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Biofilm-overproducing Bacillus subtilis B12ΔYwcc decreases cd uptake in Chinese cabbage through increasing cd-immobilizing related gene abundance and root surface colonization

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Journal of Environmental Sciences 2022年第10期34卷 84-93页

作者： Yanyan Ge Zhanbiao Ge Jinwei Zheng Xiafang Sheng Linyan He College of Life Sciences Nanjing Agricultural UniversityKey Laboratory of Agricultural and Environmental MicrobiologyMinistry of AgricultureNanjing 210095China

Biofilm-producing bacteria can decrease cd uptake in vegetables, but mechanisms underlying this effect are poorly characterized. In this study, two mutant strains B12ΔYwcc and B12ΔSlr R were constructed from a biofilm-producing Bacillus subtilis strain B12. Then, the impacts of strain B12 and its high biofilm-producing mutant strain B12ΔYwcc and low biofilmproducing mutant strain B12ΔSlr R on cd availability and uptake in Chinese cabbage and the related mechanisms were investigated in the cd-polluted soil. Strain B12 and its mutants B12ΔYwcc and B12ΔSlr R increased the dry biomasses of edible tissues by 54%–130% compared with the controls. Strain B12 and its mutant B12ΔYwcc reduced the soil available cd content by 36%–50% and root and edible tissue cd contents by 23%–50% compared with the controls. Furthermore, the mutant strain B12ΔYwcc reduced the edible tissue cd content by40% and increased the polysaccharide content by 23%, invertase activity by 139%, and gene copies of the cum A by 4.5-fold, eps A by 7.1-fold, and cad A by 4.3-fold, which were involved in cd adsorption in the rhizosphere soils, respectively, compared with strain B12. The polysaccharide content and cum A, eps A, and cad A gene copy numbers showed significantly reverse correlations with the available cd content. Notably, the mutant strain B12ΔYwcc showed better ability to colonize the vegetable root surface than strain B12. These findings demonstrated that the biofilm-overproducing mutant strain B12ΔYwcc increased the polysaccharide production and cd-immobilizing related cum A, eps A, and cad A gene copies, resulting in lower cd availability and accumulation in Chinese cabbage in the cd-polluted soil.

关键词： Biofilm-producing Bacillus subtilis Mutant strain with biofilm overproduction cd uptake in vegetable cd-stabilizing related genes Bacterial colonization and biofilm formation

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