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Long-Term Manure Application Changes Bacterial Communities in Rice Rhizosphere and Arsenic Speciation in Rice Grains

文献类型： 外文期刊

作者： Tang, Xianjin 1 ; Zou, Lina 3 ; Su, Shiming 4 ; Lu, Yanhong 5 ; Zhai, Weiwei 3 ; Manzoor, Maria 1 ; Liao, Yulin 5 ; Nie, 1 ;

作者机构： 1.Zhejiang Univ, Coll Environm & Resource Sci, MOE Key Lab Environm Remediat & Ecosyst Hlth, Hangzhou 310058, Peoples R China

2.Zhejiang Univ, Coll Environm & Resource Sci, Inst Soil & Water Resources & Environm Sci, Hangzhou 310058, Peoples R China

3.Zhejiang Univ, Coll Environm & Resource Sci, Zhejiang Prov Key Lab Agr Resources & Environm, Hangzhou 310058, Peoples R China

4.Chinese Acad Agr Sci, Inst Environm & Sustainable Dev Agr, Key Lab Agroenvironm, Minist Agr, Beijing 100081, Peoples R China

5.Hunan Acad Agr Sci, Soil & Fertilizer Inst Hunan Prov, Changsha 410125, Peoples R China

期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：9.028； 五年影响因子：9.922 ）

ISSN： 0013-936X

年卷期： 2021 年 55 卷 3 期

页码：

收录情况： SCI

摘要： Bioavailability and speciation of arsenic (As) are impacted by fertilization and bacteria in the rice rhizosphere. In this study, we investigated the effects of long-term manure application on As bioavailability, microbial community structure, and functional genes in a rice paddy field. The results showed that manure application did not affect total As in the soil but increased soluble As forms by 19%, increasing arsenite (As(III)) accumulation in rice grains and roots by 34 and 64% compared to a control. A real-time quantitative polymerase chain reaction (qPCR) and high-throughput sequencing analysis demonstrated that manure application increased the relative abundance of Rhizobium, Burkholderia, Sphingobium, and Sphingomonas containing arsenate reductase genes (arsC) in the rhizosphere soil, consistent with the 529% increase in arsC, which may have promoted arsenate (As(V)) reduction and increased As availability in pore water. In addition, manure application significantly altered the iron (Fe)-plaque microbial community structure and diversity. The microbes, particularly, Bradyrhizobium, Burkholderia, and Ralstonia, were mostly associated with As, Fe, and sulfur (S) cycles. This result was consistent with changes in the functional genes related to As, Fe, and S transformation. Although manure application promoted As(V) reduction (arsC) in Fe-plaque by 682%, it inhibited Fe and S reduction by decreasing FeIII reduction bacteria (Geobacteraceae) and the sulfate-reducing gene (dsrA) abundance. Further, manure application changed the composition of the microbial community that contained the arsC gene. In short, caution needs to be excised even in the soil with a low As concentration as manure application increased As(III) accumulation in rice grains.

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