期刊
PHYSIOLOGIA PLANTARUM
卷 171, 期 4, 页码 714-727出版社
WILEY
DOI: 10.1111/ppl.13250
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资金
- FAFU Science Fund for Distinguished Young Scholars [xjq201629]
- FAFU Science grant for innovation [CXZX2018119]
- Hong Kong Research Grants Council Area of Excellence Scheme [AoE/M403/16]
- Lo Kwee-Seong Biomedical Research Fund
- Innovation and Technology Commission
- China Postdoctoral Science Foundation [2014T70603]
- National Natural Science Foundation of China [31501232]
The study reveals that GmCHX20a and GmCHX1 may work complementally in coping with salt stress, by increasing Na+ uptake into the root and excluding Na+ from the root, addressing both osmotic stress and ionic stress.
Cation/H+-exchanger (CHX) perform diverse functions in plants, including being a part of the protective mechanisms to cope with salt stress. GmCHX1 has been previously identified as the causal gene in a major salt-tolerance quantitative trait locus (QTL) in soybean, but little is known about another close paralog, GmCHX20a, found in the same QTL. In this study, GmCHX20a was characterized along with GmCHX1. The expression patterns of the two genes and the direction of Na+ flux directed by overexpression of these two transporters are different, suggesting that they are functionally distinct. The ectopic expression of GmCHX20a led to an increase in salt sensitivity and osmotic tolerance, which was consistent with its role in increasing Na+ uptake into the root. Although this seems counter-intuitive, it may in fact be part of the mechanism by which soybean could counter act the effects of osmotic stress, which is commonly manifested in the initial stage of salinity stress. On the other hand, GmCHX1 from salt-tolerant soybean was shown to protect plants via Na+ exclusion under salt stress. Taken together these results suggest that GmCHX20a and GmCHX1 might work complementally through a concerted effort to address both osmotic stress and ionic stress as a result of elevated salinity.
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