农业环境科学学报Issue(2)：240-247,8.DOI:10.11654/jaes.2015.02.006
土壤镉胁迫对龙葵(Solanum nigrum L.)幼苗生长及生理特性的影响
Effects of Soil Cadmium on Growth and Physiological Characteristics of Solanum nigrum L. Plants
摘要
Abstract
Solanum nigrum L. has been discovered to be a Cd hyperaccumulating species, and is therefore used for phytomining and phytoex—tracting Cd contaminated soils. In this work, the effects of cadmium on nutrients [nitrogen(N), Phosphorus(P)and potassium(K)] absorption and plasma membrane ATP activity in S. nigrum were investigated in a soil culture experiment. Results showed that lower Cd treatments (≤40 mg·kg— 1)enhanced plant growth and biomass accumulation, whereas higher Cd(>40 mg·kg— 1)inhibited plant growth. Leaf chlorophyll a(Chla), chlorophyll b(Chlb)and total chlorophyll(Chl)contents were increased by 10 mg Cd·kg—1, but decreased at higher Cd doses. With increasing Cd rates, the contents of N, P and K in roots, stems, leaves and fruits firstly increased and then decreased, except P in the stem, while the Cd accumulation in root, stem, leaf and fruit kept increasing, with leaf>stem>root>fruit. In addition, the content of malon—dialdehyde(MDA)and the activities of catalase(CAT)and superoxide dismutase(SOD)increased with increasing Cd doses, while peroxi—dase(POD)activity showed a upside down“V”trend. However, shoot(leaf plus stem)and root H+—ATPase activities and root Ca2+—ATPase activity decreased, but the activity of shoot Ca2+—ATPase firstly increased and then decreased as Cd rates increased. Results obtained in this study suggest that S. nigrum plants may tolerate high Cd(≥40 mg·kg—1)through accelerating the accumulation of Cd ions in root, improv—ing antioxidant enzymes(CAT and SOD) activity , decreasing POD and plasma membrane ATP activity , and enhancing N , P , and K absorption.关键词
龙葵/镉/氮/磷/钾/ATP酶活性/质膜过氧化/叶绿素Key words
Solanum nigrum/cadmium/N, P, K/ATPase activity/lipid peroxidation/chlorophyll分类
资源环境引用本文复制引用
刘柿良,杨容孑,马明东,蒋潘,赵燕..土壤镉胁迫对龙葵(Solanum nigrum L.)幼苗生长及生理特性的影响[J].农业环境科学学报,2015,(2):240-247,8.基金项目
四川农业大学创新团队计划项目 （）
