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Cultivar-specific rhizosphere microbial community responses to cadmium-NaHCO3 stress in relation to cadmium accumulation in rice

文献类型： 外文期刊

作者： Zhao, Shouping 1 ; Gao, Na 1 ; Zhang, Qi 1 ; Xiao, Wendan 1 ; Chen, De 1 ; Huang, Miaojie 1 ; Ye, Xuezhu 1 ;

作者机构： 1.Zhejiang Acad Agr Sci, Inst Agroprod Safety & Nutr, State Key Lab Managing Biot & Chem Threats Qual &, Key Lab Informat Traceabil Agr Prod, Hangzhou 310021, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Agroprod Safety & Nutr, Desheng Middle Rd 298, Hangzhou 310021, Zhejiang, Peoples R China

关键词： Cadmium; Alkali stress; Rice; Cultivar-specific; Microbial community

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：11.3； 五年影响因子：12.4 ）

ISSN： 0304-3894

年卷期： 2025 年 488 卷

页码：

收录情况： SCI

摘要： Understanding the response of rhizosphere microbial communities to cadmium (Cd)-alkali stress from a cultivarspecific perspective is important for regulating Cd accumulation in rice. Pot experiments were conducted using low-Cd-accumulating Y15 and high-Cd-accumulating Y40, by addition of 0.0 %, 0.3 %, and 0.6 % NaHCO3 (A0, A1, and A2, respectively) to Cd-contaminated (0.62 mg/kg) soil. The plant Cd and soil DTPA-Cd decreased significantly with increasing NaHCO3 dose for Y15, but not for Y40. Cd-NaHCO3 stress reduced the richness and evenness of rhizosphere microbial communities, especially in A1 of Y15 and A2 of Y40. The Y15 rhizosphere shifted from the equal abundance of Proteobacteria and Firmicutes under A0 to the predominance of Proteobacteria and enriched with growth-promoting Alphaproteobacteria (Roseomonas, Brevundimonas), Cd-fixating Firmicute (Bacillus), and nitrogen-cycling Bdellovibrionota (Peredibacter) under A1 and A2. The Y40 rhizosphere contained comparable Proteobacteria and Firmicutes under A0 and A1; under A2, it was dominated by Proteobacteria and enriched with Cd-activating Bacteroidota (Barnesiella, Taibaiella), lignin-degrading Chloroflexi (Anaerolinea), and Cd-fixating or growth-promoting Gammaproteobacteria (Lysobacter, Pseudomonadales, Acinetobacter). The Y40 and Y15 rhizosphere exhibited laziness in multiple FAPROTAX functions, and were activated in 11 and 18 KGEE pathways including amino acid metabolism in A2 and A1, respectively. The results provide new insights into Cd-alkali tolerance in rice.

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