期刊
PLANT SCIENCE
卷 234, 期 -, 页码 144-154出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2015.02.011
关键词
Gene expression; Halophyte; HKT1; Salicornia; Salt tolerance; SOS1
资金
- Dutch National Research Program: Knowledge for Climate [2.3.2]
- Zilte Kennis Kring [ZKK-1]
We investigated the effects of salinity on ion accumulation and expression of candidate salt tolerance genes in the highly tolerant salt accumulating halophyte Salicornia dolichostachya and the taxonomically related glycophytic Spinacia oleracea. S. dolichostachya, in comparison with S. oleracea, constitutively expressed SOS1 at a high level, but did not detectably express HKT1;1. These findings suggest that the constitutive high level of shoot salt accumulation in S. dolichostachya is accomplished through enhancement of SOS 1-mediated Na+ xylem loading, in combination with complete suppression of HKT1;1-mediated Na+ retrieval from the xylem. Our findings demonstrate the importance of gene expression comparisons between highly tolerant halophytes and taxonomically related glycophytes to improve the understanding of mechanisms of Na+ movement and salt tolerance in plants. (C) 2015 Elsevier Ireland Ltd. All rights reserved.
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