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Resistance of microbial community and its functional sensitivity in the rhizosphere hotspots to drought

文献类型： 外文期刊

作者： Zhang, Xuechen 1 ; Myrold, David D. 4 ; Shi, Lingling 2 ; Kuzyakov, Yakov 7 ; Dai, Hongcui 1 ; Hoang, Duyen Thi Thu 8 ;

作者机构： 1.Shandong Acad Agr Sci, Crop Res Inst, Jinan 250100, Peoples R China

2.Univ Gottingen, Dept Biogeochem Agroecosyst, Gottingen, Germany

3.Christian Albrechts Univ Kiel, Inst Phytopathol, Dept Soil & Plant Microbiome, Kiel, Germany

4.Oregon State Univ, Dept Crop & Soil Sci, Corvallis, OR 97331 USA

5.Chinese Acad Sci, Kunming Inst Bot, Key Lab Econ Plants & Biotechnol, 132 Lanhei Rd, Kunming 650201, Yunnan, Peoples R China

6.China & East Asia Off, World Agroforestry Ctr, 132 Lanhei Rd, Kunming 650201, Peoples R China

7.Univ Gottingen, Dept Agr Soil Sci, Dept Soil Sci Temperate Ecosyst, Gottingen, Germany

8.Vietnam Natl Univ, Vietnam Japan Univ, Master Climate Change & Dev Program, Hanoi, Vietnam

9.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

10.Northwest A&F Univ, Coll Resources & Environm, Yangling 712100, Shaanxi, Peoples R China

11.RUDN Univ, Agrotechnol Inst, Moscow 117198, Russia

12.Kazan Fed Univ, Inst Environm Sci, Kazan 420049, Russia

关键词： Drought; Rhizosphere hotspots and coldspots; Functional genes; Resistance

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：7.609； 五年影响因子：8.312 ）

ISSN： 0038-0717

年卷期： 2021 年 161 卷

页码：

收录情况： SCI

摘要： Climate change impacts soil microbial communities, activities and functionality. Nonetheless, responses of the microbiome in soil microenvironments with contrasting substrate availability in the rhizosphere to climatic stresses such as drought are largely unknown. To fill this knowledge gap, we coupled soil zymography with sitespecific micro-sampling of the soil and subsequent high-throughput sequencing. This helped identify how the bacterial community structure and the genes encoding N-cycling enzymes (leucine aminopeptidase and chitinase) in rhizosphere hotspots and coldspots (microsites with activities in the range of bulk soil but localized within the rhizosphere) of maize respond to drought (20% WHC, two weeks). The elevated activities of leucine aminopeptidase and chitinase in rhizosphere hotspots were caused by the tight collaborative relationships between bacteria and their stable network structure rather than by any significant shift in bacterial community structure or enzyme-encoding gene copies. Despite the similarity in bacterial community structure in soil under drought and optimal moisture, functional predictions indicated the increased relative abundance of genera belonging to Actinobacteria capable of leucine aminopeptidase and chitinase production, especially Streptomyces, Nocardioides, Marmoricola, and Knoellia. Accordingly, the number of gene copies encoded by Actinobacteria for these two enzymes increased by 5.0-17% under drought. Among the bacteria with increased relative abundance under drought, Luedemannella played a crucial role in mediating nutrients and energy fluxes between bacteria. This was reflected in a 35-70% increase in leucine aminopeptidase and chitinase activities under drought. The resistance of enzyme activities to drought was higher in hotpots than that in coldspots. These results revealed that rhizosphere bacterial community composition remained stable, and that the number of gene copies encoded by Actinobacteria responsible for N-cycling enzymes increased under drought. The expected reduction of processes of N cycle was absent. Instead, bacteria increased N mining rate in those hotspots remaining active despite water scarcity.

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