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Version 3.24
Publication Type J
Authors Kang, JJ; Zhao, WZ; Zhu, X
Author Full Name Kang, Jianjun; Zhao, Wenzhi; Zhu, Xi
Title Silicon improves photosynthesis and strengthens enzyme activities in the C-3 succulent xerophyte Zygophyllum xanthoxylum under drought stress
Language English
Document Type Article
Author Keywords Zygophyllum xanthoxylum; Succulent xerophyte; Silicon; Water deficit; Growth; Drought resistance
Abstract 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.
Author Address [Kang, Jianjun; Zhao, Wenzhi; Zhu, Xi] 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
Reprint Address Zhao, WZ (reprint author), 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.
E-mail Address zhaowzh@lzb.ac.cn
Funding Agency and Grant Number Chinese National Natural Science Foundation [31360086]; major state basic research development program of china (973 program) [2013CB429903]
Funding Text We are very grateful to the researcher Zihui-Yang of Gansu Desert Control Research Institute, Gansu, China, for his positive comments and advices which significantly modified the quality of our manuscript. The study was subsidized by the Chinese National Natural Science Foundation (Grant No. 31360086) and the major state basic research development program of china (973 program, No. 2013CB429903).
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Cited Reference Count 51
Times Cited 2
Total Times Cited Count (WoS, BCI, and CSCD) 2
Publisher City JENA
Publisher Address OFFICE JENA, P O BOX 100537, 07705 JENA, GERMANY
ISSN 0176-1617
29-Character Source Abbreviation J PLANT PHYSIOL
ISO Source Abbreviation J. Plant Physiol.
Publication Date JUL
Year Published 2016
Volume 199
Beginning Page 76
Ending Page 86
Digital Object Identifier (DOI) 10.1016/j.jplph.2016.05.009
Page Count 11
Web of Science Category Plant Sciences
Subject Category Plant Sciences
Document Delivery Number DO9DR
Unique Article Identifier WOS:000378085000008
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