盐镉互作下盐地碱蓬和碱蓬生长及镉吸收的比较研究  

Comparative study on the growth and Cd uptake of Suaeda salsa and Suaeda glauca under the stress of salt and Cd and their interaction

作　　者：吴玉洁 封晓辉[1] 张睿[1,2] 李静 刘小京[1,2] WU Yujie;FENG Xiaohui;ZHANG Rui;LI Jing;LIU Xiaojing(Hebei Key Laboratory of Soil Ecology/Engineering Laboratory for Efficient Utilization of Saline Resources,Chinese Academy of Sciences/Center for Agricultural Resources Research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Shijiazhuang 050022,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]河北省土壤生态学重点实验室/中国科学院盐碱地资源高效利用工程实验室/中国科学院遗传与发育生物学研究所农业资源研究中心,石家庄050022 [2]中国科学院大学,北京100049

出　　处：《中国生态农业学报（中英文）》2022年第7期1186-1193,共8页Chinese Journal of Eco-Agriculture

基　　金：中国科学院工程实验室建设项目(KFJ-PTXM-017);河北省重点研发计划项目(20327002D)资助。

摘　　要：利用盐生植物修复盐碱地重金属污染是一种经济有效且安全性高的生物修复方法,但盐和重金属互作对不同盐生植物生长和重金属元素吸收的研究不足。本研究采用水培试验,比较盐和镉互作对典型聚盐盐生植物盐地碱蓬(Suaeda salsa)和碱蓬(Suaeda glauca)生长及对重金属Cd吸收的影响,分析盐对镉吸收的调节作用。试验设置两个盐水平(0 g∙L^(−1)、10 g∙L^(−1) NaCl)和两个Cd水平(0 mg∙L^(−1)、5 mg∙L^(−1) Cd),共4个处理。研究结果表明,Cd处理显著抑制两种植物的生长,降低了叶片肉质化程度和根冠比,且对盐地碱蓬的抑制作用大于碱蓬,对根部的抑制更明显。10 g∙L^(−1) NaCl盐处理均促进两种植物地上部的生长,且对盐地碱蓬地上部生长的促进作用显著大于碱蓬;但显著抑制碱蓬根系的生长。Cd处理下施加NaCl显著缓解Cd对两种植物的抑制作用,且对盐地碱蓬的缓解作用大于碱蓬,对Cd抑制盐地碱蓬根系生长的缓解作用为极显著。盐地碱蓬和碱蓬地上部Cd含量差异不显著,盐处理显著降低两种植物地上部Cd含量。盐处理显著促进两种植物地上部对Na^(+)的吸收,盐地碱蓬地上部Na^(+)含量和Na^(+)/Cd高于碱蓬,但K^(+)含量、K^(+)/Na^(+)和K^(+)/Cd显著低于碱蓬,且Cd处理进一步促进了两种植物地上部对Na^(+)的吸收;盐处理降低K^(+)的吸收和K^(+)/Na^(+),碱蓬地上部K^(+)的吸收和K^(+)/Na^(+)均大于盐地碱蓬。盐、Cd处理下两种植物间地上部脯氨酸含量差异不明显,但盐、Cd及其互作有增加地上部脯氨酸含量的趋势。在无胁迫和单一Cd处理下,盐地碱蓬地上部可溶性糖含量显著高于碱蓬;盐处理显著降低了盐地碱蓬地上部可溶性糖含量,Cd处理显著增加了碱蓬地上部可溶性糖的含量。上述结果表明,盐地碱蓬和碱蓬的生长对盐、Cd及其互作的响应不同,盐分可以缓解Cd对其生长的抑制作用,特别是Cd对�Remediation of heavy metal-contaminated saline-alkali soil by halophytes is a cost-effective and environmentally friendly method,but there is less information on the comparative study of different halophytic species under salt and heavy metal stresses.In this study,hydroponic experiments were conducted to compare the effects of salt and Cd interactions on the growth and Cd uptake between two typical leaf succulent halophytes,Suaeda salsa and Suaeda glauca,and to explore the regulatory effect of salt on Cd absorption.There were four treatments with two salt levels(0 and 10 g·L^(−1) NaCl)and two Cd levels(0 and 5 mg·L^(−1) Cd).The results showed that Cd treatment significantly inhibited the growth of the two plants and reduced leaf succulence and root-to-shoot ratio.Additionally,the inhibitory effect was greater on S.salsa than on S.glauca,especially with respect to root growth.Salt treatment promoted the shoot growth of both plants,and the promotion effect on shoot growth was significantly greater in S.salsa than in S.glauca.However,the root growth of S.glauca was significantly inhibited.The salt treatment under Cd stress significantly alleviated the inhibitory effect of Cd on the growth of both plants,and the alleviation effect on S.salsa was greater than that of S.glauca,especially on the root growth of S.salsa.There was no significant difference in shoot Cd content between S.salsa and S.glauca under Cd stress,but the Cd content in the shoots of the two plants was significantly reduced by salt treatment.The Na^(+)content and Na^(+)/Cd ratio in the shoots of S.salsa were higher than those in S.glauca,but the K^(+)content,K^(+)/Na^(+)ratio,and K^(+)/Cd ratio were significantly lower than those in S.glauca.Salt treatment significantly promoted Na^(+)absorption in the shoots of both plants,and Cd treatment further promoted Na^(+)absorption in the shoots.Salt treatment reduced shoot K^(+)content and K^(+)/Na^(+)ratio in both plants;these values were higher in S.glauca than in S.salsa.There was a tendency for sh

关 键 词：盐地碱蓬 碱蓬 CD污染 盐胁迫 生物修复 

分 类 号：X53[环境科学与工程—环境工程]