Reducing cadmium bioavailability and accumulation in vegetable by an alkalizing bacterial strain.

Reducing cadmium bioavailability and accumulation in vegetable by an alkalizing bacterial strain.
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DOI：
10.1016/j.scitotenv.2020.143596
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发表时间：
2020-11
期刊：
The Science of the total environment
影响因子：
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通讯作者：
Jun Zhang;Xin Wang;Lingxiao Zhang;F. Zhao
Jun Zhang;Xin Wang;Lingxiao Zhang;F. Zhao
中科院分区：
其他
文献类型：
--
作者：
Jun Zhang;Xin Wang;Lingxiao Zhang;F. Zhao

文献摘要

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农业土壤中的镉 (Cd) 污染是一个普遍存在的环境问题，可能影响食品安全和人类健康。需要有效的修复方法来降低土壤中镉的生物利用度和粮食作物中镉的积累。在本研究中，我们从镉污染土壤中分离出一株抗镉碱化细菌菌株XT-4，并评估其在镉生物修复中的潜在应用。根据菌株XT-4的形态、生理生化特征，结合16S rRNA基因序列分析，鉴定菌株XT-4为芽孢杆菌属成员。菌株 XT-4 显示出很强的提高 pH 值和降低 Cd 在培养基中溶解度的能力。采用温室盆栽试验，在镉污染的土壤上进行了菌株XT-4接种对小白菜（Brassica rapassp.chinensis）生长和镉积累的影响。接种提高了根际pH值，降低了土壤中CaCl2可提取的镉，并使小白菜食用部分的镉浓度降低了28-40%。结果表明，接种碱化菌株 XT-4 是提高根际 pH 值并减少镉污染酸性土壤中蔬菜作物对镉吸收的有效解决方案。
Cadmium (Cd) contamination in agricultural soils is a widespread environmental problem that can affect food safety and human health. Effective remediation methods are needed to reduce Cd bioavailability in soil and Cd accumulation in food crops. In the present study, we isolated a Cd-resistant and alkalizing bacterium strain XT-4 from a Cd-contaminated soil and evaluated its potential application in Cd bioremediation. Based on its morphological, physiological and biochemical characteristics, together with 16S rRNA gene sequence analysis, strain XT-4 was identified as a member of theBacillusgenus. Strain XT-4 showed a strong ability to increase the pH and decrease Cd solubility in the medium. A greenhouse-based pot experiment with a Cd-contaminated soil was conducted to evaluate the effect of strain XT-4 inoculation on the growth and Cd accumulation of the vegetable Pak choi (Brassica rapassp.chinensis). Inoculation increased the rhizosphere pH, decreased CaCl2-extractable Cd in the soil and decreased Cd concentration in the edible part of Pak choi by 28–40%. The results suggest that inoculation with alkalizing bacterial strain XT-4 represents an effective solution to increase rhizosphere pH and decrease Cd uptake by vegetable crops in Cd-contaminated acid soils.