Effect of bacterial intra-species community interactions on the production and activity of volatile organic compounds
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https://doi.org/10.1007/s42832-020-0054-2
RESEARCH ARTICLE
Effect of bacterial intra-species community interactions on the production and activity of volatile organic compounds Jianning Wang{, Xinlan Mei{, Zhong Wei, Waseem Raza*, Qirong Shen 1 Jiangsu Provincial Key Lab for Organic Solid Waste Utilization, National Engineering Research Center for Organic-based Fertilizers, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, Nanjing Agricultural University, Nanjing 210095, China
ARTICLE INFO
ABSTRACT
Article history:
Microorganisms experience intra- and inter-species interactions in the soil, and how these
Received March 31, 2020
interactions affect the production of microbial volatile organic compounds (VOCs) is still not
Revised June 9, 2020 Accepted July 15, 2020
well-known. Here we evaluated the production and activity of microbial VOCs as driven by bacterial intra-species community interactions. We set up bacterial communities of increasing
Keywords:
biodiversity out of 1–4 strains each of the Gram-positive Bacillus and Gram-negative Pseudomonas genera. We evaluated the ability of each community to provide two VOC-
Biodiversity
mediated services, pathogen suppression and plant-growth promotion and then correlated
Community richness
these services to the production of VOCs by each community. The results showed that an
Ecosystem functioning
increase in community richness from 1 to 4 strains of both genera increased VOC-mediated
Intra-species interactions
pathogen suppression and plant-growth promotion on agar medium and in the soil, which was
Plant–microbe interactions
positively correlated with the production of pathogen suppressing and plant growth-promoting VOCs. Pseudomonas strains maintained while Bacillus strains reduced community productivity with an increase in community richness and produced eight novel VOCs compared with the monocultures. These results revealed that intra-species interactions may vary between Gram-negative and Gram-positive species but improved VOC-mediated functioning with respect to pathogen suppression and plant-growth promotion by affecting the amount and diversity of produced VOCs potentially affecting plant disease outcomes. © Higher Education Press 2020
1 Introduction Plant roots are associated with a dense multispecies community that provides multiple benefits to plants, including plant growth stimulation and pathogen suppression (Mendes et al., 2015). The rhizosphere microbiome is often approached as the community of microbes in direct contact with plant host, mediated by diffusible molecules and contact-mediated
* Corresponding author E-mail address: [email protected] (W. Raza) { Jianning Wang and Xinlan Mei equally contributed to this manuscript.
interactions (Westhoff et al., 2017). Recent studies have demonstrated that volatile organic compounds (VOCs) produced by microorganisms can have a deep impact on a range of organisms, including plants and pathogens (Schmidt et al., 2015). The VOCs are low molecular weight a
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