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Reduced chemodiversity suppresses rhizosphere microbiome functioning in the mono-cropped agroecosystems

文献类型： 外文期刊

作者： Li, Pengfa 1 ; Liu, Jia 3 ; Saleem, Muhammad 4 ; Li, Guilong 1 ; Luan, Lu 1 ; Wu, Meng 1 ; Li, Zhongpei 1 ;

作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

2.Nanjing Agr Univ, Coll Life Sci, Dept Microbiol, Key Lab Microbiol Agr Environm,Minist Agr, Nanjing 210095, Peoples R China

3.Jiangxi Acad Agr Sci, Soil & Fertilizer & Resources & Environm Inst, Nanchang 330200, Jiangxi, Peoples R China

4.Alabama State Univ, Dept Biol Sci, Montgomery, AL 36104 USA

关键词： Rhizodeposits; Chemodiversity; DNA-SIP; Microbiome functioning; Mono-cropped agroecosystem

期刊名称：MICROBIOME （ 影响因子：16.837； 五年影响因子：19.813 ）

ISSN： 2049-2618

年卷期： 2022 年 10 卷 1 期

页码：

收录情况： SCI

摘要： Background: Rhizodeposits regulate rhizosphere interactions, processes, nutrient and energy flow, and plantmicrobe communication and thus play a vital role in maintaining soil and plant health. However, it remains unclear whether and how alteration in belowground carbon allocation and chemodiversity of rhizodeposits influences microbiome functioning in the rhizosphere ecosystems. To address this research gap, we investigated the relationship of rhizosphere carbon allocation and chemodiversity with microbiome biodiversity and functioning during peanut (Arachis hypogaea) continuous mono-cropping. After continuously labeling plants with (CO2)-C-13, we studied the chemodiversity and composition of rhizodeposits, along with the composition and diversity of active rhizosphere microbiome using metabolomic, amplicon, and shotgun metagenomic sequencing approaches based on DNA stable-isotope probing (DNA-SIP). Results: Our results indicated that enrichment and depletion of rhizodeposits and active microbial taxa varied across plant growth stages and cropping durations. Specifically, a gradual decrease in the rhizosphere carbon allocation, chemodiversity, biodiversity and abundance of plant-beneficial taxa (such as Gemmatimonas, Streptomyces, Ramlibacter, and Lysobacter), and functional gene pathways (such as quorum sensing and biosynthesis of antibiotics) was observed with years of mono-cropping. We detected significant and strong correlations between rhizodeposits and rhizosphere microbiome biodiversity and functioning, though these were regulated by different ecological processes. For instance, rhizodeposits and active bacterial communities were mainly governed by deterministic and stochastic processes, respectively. Overall, the reduction in carbon deposition and chemodiversity during peanut continuous mono-cropping tended to suppress microbial biodiversity and its functions in the rhizosphere ecosystem. Conclusions: Our results, for the first time, provide the evidence underlying the mechanism of rhizosphere microbiome malfunctioning in mono-cropped systems. Our study opens new avenues to deeply disentangle the complex plant-microbe interactions from the perspective of rhizodeposits chemodiversity and composition and will serve to guide future microbiome research for improving the functioning and services of soil ecosystems.

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