Heavy metal-immobilizing bacteria increase the biomass and reduce the Cd and Pb uptake by pakchoi (Brassica chinensis L.) in heavy metal-contaminated soil

化学 芸苔属 细菌 环境化学 生物量(生态学) 土壤污染 金属 植物 污染 生物 重金属 农学 生态学 遗传学 有机化学
作者
Hui Han,Hong Jie Cai,Xiaoyu Wang,Xiaomin Hu,Zhaojin Chen,Lunguang Yao
出处
期刊:Ecotoxicology and Environmental Safety [Elsevier BV]
卷期号:195: 110375-110375 被引量:78
标识
DOI:10.1016/j.ecoenv.2020.110375
摘要

Microbial immobilization is a novel and environmentally friendly technology that uses microbes to reduce metal availability in soil and accumulation of heavy metals in plants. We used urea agar plates to isolate urease-producing bacteria from the rhizosphere soil of pakchoi in Cd- and Pb-contaminated farmland and investigated their effects on Cd and Pb accumulation in pakchoi and the underlying mechanisms. The results showed that two urease-producing bacteria, Bacillus megaterium N3 and Serratia liquefaciens H12, were identified by screening. They had higher ability to produce urease (57.5 ms cm-1 min-1 OD600-1 and 76.4 ms cm-1 min-1 OD600-1, respectively). The two strains allowed for the immobilization of Cd and Pb by extracellular adsorption, bioprecipitation, and increasing the pH (from 6.94 to 7.05-7.09), NH4+ content (69.1%-127%), and NH4+/NO3- ratio (from 1.37 to 1.67-2.11), thereby reducing the DTPA-extractable Cd (35.3%-58.8%) and Pb (37.8%-62.2%) contents in the pakchoi rhizosphere soils and the Cd (76.5%-79.7%) and Pb (76.3%-83.5%) contents in the leaves (edible tissue) of pakchoi. The strains were highly resistant to heavy metal toxicity; produced IAA, siderophores and abscisic acid; and increased the NH4+/NO3- ratio, which might be related to the two strains protectiing pakchoi against the toxic effect of Cd and Pb and increasing pakchoi biomass. Thus, the results were supposed to strain resources and a theoretical basis for the remediation of Cd- and Pb-contaminated farmlands for the safe production of vegetables.
最长约 10秒,即可获得该文献文件

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
刚刚
1秒前
1秒前
1秒前
2秒前
2秒前
科研助手6应助能干的吐司采纳,获得10
2秒前
3秒前
CipherSage应助123采纳,获得10
3秒前
3秒前
谦让之云发布了新的文献求助10
4秒前
嗯哼发布了新的文献求助10
4秒前
小蘑菇应助明亮飞双采纳,获得10
5秒前
why发布了新的文献求助10
5秒前
粥粥完成签到 ,获得积分10
5秒前
郭小宝发布了新的文献求助10
5秒前
6秒前
7秒前
白日梦完成签到,获得积分20
7秒前
7秒前
大模型应助张张张采纳,获得10
7秒前
ding应助亭亭1234采纳,获得10
8秒前
8秒前
9秒前
9秒前
10秒前
善学以致用应助苏利文采纳,获得30
11秒前
11秒前
11秒前
xmj完成签到,获得积分10
11秒前
12秒前
aaaaa发布了新的文献求助10
13秒前
123发布了新的文献求助10
15秒前
健忘傲柏完成签到,获得积分10
15秒前
顾矜应助mariawang采纳,获得10
16秒前
可爱的从寒完成签到,获得积分10
16秒前
hyx完成签到,获得积分10
16秒前
明亮飞双发布了新的文献求助10
17秒前
高大一一完成签到,获得积分10
17秒前
图南发布了新的文献求助10
17秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
‘Unruly’ Children: Historical Fieldnotes and Learning Morality in a Taiwan Village (New Departures in Anthropology) 400
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3988786
求助须知:如何正确求助?哪些是违规求助? 3531116
关于积分的说明 11252493
捐赠科研通 3269766
什么是DOI,文献DOI怎么找? 1804771
邀请新用户注册赠送积分活动 881870
科研通“疑难数据库(出版商)”最低求助积分说明 809021