摘要
为探讨草本植物对镉镍胁迫的适应性特征及生理机制,以禾本科多年生草本植物杂交狼尾草(Pennisetum americanum×Pennisetum purpureum)、高羊茅(Festuca arundinacea)为研究材料,设计不同的镉、镍污染水平,研究两种植物幼苗生物量和抗性生理特性的变化规律。结果表明:镉胁迫下,浓度为0~50 mg·L^(-1)对杂交狼尾草地上部鲜重有促进效果,当镉浓度为200 mg·L^(-1)时两种草本植物的幼苗生物量均降至最低水平,且超氧化物歧化酶、过氧化物酶和过氧化氢酶活性均随镉浓度升高呈先升后降的趋势。镍胁迫下,两种植物丙二醛含量与超氧阴离子含量在镍浓度为300 mg·L^(-1)时达到最大,杂交狼尾草的可溶性蛋白在镍浓度为300 mg·L^(-1)时达到最大,高羊茅的可溶性蛋白在镍浓度为200 mg·L^(-1)时达到最大。对两种植物的形态生理指标进行主成分分析和隶属函数评价,结果表明,镉胁迫下杂交狼尾草抗逆性最大,镍胁迫下高羊茅的抗逆性最大。本研究结果有望应用于植物修复镉镍污染土壤。
We investigated the adaptive characteristics and physiological mechanisms of Pennisetum americanum × P.purpureum and Festuca arundinacea under cadmium(Cd) and nickel(Ni) stresses.Seedling biomass and resistance physiological characteristics of those two species were measured under different concentrations of Cd and Ni.The results showed that the concentrations ranging from 0 to 50 mg·L^(-1) of Cd promoted the fresh weight of P.americanum × P.purpureum shoot.At a concentration of 200 mg·L^(-1),the seedling biomass of both species decreased significantly.The activities of superoxide dismutase(SOD),peroxidase(POD),and catalase(CAT) initially increased and then declined with the increases of Cd concentration.Under Ni stress,the malondialdehyde(MDA) content and superoxide anion content of both species peaked at the concentration of 300 mg·L^(-1).The soluble protein content of P.americanum × P.purpureum reached its maximum at the Ni concentration of 300 mg·L^(-1),while Festuca arundinacea exhibited the highest soluble protein content at the concentration of 200 mg·L^(-1).Principal component analysis and membership function evaluation were employed to analyze the morphological and physiological indices of those two species.The results indicated that P.americanum × P.purpureum exhibited the highest stress resistance under Cd stress,while Festuca arundinacea performed best under Ni stress.Overall,our results provide valuable insights into the potential use of those two species in the phytoremediation of Cd and Ni polluted soils.
作者
关正
张粉果
梁芙蓉
张三庆
关正萍
王永吉
GUAN Zheng;ZHANG Fenguo;LIANG Furong;ZHANG Sanqing;GUAN Zhengping;WANG Yongji(College of Life Sciences,Shanxi Normal University,Taiyuan 030031,China;State Key Laboratory of Vegetation and Environmental Change,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China;College of Food Sciences,Shanxi Normal University,Taiyuan 030031,China)
出处
《生态学杂志》
北大核心
2025年第5期1569-1580,共12页
Chinese Journal of Ecology
基金
国家自然科学基金项目(41801027,31700434)
山西省基础研究计划项目(202203021211250,202203021211252)
山西省留学回国人员科技活动择优资助项目(20230025,20230027)
山西省回国留学人员科研资助项目(2024-089,2023-110)
山西师范大学研究生科技创新项目(2021XSY034)资助。
关键词
重金属胁迫
草本植物
生理特性
生长抑制
heavy metal stress
herbaceous plant
physiological characteristics
growth inhibition
