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Local adaptation of both plant and pathogen: an arms‐race compromise in switchgrass rust

Journal Article · · New Phytologist
DOI:https://doi.org/10.1111/nph.70313· OSTI ID:2574354
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];  [3];  [4]
  1. North Carolina State University, Raleigh, NC (United States); Michigan State Univ., East Lansing, MI (United States)
  2. Cornell Univ., Ithaca, NY (United States). Baker Lab.
  3. Univ. of Texas, Austin, TX (United States)
  4. Michigan State Univ., East Lansing, MI (United States)
  5. Univ. of Missouri, Columbia, MO (United States)
  6. South Dakota State Univ., Brookings, SD (United States)
  7. USDA‐NRCS, Kingsville, TX (United States). Kika de la Garza Plant Materials Center
  8. Univ. of Nebraska, Lincoln, NE (United States)
  9. Texas A & M AgriLife Research and Extension Center, Overton, TX (United States)
  10. Oklahoma State Univ., Stillwater, OK (United States)
  11. US Dept. of Agriculture (USDA), Temple, TX (United States). Agricultural Research Service (ARS)
  12. Argonne National Laboratory (ANL), Argonne, IL (United States)
  13. HudsonAlpha Institute for Biotechnology, Huntsville, AL (United States); USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)

In coevolving species, parasites locally adapt to host populations as hosts locally adapt to resist parasites. Parasites often outpace host local adaptation since they have rapid life cycles, but host diversity, the strength of selection, and external environmental influence can result in complex outcomes. To better understand local adaptation in host–parasite systems, we examined locally adapted switchgrass (Panicum virgatum), and its leaf rust pathogen (Puccinia novopanici) across a latitudinal range in North America. We grew switchgrass genotypes in 10 replicated multiyear common gardens, measuring rust severity from natural infection in a ‘host reciprocal transplant’ framework for testing local adaptation. We conducted genome-wide association mapping to identify genetic loci associated with rust severity. Genetically differentiated rust populations were locally adapted to northern and southern switchgrass, despite host local adaptation to environmental conditions in the same regions. Rust resistance was polygenic, and distinct loci were associated with rust severity in the north and south. We narrowed a previously identified large-effect quantitative trait locus for rust severity to a candidate YELLOW STRIPE-LIKE gene and linked numerous other loci to defense-related genes. Overall, our results suggest that both hosts and parasites can be simultaneously locally adapted, especially when parasites impose less selection than other environmental factors.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States); USDOE Joint Genome Institute (JGI), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
Grant/Contract Number:
AC02-05CH11231; SC0018409; SC0014156; AC02-06CH11357; SC0017883
OSTI ID:
2574354
Journal Information:
New Phytologist, Journal Name: New Phytologist; ISSN 1469-8137; ISSN 0028-646X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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