Plant Diversity and Fertilizer Management Shape the Belowground Microbiome of Native Grass Bioenergy Feedstocks

Revillini, Daniel; Wilson, Gail W.  T.; Miller, R. Michael; Lancione, Ryan; Johnson, Nancy Collins

doi:10.3389/fpls.2019.01018

Title: Plant Diversity and Fertilizer Management Shape the Belowground Microbiome of Native Grass Bioenergy Feedstocks

Journal Article · Wed Aug 14 00:00:00 EDT 2019 · Frontiers in Plant Science

DOI:https://doi.org/10.3389/fpls.2019.01018· OSTI ID:1628295

Revillini, Daniel ^[1]; Wilson, Gail W. T. ^[2]; Miller, R. Michael ^[3]; Lancione, Ryan ^[4]; Johnson, Nancy Collins ^[5]

Northern Arizona Univ., Flagstaff, AZ (United States). Dept. of Biological Sciences; Univ. of Miami, FL (United States). Dept. of Biology
Oklahoma State Univ., Stillwater, OK (United States). Dept. of Natural Resource Ecology, Management
Argonne National Lab. (ANL), Argonne, IL (United States). Environmental Science Division
Northern Arizona Univ., Flagstaff, AZ (United States). Dept. of Biological Sciences
Northern Arizona Univ., Flagstaff, AZ (United States). Dept. of Biological Sciences and School of Earth, Sustainability

Plants may actively cultivate microorganisms in their roots and rhizosphere that enhance their nutrition. To develop cropping strategies that substitute mineral fertilizers for beneficial root symbioses, we must first understand how microbial communities associated with plant roots differ among plant taxa and how they respond to fertilization. Arbuscular mycorrhizal (AM) fungi and rhizobacteria are of particular interest because they enhance nutrient availability to plants and perform a suite of nutrient cycling functions. The purpose of this experiment is to examine the root and soil microbiome in a longterm switchgrass (Panicum virgatum) biofuel feedstock experiment and determine how AM fungi and rhizobacteria respond to plant diversity and soil fertility. We hypothesize that intra- and interspecific plant diversity, nitrogen fertilization (+N), and their interaction will influence the biomass and community composition of AM fungi and rhizobacteria. We further hypothesize that +N will reduce the abundance of nitrogenase-encoding nifH genes on the rhizoplane. Roots and soils were sampled from three switchgrass cultivars (Cave-in-Rock, Kanlow, Southlow) grown in monoculture, intraspecific mixture, and interspecific planting mixtures with either Andropogon gerardii or diverse native tallgrass prairie species. Molecular sequencing was performed on root and soil samples, fatty acid extractions were assessed to determine microbial biomass, and quantitative polymerase chain reaction (qPCR) was performed on nifH genes from the rhizoplane. Sequence data determined core AM fungal and bacterial microbiomes and indicator taxa for plant diversity and +N treatments. We found that plant diversity and +N influenced AM fungal biomass and community structure. Across all plant diversity treatments, +N reduced the biomass of AM fungi and nifH gene abundance by more than 40%. The AM fungal genus Scutellospora was an indicator for +N, with relative abundance significantly greater under +N and in monoculture treatments. Community composition of rhizobacteria was influenced by plant diversity but not by +N. Verrucomicrobia and Proteobacteria were the dominant bacterial phyla in both roots and soils. Our findings provide evidence that soil fertility and plant diversity structure the root and soil microbiome. Optimization of soil communities for switchgrass production must take into account differences among cultivars and their unique responses to shifts in soil fertility.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Northern Arizona Univ., Flagstaff, AZ (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USDA: National Institute of Food and Agriculture (NIFA)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1628295

Journal Information:: Frontiers in Plant Science, Vol. 10; ISSN 1664-462X

Publisher:: Frontiers Research FoundationCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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