Physiological Responses of Paspalum vaginatum Sw. to Cd Stress and Its Cd Accumulation Characteristics  

海雀稗对镉胁迫的生理响应及积累特性（英文）

作　　者：段瑞军[1] 刘姣[1] 吴朝波[1,2] 王蕾[1,2] 郭建春[1] 李瑞梅[1] 符少萍[1] 

机构地区：[1]中国热带农业科学院热带生物技术研究所,海南海口571101 [2]海南大学,海南海口570228

出　　处：《Agricultural Science & Technology》2016年第8期1879-1884,1916,共7页农业科学与技术（英文版）

基　　金：中国科协青年人才托举工程项目;中央级公益性科研院所基本科研业务费专项基金(IT-BB2015ZD03,1630052015038)~~

摘　　要：The physiological responses of Paspalum vaginatum Sw. to Cd stress and its Cd accumulation characteristics were studied by investigating the effects of different concentrations of Cd on the growth, root vigor, leaf membrane permeability, membrane lipid peroxidation, protective enzyme activity and Cd accumulation of P. vaginatum. When the Cd concentration was over 50.00 mg/kg, with the increased Cd concentration, the CAT activity declined significantly, the synergistic effect between SOD and CAT was weakened, the MDA content increased greatly, and the root vigor decreased, leading to inhibited growth of P. vaginatum. When the Cd concentration was in the range of 0-50 mg/kg, the root vigor of P. vaginatum did not decline obviously, the activity of protective enzymes （SOD and CAT） was enhanced, and the MDA accumulation and cell membrane permeability did not increase significantly, thus the damage of Cd to P. vaginatum was lighter. Roots of P. vaginatum showed strong enrichment capacity for Cd. When the Cd concentration was up to 200.00 mg/kg, the Cd contents in shoot and root of P. vaginatum reached 39.15 and 1 097.38 mg/kg, respectively. It suggests that in the concentration range of 0-50.00 mg/kg, P. vaginatum can make effective responses to Cd stress and grow normally, and it can be planted as a candidate material to remediate Cd-contaminated soil.为研究海雀稗对镉胁迫的生理响应及其镉积累特性，本研究采用土培法对海雀稗进行镉胁迫，探究了不同镉浓度对海雀稗生长、根系活力、叶片膜透性、膜脂过氧化、保护酶活性以及镉积累的影响。结果表明，镉浓度〉50．00mg／kg时,随镉浓度增加，CAT活性显著下降，SOD与CAT的协同作用降低，MDA大量积累和根活力下降，植物生长受到抑制;镉浓度为0～50．00mg／kg时,海雀稗根系活力未显著下降，保护酶活性（SOD、CAT）增强,MDA积累量和细胞膜透性未明显增加，植物受镉毒害较小。海雀稗根系对镉具有极强的富集能力,镉浓度为200．00mg／kg时，其地上部分和地下部分镉含量分别为39．15mg／kg和1097．38mg／kg。说明海雀稗对镉胁迫（0～50．00mg／kg）能做出有效反应，并正常生长，可以作为修复土壤镉污染的备选种植植物。

关 键 词：Paspalum vaginatum Sw. Cd stress MDA SOD CAT Root vigor 

分 类 号：Q945.78[生物学—植物学]