中国中药杂志

2015, v.40(15) 2903-2908

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三七对镉胁迫的生理响应及富集特性研究
Physiological response and bioaccumulation of Panax notoginseng to cadmium under hydroponic

李子唯;杨野;崔秀明;廖沛然;葛进;王承潇;杨晓艳;刘大会;
LI Zi-wei;YANG Ye;CUI Xiu-ming;LIAO Pei-ran;GE Jin;WANG Cheng-xiao;YANG Xiao-yan;LIU Da-hui;Kunming Key Laboratory of Sustainable Development and Utilization of Famous-region Drug,Faculty of Life Science and Technology,Kunming University of Science and Technology;Institute of Medicinal Plants,Yunnan Academy of Agriculture Science;

摘要(Abstract):

以二年生三七为试验材料,水培条件下研究了镉胁迫(0,2.5,5,10μmol·L-1)对三七抗氧化酶系统和光合参数的影响及三七对镉的吸收分配规律。结果表明:2.5μmol·L-1镉处理可诱导SOD,POD,APX等酶活性的升高,10μmol·L-1镉处理则对SOD,POD,APX,CAT均产生抑制作用;镉处理对三七各部位CAT活性均具有抑制作用;三七净光合速率,蒸腾速率,气孔导度均随镉处理浓度的升高而降低,胞间CO2浓度则呈先下降后上升的趋势;三七各器官镉含量表现为须根>剪口>主根>叶片>茎;叶,茎,剪口,须根,主根镉富集系数均随镉处理浓度的升高而降低;各器官中镉含量与迁移系数均随镉处理浓度的升高而上升。综上所述,镉胁迫可对三七抗氧化酶系统和光合系统产生影响,三七对镉具有富集作用,应合理选择三七种植基地以减少对镉的吸收,合理选取三七入药部位,以降低镉摄入风险。
The physiological response and bioaccumulation of 2-year-old Panax notoginseng to cadmium stress was investigated under a hydroponic experiment with different cadmium concentrations( 0,2. 5,5,10 μmol·L-1). Result showed that low concentration( 2. 5 μmol·L-1) of cadmium could stimulate the activities of SOD,POD,APX in P. notoginseng,while high concentration( 10μmol·L-1) treatment made activities of antioxidant enzyme descended obviously. But,no matter how high the concentration of cadmium was,the activities of CAT were inhibited. The Pn,Tr,Gsin P. notoginseng decreased gradually with the increase of cadmium concentration,however Ci showed a trend from rise to decline. The enrichment coefficients of different parts in P. notoginseng ranked in the order of hair root > root > rhizome > leaf > stem,and all enrichment coefficients decreased with the increase of concentration of cadmium treatments; while the cadmium content in different parts of P. notoginseng and the transport coefficients rose. To sum up,cadmium could affect antioxidant enzyme system and photosynthetic system of P. notoginseng; P. notoginseng had the ability of cadmium enrichment,so we should plant it in suitable place reduce for reducing the absorption of cadmium; and choose medicinal parts properly to lessen cadmium intake.

关键词(KeyWords): 三七;镉;抗氧化酶;光合参数;富集系数;迁移系数
Panax notoginseng;cadmium stress;physiological response;photosynthetic parameters;enrichment coefficients;transport coefficients

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金项目(81360617,81460580);; 昆明理工大学分析测试基金项目(20140743)

作者(Authors): 李子唯;杨野;崔秀明;廖沛然;葛进;王承潇;杨晓艳;刘大会;
LI Zi-wei;YANG Ye;CUI Xiu-ming;LIAO Pei-ran;GE Jin;WANG Cheng-xiao;YANG Xiao-yan;LIU Da-hui;Kunming Key Laboratory of Sustainable Development and Utilization of Famous-region Drug,Faculty of Life Science and Technology,Kunming University of Science and Technology;Institute of Medicinal Plants,Yunnan Academy of Agriculture Science;

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