人参菜对镉胁迫的生理响应  

Physiological Response of Talinum Paniculatum to Cadmium Stress

作　　者：仰路希 谢永东[1] 贺忠群[1] YANG Lu-xi;XIE Yong-dong;HE Zhong-qun(College of Hortic ulture,Sichuan A gricultural University,Chengdu 611130,China)

机构地区：[1]四川农业大学园艺学院,四川成都611130

出　　处：《土壤通报》2020年第2期481-486,共6页Chinese Journal of Soil Science

基　　金：雅安雨城区项目(063H0201)资助。

摘　　要：采用盆栽试验,研究不同浓度镉胁迫对人参菜的生长、光合色素含量、叶绿素荧光参数、抗氧化物酶活性、根系活力、渗透调节物质、镉积累的影响。结果表明:(1)人参菜对镉有一定的积累能力,且人参菜中镉的分布是根>叶>茎。(2)低镉浓度(0~10 mg kg^-1)对人参菜株高、根长、干重、光合色素含量、抗氧化物酶含量有促进作用,中、高镉浓度(10~20 mg kg^-1)会抑制其生长。(3)随着镉浓度的增加,人参菜叶片的Fo、ΦPSⅡ呈降低趋势,Fm、Fv/Fm、q P呈先升高后降低的变化趋势。(4)随着镉浓度升高,人参菜叶片的相对电导率呈先升高后降低的变化趋势,可溶性糖、可溶性蛋白含量增加。综上所述,镉胁迫下人参菜的生长表现出"低促高抑"的现象,这为揭示镉胁迫下人参菜的生理响应奠定了基础。A pot experiment was conducted to study the effects of different concentrations of cadmium stress on the growth,photosynthetic pigment content,chlorophyll fluorescence parameters,antioxidant enzyme activities,root activity,osmotic adjustment substances and cadmium accumulation of Talinum Paniculatum.The results showed that:(1)Talinum Paniculatum had a certain ability to accumulate cadmium,and the distribution of cadmium in Talinum Paniculatum was root>leaf>stem.(2)Low cadmium concentration(0-10 mg kg^-1)can promote the plant height,root length,dry weight,photosynthetic pigment content and antioxidant enzyme content of Talinum Paniculatum,medium and high cadmium concentration(10-20 mg kg^-1)inhibited its growth.(3)With the increase of Cd concentration,the Fo andΦPSIIof Talinum Paniculatum leaves decreased,and Fm,Fv/Fm and q P increased first and then decreased.(4)The relative conductivity of Talinum Paniculatum leaves increased first and then decreased.Soluble sugar and soluble protein content increased with the increase of heavy metal concentration.In summary,the growth of Talinum Paniculatum under cadmium stress showed a phenomenon of"low promotion and high inhibition",which laid a foundation for revealing the physiological response of Talinum Paniculatum under cadmium stress.

关 键 词：人参菜 镉胁迫 生长 光合色素 渗透调节物质 

分 类 号：X503.231[环境科学与工程—环境工程]