Abstract
Plants intimately associate with diverse bacteria. Plant-associated bacteria have ostensibly evolved genes that enable them to adapt to plant environments. However, the identities of such genes are mostly unknown, and their functions are poorly characterized. We sequenced 484 genomes of bacterial isolates from roots of Brassicaceae, poplar, and maize. We then compared 3,837 bacterial genomes to identify thousands of plant-associated gene clusters. Genomes of plant-associated bacteria encode more carbohydrate metabolism functions and fewer mobile elements than related non-plant-associated genomes do. We experimentally validated candidates from two sets of plant-associated genes: one involved in plant colonization, and the other serving in microbe-microbe competition between plant-associated bacteria. We also identified 64 plant-associated protein domains that potentially mimic plant domains; some are shared with plant-associated fungi and oomycetes. This work expands the genome-based understanding of plant-microbe interactions and provides potential leads for efficient and sustainable agriculture through microbiome engineering.
Original language | English |
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Pages (from-to) | 138-150 |
Number of pages | 13 |
Journal | Nature Genetics |
Volume | 50 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1 2018 |
Funding
The work conducted by the US Department of Energy Joint Genome Institute, a DOE Office of Science User Facility, is supported by the Office of Science of the US Department of Energy under contract no. DE-AC02-05CH11231. J.L.D. and S.G.T. were supported by NSF INSPIRE grant IOS-1343020, and J.L.D. was also supported by DOE–USDA Feedstock Award DE-SC001043 and by the Office of Science (BER), US Department of Energy, grant no. DE-SC0014395. S.H.P. was supported by NIH Training Grant T32 GM067553-06 and was a Howard Hughes Medical Institute (HHMI) International Student Research Fellow. D.S.L. was supported by NIH Training Grant T32 GM07092-34. J.L.D. is an Investigator of the HHMI, supported by the HHMI and the Gordon and Betty Moore Foundation (GBMF3030). M.E.F. was supported by NIH Dr. Ruth L. Kirschstein NRSA Fellowship F32-GM112345. D.A.P. and T.-Y.L. were supported by the Genomic Science Program, US Department of Energy, Office of Science, Biological and Environmental Research as part of the Oak Ridge National Laboratory Plant Microbe Interfaces Scientific Focus Area (http://pmi.ornl.gov) and Plant Feedstock Genomics Award DE-SC001043. Oak Ridge National Laboratory is managed by UT-Battelle, LLC, for the US Department of Energy under contract DE-AC05-00OR22725. J.A.V. was supported by a SystemsX.ch grant (Micro2X) and a European Research Council (ERC) advanced grant (PhyMo). We thank I. Bertani, C. Bez, R. Bowers, D. Burstein, A. Chun Chen, D. Chiniquy, B. Cole, O. Cohen, A. Copeland, J. Eisen, E. Eloe-Fadrosh, M. Hadjithomas, O. Finkel, H. Schnitzel Meule Fux, N. Ivanova, J. Knelman, R. Malmstrom, R. Perez-Torres, D. Salomon, R. Sorek, T. Mucyn, R. Seshadri, T.K. Reddy, L. Ryan, and H. Sberro Livnat for general help, text editing, and ideas for this work. We thank R. Walcott (University of Georgia, Athens, GA, USA) for providing the Acidovorax citrulli VasD mutant strain.