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Title: Impacts of directed evolution and soil management legacy on the maize rhizobiome

Abstract

Domestication and agricultural intensification dramatically altered maize and its cultivation environment. Changes in maize genetics (G) and environmental (E) conditions increased productivity under high-synthetic-input conditions. However, novel selective pressures on the rhizobiome may have incurred undesirable tradeoffs in organic agroecosystems, where plants obtain nutrients via microbially mediated processes including mineralization of organic matter. Using twelve maize genotypes representing an evolutionary transect (teosintes, landraces, inbred parents of modern elite germplasm, and modern hybrids) and two agricultural soils with contrasting long-term management, here we integrated analyses of rhizobiome community structure, potential microbe-microbe interactions, and N-cycling functional genes to better understand the impacts of maize evolution and soil management legacy on rhizobiome recruitment. We show complex shifts in rhizobiome communities during directed evolution of maize (defined as the transition from teosinte to modern hybrids), with a larger effect of domestication (teosinte to landraces) than modern breeding (inbreds to hybrids) on rhizobiome structure and greater impacts of modern breeding on potential microbe-microbe interactions. Rhizobiome structure was significantly correlated with plant nutrient composition. Furthermore, plant biomass and nutrient content were affected by G x E interactions in which teosinte and landrace genotypes had better relative performance in the organic legacy soil than inbred and modernmore » genotypes. The abundance of six N-cycling genes of relevance for plant nutrition and N loss pathways did not significantly differ between teosinte and modern rhizospheres in either soil management legacy. These results provide insight into the potential for improving maize adaptation to organic systems and contribute to interdisciplinary efforts toward developing resource-efficient, biologically based agroecosystems.« less

Authors:
 [1];  [2];  [3];  [4];  [1]
  1. Univ. of California, Davis, CA (United States). Dept. of Plant Sciences
  2. Univ. of California, Davis, CA (United States). Dept. of Land, Air, and Water Resources
  3. USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
  4. Univ. of Illinois at Urbana-Champaign, IL (United States). Dept. of Natural Resources and Environmental Sciences
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDA
OSTI Identifier:
1635192
Grant/Contract Number:  
AC02-05CH11231; CA-D-PLS-2332-H
Resource Type:
Accepted Manuscript
Journal Name:
Soil Biology and Biochemistry
Additional Journal Information:
Journal Volume: 145; Journal Issue: C; Journal ID: ISSN 0038-0717
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES; agroecosystem; breeding; domestication; genotype-by-environment interaction; maize; rhizosphere

Citation Formats

Schmidt, Jennifer E., Mazza Rodrigues, Jorge L., Brisson, Vanessa L., Kent, Angela, and Gaudin, Amélie C. M. Impacts of directed evolution and soil management legacy on the maize rhizobiome. United States: N. p., 2020. Web. doi:10.1016/j.soilbio.2020.107794.
Schmidt, Jennifer E., Mazza Rodrigues, Jorge L., Brisson, Vanessa L., Kent, Angela, & Gaudin, Amélie C. M. Impacts of directed evolution and soil management legacy on the maize rhizobiome. United States. https://doi.org/10.1016/j.soilbio.2020.107794
Schmidt, Jennifer E., Mazza Rodrigues, Jorge L., Brisson, Vanessa L., Kent, Angela, and Gaudin, Amélie C. M. Fri . "Impacts of directed evolution and soil management legacy on the maize rhizobiome". United States. https://doi.org/10.1016/j.soilbio.2020.107794. https://www.osti.gov/servlets/purl/1635192.
@article{osti_1635192,
title = {Impacts of directed evolution and soil management legacy on the maize rhizobiome},
author = {Schmidt, Jennifer E. and Mazza Rodrigues, Jorge L. and Brisson, Vanessa L. and Kent, Angela and Gaudin, Amélie C. M.},
abstractNote = {Domestication and agricultural intensification dramatically altered maize and its cultivation environment. Changes in maize genetics (G) and environmental (E) conditions increased productivity under high-synthetic-input conditions. However, novel selective pressures on the rhizobiome may have incurred undesirable tradeoffs in organic agroecosystems, where plants obtain nutrients via microbially mediated processes including mineralization of organic matter. Using twelve maize genotypes representing an evolutionary transect (teosintes, landraces, inbred parents of modern elite germplasm, and modern hybrids) and two agricultural soils with contrasting long-term management, here we integrated analyses of rhizobiome community structure, potential microbe-microbe interactions, and N-cycling functional genes to better understand the impacts of maize evolution and soil management legacy on rhizobiome recruitment. We show complex shifts in rhizobiome communities during directed evolution of maize (defined as the transition from teosinte to modern hybrids), with a larger effect of domestication (teosinte to landraces) than modern breeding (inbreds to hybrids) on rhizobiome structure and greater impacts of modern breeding on potential microbe-microbe interactions. Rhizobiome structure was significantly correlated with plant nutrient composition. Furthermore, plant biomass and nutrient content were affected by G x E interactions in which teosinte and landrace genotypes had better relative performance in the organic legacy soil than inbred and modern genotypes. The abundance of six N-cycling genes of relevance for plant nutrition and N loss pathways did not significantly differ between teosinte and modern rhizospheres in either soil management legacy. These results provide insight into the potential for improving maize adaptation to organic systems and contribute to interdisciplinary efforts toward developing resource-efficient, biologically based agroecosystems.},
doi = {10.1016/j.soilbio.2020.107794},
journal = {Soil Biology and Biochemistry},
number = C,
volume = 145,
place = {United States},
year = {Fri Apr 10 00:00:00 EDT 2020},
month = {Fri Apr 10 00:00:00 EDT 2020}
}

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