Sodium extrusion associated with enhanced expression of SOS1 underlies different salt tolerance between Medicago falcata and Medicago truncatula seedlings

doi:10.1016/j.envexpbot.2014.09.005

	Sodium extrusion associated with enhanced expression of SOS1 underlies different salt tolerance between Medicago falcata and Medicago truncatula seedlings
	Liu, Min 1; Wang, Tian-Zuo ; Zhang, Wen-Hao
	2015
发表期刊	ENVIRONMENTAL AND EXPERIMENTAL BOTANY
ISSN	0098-8472
卷号	110 页码:46-55
摘要	Medicago falcata L is a perennial legume species native to semiarid grasslands in northern China, and distinguished by its superior tolerance to abiotic stresses such as drought and cold. But there have been few studies to investigate the physiological mechanism underlying salt tolerance in M. falcata. In the present study, we compared the response of non-nodulated M. falcata with legume model plant Medicago truncatula Garetn at physiological and molecular level by submitting them to a salt stock. M. falcata exhibited higher survival rate and less chlorosis than M. truncatula seedlings upon exposure to salt stress, suggesting that M. falcata is more tolerant to salt stress than M. truncatula. The ability to maintain a high Kt and low Na+ contents by plants is an important trait for tolerance to salt stress. M falcata accumulated less amount of Na+ in their shoots than M. truncatula when exposed to NaCl, leading to a higher K+/(K+ + Na+) ratio in M. falcata than in M. truncatula under saline conditions. There was a similar difference in Na+ concentration and K+/(K+ + Na+) ratio in roots and xylem sap between the two species under saline conditions. Results from grafting experiments revealed that seedlings grafted with M. falcata either as scions or rootstocks can significantly reduce Na+ accumulation and increase K+ + Na+) ratio in both shoots and roots under saline conditions. Expression levels of SOS1 that encodes a Na+-H+ antiporter responsible for Na+ extrusion from cells in M. falcata were much higher than in M. truncatula under both control and saline conditions. Abundance of SOS1 transcripts in seedlings grafted with M. falcata as either rootstocks or scions was significantly higher than in seedlings self-grafted with M. truncatula. These results strongly suggested that SOS1-dependent Na+ extrusion is an important mechanism to maintain a relatively low Na+ concentration and high K+/(K+ + Na+) ratio in non-nodulated M. falcata under saline conditions, thus conferring tolerance to salt stress. (C) 2014 Elsevier B.V. All rights reserved.
关键词	Leguminous plants Response to salt shock SOS1 Grafting
学科领域	Plant Sciences ; Environmental Sciences
DOI	10.1016/j.envexpbot.2014.09.005
收录类别	SCI
语种	英语
WOS关键词	PHOSPHORUS DEFICIENCY ; NA+ TRANSPORT ; STRESS ; DISTANCE ; PROLINE ; GENE ; HOMEOSTASIS ; MECHANISMS ; DROUGHT ; BETAINE
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
WOS记录号	WOS:000346548600006
出版者	PERGAMON-ELSEVIER SCIENCE LTD
文献子类	Article
出版地	OXFORD
EISSN	1873-7307
资助机构	National Natural Science Foundation of China [31272234] ; National Basic Research Program of China [2015CB150800]
作者邮箱	whzhang@ibcas.ac.cn
引用统计	被引频次：32[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/25815
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Beijing Inst Life Sci, Res Network Global Change Biol, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Liu, Min,Wang, Tian-Zuo,Zhang, Wen-Hao. Sodium extrusion associated with enhanced expression of SOS1 underlies different salt tolerance between Medicago falcata and Medicago truncatula seedlings[J]. ENVIRONMENTAL AND EXPERIMENTAL BOTANY,2015,110:46-55.
APA	Liu, Min,Wang, Tian-Zuo,&Zhang, Wen-Hao.(2015).Sodium extrusion associated with enhanced expression of SOS1 underlies different salt tolerance between Medicago falcata and Medicago truncatula seedlings.ENVIRONMENTAL AND EXPERIMENTAL BOTANY,110,46-55.
MLA	Liu, Min,et al."Sodium extrusion associated with enhanced expression of SOS1 underlies different salt tolerance between Medicago falcata and Medicago truncatula seedlings".ENVIRONMENTAL AND EXPERIMENTAL BOTANY 110(2015):46-55.

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