农业环境科学学报2012，Vol.31Issue(5)：885-890,6.
两种基因型龙葵对镉胁迫的生理响应及镉吸收差异
Difference of Cadmium Absorption and Physiological Responses to Cadmium Stress in Two Different Solanum Nigrum
摘要
Abstract
The influence of different cadmium concentralions(0,5,25, 50, 100 μg·g-1) on the biomass, Cd absorption, Cd transfer frequency, Cd bioaccumulation coefficient, activity of antioxidant enzymes( SOD, POD) and other physiological characteristics of two Solanum Nigrum varieties were studied to compare the difference of cadmium enrichment by a pot experiment. The results showed that two Solanum Nigrum varieties had obvious difference in Cd absorption. Compared with controls, the biomass of two varieties decreased significantly (p<0.05) when Cd concentration & 25 μg · g-1, and within the two viarieties, the biomass reduction of S. nigrum L. var. flavovirens S. Z exceeded lhat of S. photeinocarpum Nakamura. With the increasing Cd concentration, Cd absorption in root, stem and leaf of two varieties increased significantly (P<0.05), but Cd absorption in root was higher than lhat in stem and leaf, and Cd concentration by S. photeinocarpum Nakamura was higher than that by S. nigrum L var. flavov'vrens S. Z. Only under 5 μg·g-1 Cd stress were Cd transfer frequency and Cd bioaccmulation coefficient of two varieties higher than 1, besides, Cd transfer frequency and Cd bioaccmulation coefficient in 5. photeinocarpum Nakamura were greater than in S. nigrum L. var. flavovirens S. Z.. With the increasing of Cd concentration , soluble protein, free Pro and activity of antioxidant en-zymes(S0D, POD) were significantly increased under lower Cd concentration and decreased under higher Cd concentration. Compared with controls, these physiological characteristics of S. photeinocarpum Nakamura displayed obvious rise and not obvious decline than that of S. ni-gnan L var. flavovirens S. Z. In conclusion, two varieties were not the Cd hyperaecumulator and S. photeinocarpum Nakamura had a higher tolerance to cadmium stresses.关键词
镉胁迫/龙葵/生物量/可溶性蛋白/游离脯氨酸/SOD/POD/Cd吸收量Key words
cadmium stresses/ Solanum Nigrum/ biomass/ soluble protein/ free Pro/ SOD/ POD/ Cd absorption分类
资源环境引用本文复制引用
曾秀存,许耀照,张芬琴..两种基因型龙葵对镉胁迫的生理响应及镉吸收差异[J].农业环境科学学报,2012,31(5):885-890,6.基金项目
国家自然科学基金资助项目(31160053) （31160053）
甘肃省高等学校研究生导师科研资助项目(1109-02) （1109-02）
