Physiological Mechanism of Exogenous Selenium in Alleviating Mercury Stress on Pakchoi(Brassica campestris L.)  

作　　者：Chengxu Qian Qiangwen Chen Leiyu Jiang Xiaoyan Yang Shen Rao Weiwei Zhang Feng Xu 

机构地区：[1]College of Horticulture and Gardening,Yangtze University,Jingzhou,434025,China [2]Enshi Se-Run Material Engineering Technology Co.,Ltd.,Enshi,445000,China [3]Henry Fok School of Biology and Agricultural,Shaoguan University,Shaoguan,512005,China [4]National R&D for Se-Rich Agricultural Products Processing Technology,Wuhan Polytechnic University,Wuhan,430023,China

出　　处：《Phyton-International Journal of Experimental Botany》2024年第5期951-962,共12页国际实验植物学杂志（英文）

基　　金：the Key Program of Hubei Province,Grant Number 2023BBA043.

摘　　要：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)stress.The results showed that treatment with HgCl_(2)(40 mg L^(−1))led to reduced biomass,dwarfing,root shortening,and root tip necrosis in pakchoi.Compared 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 pakchoi.Low 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 changes.The 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 pakchoi.The biomass,plant height,root length,chlorophyll content,soluble protein,other physiological indicators,and proline showed significant increases compared with the HgCl_(2)treatment.Additionally,the MDA content and mercury accumulation in pakchoi decreased.Our results revealed the antagonistic effects of selenium and mercury in pakchoi.Thus,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 

分 类 号：Q94[生物学—植物学]