Comparison of Tolerance and Enrichment Characteristic for Six Herbaceous Plant under Different Levels Cd Stress

doi:10.11733/j.issn.1007-0435.2021.06.017

Acta Agrestia Sinica ›› 2021, Vol. 29 ›› Issue (6): 1265-1276.DOI: 10.11733/j.issn.1007-0435.2021.06.017

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Comparison of Tolerance and Enrichment Characteristic for Six Herbaceous Plant under Different Levels Cd Stress

ZHANG Yang-yang¹, LI Xi-ming¹, GAO Peng², SONG Gui-long¹

1. Institute of Turfgrass Science, Beijing Forestry University, Beijing 100083, China;
2. National Engineering Laboratory for Tree Breeding, Beijing Forestry University, Beijing 100083, China

Received:2020-11-19 Revised:2021-01-14 Online:2021-06-15 Published:2021-07-05

不同浓度镉胁迫下6种草本植物的耐性及富集特征的比较

张杨杨¹, 李希铭¹, 高鹏², 宋桂龙¹

1. 北京林业大学草坪研究所, 北京 100083;
2. 北京林业大学林木育种国家工程实验室, 北京 100083

通讯作者: 宋桂龙,E-mail:syihan@163.com
作者简介:张杨杨(1993-)，女，山东聊城人，硕士研究生，主要从事重金属植物修复研究，E-mail：15501090703@163.com
基金资助:
裸露创面植被快速修复喷播基材改良技术研究与集成（2019YFF0303202-01）；中央高校基本科研业务费专项资金（PTYX202150）资助

Abstract

Abstract: In order to screen and evaluate plant species with higher cadmium (Cd) tolerance,in this study,Medicago sativa,Lotus corniculatus,Coronilla varia,Elymus dahuricum,Agropyron trachycaulum,and Buchloe dactyloides,six common herbaceous plant species were selected. We set 0 mg·kg^-1 Cd treatment concentration as control (CK),and potted simulation experiments of different concentrations of cadmium were used to explore the effects of Cd stress on plant enrichment characteristics and root morphological changes,and to evaluate their Cd tolerance threshold. The main findings were as follows:the biomass and root morphology of the six herbaceous plants under different concentrations of Cd showed a phenomenon of "promotion at low Cd concentration and suppression at high Cd concentration". Different species had different tolerance to Cd. The tolerance threshold of Cd was between 50 mg·kg^-1 and 100 mg·kg^-1 for Medicago sativa and Coronilla varia,and the tolerance threshold of Lotus corniculatus,Elymus dahuricum,Agropyron trachycaulum and Buchloe dactyloides to Cd was above 100 mg·kg^-1. Under the stress of 100 mg·kg^-1 Cd,Lotus corniculatus,Elymus dahuricum and Buchloe dactyloides could be used for restoration of heavy metal contaminated soil by means of plant extraction. When Agropyron trachycaulum was treated at 100 mg·kg^-1 Cd,the root enrichment coefficient was still greater than1,and the root biomass and tolerance coefficient had a trend of increasing with the increasd of Cd stress. Agropyron trachycaulum is an ideal herb material with high Cd tolerance and high resistance for repairing heavy metal contaminated soil.

Key words: Cadmium stress, Enrichment Characteristic, Accumulation Characteristic, Tolerance threshold

摘要： 为了筛选并评价耐镉（Cadmium，Cd）性较高的优势植物物种，本研究以紫花苜蓿（Medicago sativa）、百脉根（Lotus corniculatus）、多变小冠花（Coronilla varia）、披碱草（Elymus dahuricum）、细茎冰草（Agropyron trachycaulum）和野牛草（Buchloe dactyloides）为试验材料，采用盆栽模拟试验进行不同浓度Cd胁迫处理，以0 mg·kg^-1Cd处理浓度为对照（CK），探究多梯度Cd胁迫对植物的富集特征及根系形态变化的影响，并评估其Cd耐性阈值。结果表明：不同浓度Cd胁迫下6种草本植物的生物量及根系形态均表现出“低促高抑”现象；不同物种对Cd的耐受能力不同，紫花苜蓿和多变小冠花对Cd的耐性阈值在50 mg·kg^-1到100 mg·kg^-1之间，百脉根、披碱草、细茎冰草和野牛草对Cd的耐性阈值在100 mg·kg^-1以上；在100 mg·kg^-1Cd胁迫下百脉根、披碱草和野牛草，可通过植物萃取的方式应用于重金属污染土壤的治理修复；细茎冰草在100 mg·kg^-1Cd胁迫下，根系富集系数仍然大于1，且根系生物量、耐性系数具有随着Cd胁迫加重不断上升的趋势，是较理想的修复重金属污染土壤的高耐高抗型草本植物材料。

关键词: 镉胁迫, 富集特征, 根形态特征, 耐性阈值

CLC Number:

S618.81

ZHANG Yang-yang, LI Xi-ming, GAO Peng, SONG Gui-long. Comparison of Tolerance and Enrichment Characteristic for Six Herbaceous Plant under Different Levels Cd Stress[J]. Acta Agrestia Sinica, 2021, 29(6): 1265-1276.

张杨杨, 李希铭, 高鹏, 宋桂龙. 不同浓度镉胁迫下6种草本植物的耐性及富集特征的比较[J]. 草地学报, 2021, 29(6): 1265-1276.

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Comparison of Tolerance and Enrichment Characteristic for Six Herbaceous Plant under Different Levels Cd Stress

不同浓度镉胁迫下6种草本植物的耐性及富集特征的比较

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