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ARS Home » Pacific West Area » Albany, California » Plant Gene Expression Center » Research » Publications at this Location » Publication #386879

Research Project: Discovery of Plant Genetic Mechanisms Controlling Microbial Recruitment to the Root Microbiome

Location: Plant Gene Expression Center

Title: Peanut plant growth was altered by monocropping-associated microbial enrichment of rhizosphere microbiome

item LI, XIAOGANG - Hunan Agricultural University
item PANKE-BUISSE, KEVIN - Hunan Agricultural University
item YAO, XIAODONG - Hunan Agricultural University
item Coleman-Derr, Devin
item DING, CHANGFENG - Hunan Agricultural University
item WANG, XING-XIANG - Hunan Agricultural University
item RUAN, HONGHUA - Hunan Agricultural University

Submitted to: Plant and Soil
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 11/17/2019
Publication Date: 12/6/2019
Citation: Li, X., Panke-Buisse, K., Yao, X., Coleman-Derr, D.A., Ding, C., Wang, X., Ruan, H. 2019. Peanut plant growth was altered by monocropping-associated microbial enrichment of rhizosphere microbiome. Plant and Soil. 446:655–669.

Interpretive Summary: Repeated planting of the same or closely-related crop species often results in negative soil feedbacks, manifested as reduced plant growth. This is commonly attributed to accumulation of plant pathogenic organisms, but there is increasing evidence that other microbes may contribute as well. Since individual members of the bacterial soil microbiome display distinct preferences for specific root exudates, we hypothesize that enrichment of a small subset of bacterial species in the rhizosphere by monocropping will decrease overall diversity and thus negatively influence the performance of the crop.

Technical Abstract: Partial 16S rRNA gene amplicon sequence analysis revealed significant effects of cropping system on the bacterial composition of peanut rhizospheres. When added to peanut seedling rhizospheres, soil suspensions derived from monocropped plots produced a significant reduction in rhizosphere microbiome species richness (number of OTUs). Bacterial species including Sphingomonas sp., Herbaspirillum sp., and Arthrobacter sp. were enriched in peanut rhizosphere. However, monocropping-derived soil suspension inoculants showed significant deleterious effects on peanut development compared to rotation-derived inoculants. Further bioassays determined that some enriched bacterial strains that were isolated from the monocropping treatment repressed peanut hypocotyl extension.