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	Silicon improves photosynthesis and strengthens enzyme activities in the C-3 succulent xerophyte Zygophyllum xanthoxylum under drought stress
	Kang, Jianjun; Zhao, Wenzhi; Zhu, Xi
刊名	JOURNAL OF PLANT PHYSIOLOGY
	2016-07-01
卷号	199页码:76-86
关键词	Zygophyllum xanthoxylum Succulent xerophyte Silicon Water deficit Growth Drought resistance
ISSN号	0176-1617
DOI	10.1016/j.jplph.2016.05.009
通讯作者	Zhao, Wenzhi(zhaowzh@lzb.ac.cn)
英文摘要	One main strategic adaptive mechanism adopted by succulent xerophyte species, resistance to drought stress is absorbing and accumulating large amounts of sodium (Na+) from poor and dry soil which was stored in photosynthesizing branches as well as leaves as major osmoregulators, while still accumulating and storing a great deal of silicon (Si) in roots to resist to arid environments. To understand the possible adaptive strategies underlying how Si accumulation stimulates growth and ameliorates the adverse environmental impacts of drought stress on the c succulent xerophyte Zygophyllum xanthoxylum, plants grown for 3 weeks were suffered different K2SiO3 concentrations (1.5-7.5 mM) (3-15 mM KCl as control) treatments in sand culture experiments. Plants were also treated with different osmotic stresses caused by polyethylene glycol (PEG 6000) and drought stress (maintain water content about 30% of field water capacity) (30% of FWC) with or without additional 2.5 mM K2SiO3 (5 mM KCl as control) treatment in sand culture and pot experiments, respectively. We found that 2.5 mM K2SiO3 (5 mM KCl as control) resulted in optimal plant growth and alleviated adverse influences of drought stress on Z. xanthoxylum, by strengthening the activities of superoxide dismutase, peroxidase and catalase, reducing membrane lipid peroxidation and decreasing soluble sugar and free proline concentrations, concomitantly, increasing tissue water content, leaf area and chlorophyll a concentration. The result of ion analysis indicated that the Si absorption of Z. xanthoxylum was markedly induced by drought stress and that the 2.5 mM K2SiO3 (5 mM KCl as control) treatment significantly increased the aboveground and root Si concentration under different osmotic stresses and 30% of field water capacity compared with the drought and drought with 5 mM KCltreatments. Although the K* concentration in root in the drought with 2.5 mM K2SiO3 treatment was no significant changes compared with the drought treatment, K* concentration in aboveground and root in drought with 2.5 mM K2SiO3 treatment were significantly decreased by 42% and 65.2% compared with drought with 5mM KCl treatment under 30% of FWC, indicating that Si replaced the function of K*, thus stimulating the growth and mitigating adverse effects of Z. xanthoxylum under water deficit. These findings showed that the positive roles of Si in the drought tolerance of Z. xanthoxylum might be due to the ability of plant to accumulate a great quantity of Si and utilize it as an osmoregulator to copy with water deficit, which was coupled with an obvious improvement in photosynthetic activity and anti -oxidative enzyme activities. (C) 2016 Elsevier GmbH. All rights reserved.
收录类别	SCI
WOS关键词	HIGHER-PLANTS ; HALOXYLON-AMMODENDRON ; MEDIATED ALLEVIATION ; PROMOTES GROWTH ; PROTECTIVE ROLE ; WHEAT PLANTS ; SALT STRESS ; SODIUM ; L. ; RESISTANCE
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
语种	英语
出版者	ELSEVIER GMBH, URBAN & FISCHER VERLAG
WOS记录号	WOS:000378085000008
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557248
专题	寒区旱区环境与工程研究所
通讯作者	Zhao, Wenzhi
作者单位	Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Inland River Basin Ecohydrol, Linze Inland River Basin Res Stn, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Kang, Jianjun,Zhao, Wenzhi,Zhu, Xi. Silicon improves photosynthesis and strengthens enzyme activities in the C-3 succulent xerophyte Zygophyllum xanthoxylum under drought stress[J]. JOURNAL OF PLANT PHYSIOLOGY,2016,199:76-86.
APA	Kang, Jianjun,Zhao, Wenzhi,&Zhu, Xi.(2016).Silicon improves photosynthesis and strengthens enzyme activities in the C-3 succulent xerophyte Zygophyllum xanthoxylum under drought stress.JOURNAL OF PLANT PHYSIOLOGY,199,76-86.
MLA	Kang, Jianjun,et al."Silicon improves photosynthesis and strengthens enzyme activities in the C-3 succulent xerophyte Zygophyllum xanthoxylum under drought stress".JOURNAL OF PLANT PHYSIOLOGY 199(2016):76-86.

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