Efficient acquisition of iron confers greater tolerance to saline-alkaline stress in rice (Oryza sativa L.)

doi:10.1093/jxb/erw407

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	Efficient acquisition of iron confers greater tolerance to saline-alkaline stress in rice (Oryza sativa L.)
	Li, Qian ; Yang, An ; Zhang, Wen-Hao
刊名	JOURNAL OF EXPERIMENTAL BOTANY
	2016
卷号	67 期号:22
关键词	Dongdao-4 iron acquisition iron deficiency Jigeng-88 Oryza sativa rice saline-alkaline stress
ISSN号	0022-0957
DOI	10.1093/jxb/erw407
文献子类	Article
英文摘要	To elucidate the mechanisms underlying tolerance to saline-alkaline stress in two rice genotypes, Dongdao-4 and Jigeng-88, we exposed them to medium supplemented with 10 mM Na2CO3 and 40 mM NaCl (pH 8.5). Dongdao-4 plants displayed higher biomass, chlorophyll content, and photosynthetic rates, and a larger root system than Jigeng-88 under saline-alkaline conditions. Dongdao-4 had a higher shoot Na+/K+ ratio than Jigeng-88 under both control and saline-alkaline conditions. Dongdao-4 exhibited stronger rhizospheric acidification than Jigeng-88 under saline-alkaline conditions, resulting from greater up-regulation of H+-ATPases at the transcriptional level. Moreover, Fe concentrations in shoots and roots of Dongdao-4 were higher than those in Jigeng-88, and a higher rate of phytosiderophore exudation was detected in Dongdao-4 versus Jigeng-88 under saline-alkaline conditions. The Fe-deficiency-responsive genes OsIRO2, OsIRT1, OsNAS1, OsNAS2, OsYSL2, and OsYSL15 were more strongly up-regulated in Dongdao-4 than Jigeng-88 plants in saline-alkaline medium, implying greater tolerance of Dongdao-4 plants to Fe deficiency. To test this hypothesis, we compared the effects of Fe deficiency on the two genotypes, and found that Dongdao-4 was more tolerant to Fe deficiency. Exposure to Fe-deficient medium led to greater rhizospheric acidification and phytosiderophore exudation in Dongdao-4 than Jigeng-88 plants. Expression levels of OsIRO2, OsIRT1, OsNAS1, OsNAS2, OsYSL2, and OsYSL15 were higher in Dongdao-4 than Jigeng-88 plants under Fe-deficient conditions. These results demonstrate that a highly efficient Fe acquisition system together with a large root system may underpin the greater tolerance of Dongdao-4 plants to saline-alkaline stress.
学科主题	Plant Sciences
电子版国际标准刊号	1460-2431
出版地	OXFORD
WOS关键词	FERRIC-CHELATE REDUCTASE ; NICOTIANAMINE SYNTHASE GENES ; VACUOLAR NA+/H+ ANTIPORTER ; SALT TOLERANCE ; ION BALANCE ; FE-DEFICIENCY ; PHYSIOLOGICAL-RESPONSES ; PUCCINELLIA-TENUIFLORA ; GROWTH ; BICARBONATE
WOS研究方向	Science Citation Index Expanded (SCI-EXPANDED)
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000397126300015
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31301832] ; Chinese Academy of SciencesChinese Academy of Sciences [XDA08010401]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/24480]
专题	植被与环境变化国家重点实验室
作者单位	1.[Li, Qian 2.Chinese Acad Sci, Beijing Inst Life Sci, Res Network Global Change Biol, Beijing 100093, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 5.Yang, An
推荐引用方式 GB/T 7714	Li, Qian,Yang, An,Zhang, Wen-Hao. Efficient acquisition of iron confers greater tolerance to saline-alkaline stress in rice (Oryza sativa L.)[J]. JOURNAL OF EXPERIMENTAL BOTANY,2016,67(22).
APA	Li, Qian,Yang, An,&Zhang, Wen-Hao.(2016).Efficient acquisition of iron confers greater tolerance to saline-alkaline stress in rice (Oryza sativa L.).JOURNAL OF EXPERIMENTAL BOTANY,67(22).
MLA	Li, Qian,et al."Efficient acquisition of iron confers greater tolerance to saline-alkaline stress in rice (Oryza sativa L.)".JOURNAL OF EXPERIMENTAL BOTANY 67.22(2016).