not NIL(SKC1) plants, thus questioning the functional role ofHKT1;5as a transporter operating in the direct Na(+)removal from the xylem. Instead, changes in the expression level ofHKT1;5altered the activity of membrane transporters involved in K(+)and Ca(2+)acquisition and homeostasis in the rice epidermis and stele, explaining the observed phenotype. We conclude that the role ofHKT1;5in plant salinity tolerance cannot be attributed to merely reducing Na(+)concentration in the xylem sap but triggers a complex feedback regulation of activities of other transporters involved in the maintenance of plant ionic homeostasis and signaling under stress conditions.
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