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Effect of La^(3+)on Activities of Antioxidant Enzymes in Wheat Seedlings under mercury stress

Journal of Rare Earths 2002年第3期20卷 218-222页

作者：庞欣王东红彭安张福锁邢晓燕李春俭 Lab. of Environ. Aquatic Chem. Res. Center. for Eco-Environ. Sci. Chinese Acad. of Sci. Beijing 100085 China

The effects of La(NO 3) 3 on the growth,activities of SOD,CAT and MDA content in shoots and roots of wheat seedlings under mercury stress were evaluated by the nutrient solution culture experiment. The results suggest that there is positive effect of La(NO 3) 3 on enhancing the activities of SOD,CAT,decrease of MDA content in shoots and roots of wheat seedlings during 0～5 d. But La(NO 3) 3 evens and cooperates with mercury when plants are too long under mercury stress. mercury inhibits the growth of wheat seedlings more grievously.

关键词： rare earths lanthanum mercury stress catalase superoxide dismutase malondialdehyde Trticum aestivum

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Physiological Mechanism of Exogenous Selenium in Alleviating mercury stress on Pakchoi(Brassica campestris L.)

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Phyton-International Journal of Experimental Botany 2024年第5期93卷 951-962页

作者： Chengxu Qian Qiangwen Chen Leiyu Jiang Xiaoyan Yang Shen Rao Weiwei Zhang Feng Xu College of Horticulture and Gardening Yangtze UniversityJingzhou434025China Enshi Se-Run Material Engineering Technology Co. Ltd.Enshi445000China Henry Fok School of Biology and Agricultural Shaoguan UniversityShaoguan512005China National R&D for Se-Rich Agricultural Products Processing Technology Wuhan Polytechnic UniversityWuhan430023China

The objective of this study was to explain the physiological mechanisms through which Na_(2)SeO_(3) mitigates the growth and developmental inhibition of pakchoi under HgCl_(2)*** results showed that treatment with HgCl_(2)(40 mg L^(−1))led to reduced biomass,dwarfing,root shortening,and root tip necrosis in *** to control(CK),the activities of superoxide dismutase(SOD)and peroxidase(POD)in Hg treatment increased,and the content of malondialdehyde(MDA)also dramatically increased,which negatively impacted the growth of *** concentrations of Na_(2)SeO_(3)(0.2 mg L^(−1))significantly increased the content of soluble sugars compared with control,while chlorophyll,soluble proteins,free amino acids,and vitamin C had no significant *** results of the mixed treatments with HgCl_(2)and Na_(2)SeO_(3) suggested that selenium may be able to reduce the toxicity of mercury in *** biomass,plant height,root length,chlorophyll content,soluble protein,other physiological indicators,and proline showed significant increases compared with the HgCl_(2)***,the MDA content and mercury accumulation in pakchoi *** results revealed the antagonistic effects of selenium and mercury in ***,a theoretical basis for studying pakchoi’s mercuryexcreted and selenium-rich cultivation technology was provided.

关键词： Selenium mercury stress pakchoi physiological properties antioxidant enzymes

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Comparative proteomic study and functional analysis of translationally controlled tumor protein in rice roots under Hg^(2+) stress

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Journal of Environmental Sciences 2012年第12期24卷 2149-2158页

作者： Feijuan Wang Yongshen Shang Ling Yang Cheng Zhu College of Life Sciences Zhejiang UniversityHangzhou 310058China College of Life Sciences China Jiliang UniversityHangzhou 310018China College of Chemistry and Life Sciences Zhejiang Normal UniversityJinhua 321004China

So far, very little is known about mercury stress-induced intercellular metabolic changes in rice roots at the proteome level. To investigate the response of rice roots to mercury stress, changes in protein expression in rice roots were analyzed using a comparative proteomics approach. Six-leaf stage rice seedlings were treated with 50 μmol/L HgC12 for 3 hr; 29 protein spots showed a significant changes in abundance under stress when compared with the Hg2＋-tolerant rice mutant and wild type （Zhonghua 11）. Furthermore, all these protein spots were identified by mass spectrometry to match 27 diverse protein species. The identified proteins were involved in several processes, including stress response, redox homeostasis, signal transduction, regulation and metabolism; some were found to be cellular structure proteins and a few were unknown. Among the up-regulated proteins, OsTCTP （translationally controlled tumor protein） was chosen to perform hetereologous expression in yeast which was presumed to participate in the Hg2~ tolerance of rice, providing evidence for its role in alleviating Hg2~ damage. Among the many tests, we found that OsTCTP-overexpressed yeast strains were more resistant to Hg2＋ than wild-type yeast. Thus, we propose that OsTCTP contributes to Hg2＋ resistance. Here we present, for the first time, the functional characterization of OsTCTP in connection with Hg2＋ stress in plants.

关键词： 2-DE mercury stress rice roots OsTCTP heteroexpression

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