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Bioaccumulation,subcellular distribution and chemical forms of cadmium in aster subulatus michx.

南方农业学报 2024年第8期55卷 2386-2395页

作者： LIANG Xue-lian CHEN Wei JIANG Wen-yan LIAO Jie YANG Yu-xia WANG Hai-jun LI Hui-ling LU Wei-fan WANG Tian-shun XIE Hong-zhao Agro-products Quality Safety and Testing Technology Research Institute Guangxi Academy of Agricultural SciencesNanningGuangxi 530007China Institute of Agro-products Processing Science and Technology Guangxi Academy of Agricultural SciencesNanningGuangxi 530007China Guangxi Association for Standardization NanningGuangxi 530009China

【Objective】Through analyzing the bioaccumulation capacity,subcellular distribution and chemical forms of cadmium(Cd)in aster subulatus michx.,this study was to provide reference for revealing the Cd tolerance mechanism of *** michx.【Method】After cultured for 24 d under the action of Hoagland nutrient solution and gradient Cd concentrations(0,30,60 and 90 mg/L),*** *** harvested,and its leaf,stem and root were treated by differential centrifugation,chemical reagent extraction,and digested with graphite digester,respectively,then the Cd content in the root,stem and leaf were determined by atomic absorption spectroscopy.【Result】The experimental results indicated that the bioaccumulation capacity of Cd in *** *** root>stem>leaf,and the maximum Cd concentration in the root,stem and leaf of *** *** 130.74,78.69 and 56.62 mg/kg(fresh matter),*** of Cd stored in the cell wall and the soluble fractions of the root and leaf of *** michx.,with only a smaller portion Cd in organelle *** result of subcellular Cd content showed that 52.27%-58.61%of Cd for root was mainly stored in the soluble fraction,but 42.10%-63.28%of Cd for leaf was mainly stored in the cell wall *** concentration of pectates and protein integrated-Cd was higher in the root and leaf compared to other chemical forms *** and protein integrated-Cd was the main chemical forms Cd in the root and leaf of *** michx.,and their percentages were 68.91%-74.80%and 57.38%-83.80%,*** treatment could significantly increase the proportion of water-soluble organic acid Cd from 13.64%to 22.72%in root and undissolved phosphate Cd from 10.02%to 32.78%in leaf with increasing Cd concentration in the culture medium.【Conclusion】The root,stem and leaf of *** *** strong bioaccumulation capacity to Cd,Cd is primarily stored in the soluble fractions of the root and cell wall fractions of the leaf,and

关键词： aster subulatus michx. cadmium bioaccumulation chemical form subcellular distribution

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