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Type: Journal article
Title: GmSALT3, which confers improved soybean salt tolerance in the field, increases leaf Cl⁻ exclusion prior to Na⁺ exclusion but does not improve early vigor under salinity
Other Titles: GmSALT3, which confers improved soybean salt tolerance in the field, increases leaf Cl(-) exclusion prior to Na(+) exclusion but does not improve early vigor under salinity
Author: Liu, Y.
Yu, L.
Qu, Y.
Chen, J.
Liu, X.
Hong, H.
Liu, Z.
Chang, R.
Gilliham, M.
Qiu, L.
Guan, R.
Citation: Frontiers in Plant Science, 2016; 7(September2016):1485-1-1485-14
Publisher: Frontiers Media
Issue Date: 2016
ISSN: 1664-462X
Statement of
Ying Liu, Lili Yu, Yue Qu, Jingjing Chen, Xiexiang Liu, Huilong Hong, Zhangxiong Liu, Ruzhen Chang, Matthew Gilliham, Lijuan Qiu and Rongxia Guan
Abstract: Soil salinity reduces soybean growth and yield. The recently identified GmSALT3 (Glycine max salt Tolerance-associated gene on chromosome 3) has the potential to improve soybean yields in salinized conditions. Here we evaluate the impact of GmSALT3 on soybean performance under saline or non-saline conditions. Three sets of near isogenic lines (NILs), with genetic similarity of 95.6-99.3% between each pair of NIL-T and NIL-S, were generated from a cross between two varieties 85-140 (salt-sensitive, S) and Tiefeng 8 (salt-tolerant, T) by using marker-assisted selection. Each NIL-T; 782-T, 820-T and 860-T, contained a common ~1000 kb fragment on chromosome 3 where GmSALT3 was located. We show that GmSALT3 does not contribute to an improvement in seedling emergence rate or early vigor under salt stress. However, when 12-day-old seedlings were exposed to NaCl stress, the NIL-T lines accumulated significantly less leaf Na(+) compared with their corresponding NIL-S, while no significant difference of K(+) concentration was observed between NIL-T and NIL-S; the magnitude of Na(+) accumulation within each NIL-T set was influenced by the different genetic backgrounds. In addition, NIL-T lines accumulated less Cl(-) in the leaf and more in the root prior to any difference in Na(+); in the field they accumulated less pod wall Cl(-) than the corresponding NIL-S lines. Under non-saline field conditions, no significant differences were observed for yield related traits within each pair of NIL-T and NIL-S lines, indicating there was no yield penalty for having the GmSALT3 gene. In contrast, under saline field conditions the NIL-T lines had significantly greater plant seed weight and 100-seed weight than the corresponding NIL-S lines, meaning GmSALT3 conferred a yield advantage to soybean plants in salinized fields. Our results indicated that GmSALT3 mediated regulation of both Na(+) and Cl(-) accumulation in soybean, and contributes to improved soybean yield through maintaining a higher seed weight under saline stress.
Keywords: soybean; salt tolerance; near isogenic line; sodium; chloride; GmSALT3; salt exclusion
Description: Published: 30 September 2016
Rights: Copyright © 2016 Liu, Yu, Qu, Chen, Liu, Hong, Liu, Chang, Gilliham, Qiu and Guan. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
DOI: 10.3389/fpls.2016.01485
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Appears in Collections:Agriculture, Food and Wine publications
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