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Physiological and transcriptional responses to salt stress in salt-tolerant and salt-sensitive soybean (Glycine max [L.] Merr.) seedlings

文献类型： 外文期刊

作者： Ning, Lihua 1 ; Kan, Guizhen 3 ; Shao, Hongbo 1 ; Yu, Deyue 3 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Salt Soil Agr Ctr, Nanjing 210014, Peoples R China

2.Yancheng Teachers Univ, Jiangsu Synthet Innovat Ctr Coastal Bioagr, Jiangsu Key Lab Bioresources Saline Soils, Yancheng 224002, Peoples R China

3.Nanjing Agr Univ, Natl Ctr Soybean Improvement, Natl Key Lab Crop Genet & Germplasm Enhancement, Nanjing 210095, Jiangsu, Peoples R China

关键词： gene expression; ion homeostasis; photosynthetic characteristics; salt-soil sustainable use; salt-tolerant soybean

期刊名称：LAND DEGRADATION & DEVELOPMENT （ 影响因子：4.977； 五年影响因子：5.291 ）

ISSN： 1085-3278

年卷期： 2018 年 29 卷 8 期

页码：

收录情况： SCI

摘要： Excess salinity is a major environmental threat to agriculture. However, the adaptive mechanisms underlying salt tolerance in soybean (Glycine max [L.] Merr.) remain unclear. The aim of this study was to investigate the differences between salt-tolerant and salt-sensitive soybeans in their physiological characteristics and the expression patterns of 8 cation antiporters under salt stress. The inhibitory effects of salt stress on growth and photosynthesis in salt-sensitive soybean were stronger than those in salt-tolerant soybean. The concentration of phosphate and most other ions in the seedlings significantly declined under a 150-mM-NaCl treatment. Relative K+, Mg2+, and P concentrations were significantly positively correlated with relative net photosynthetic rate. GmNHX1 (Glyma.10G158700) and GmNcl1 (Glyma.03g171500) had similar expression patterns in the salt-tolerant and salt-sensitive cultivars. Furthermore, a significant correlation was present between the transcript levels of these 2 genes and the Na+ concentration in soybean leaves. In addition to GmSALT3, which is the major gene in soybean for salt tolerance in previous studies, GmNHX1 and GmNcl1 may be associated with salt tolerance in soybean to some extent. The salt-tolerant cultivars in this study maintained higher K+, Mg2+, and P concentrations in the leaf and had higher photosynthetic rates than the salt-sensitive cultivar did under salt stress. These findings can provide theoretical references for the molecular breeding of salt-tolerant soybean and the sustainable use of saline soils.

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