Abstract
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.
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Claims 6
Claim · model-written summary
Genetically differentiated rust populations were locally adapted to northern and southern switchgrass.
- Taxon
- switchgrass
Panicum virgatume0 - Interactor
- rust populationse0pathogen
- Outcome
- rust populations were locally adaptede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genetically differentiated rust populations were locally adapted to northern and southern switchgrass”
Claim · model-written summary
Switchgrass hosts were locally adapted to environmental conditions in the same regions.
- Taxon
- switchgrassPanicum virgatumt0
- Outcome
- host local adaptatione0
- Setting
- same regionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“host local adaptation to environmental conditions in the same regions”
t0“switchgrass”
Claim · model-written summary
Switchgrass rust resistance was polygenic.
- Taxon
- switchgrassPanicum virgatumt0
- Outcome
- Rust resistance was polygenice0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rust resistance was polygenic”
t0“switchgrass”
Claim · model-written summary
Different genetic loci were associated with rust severity in the north and south.
- Taxon
- switchgrassPanicum virgatumt0
- Gene
- distinct locie0
- Outcome
- rust severitye0
- Setting
- north and southe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“distinct loci were associated with rust severity in the north and south”
t0“switchgrass”
Claim · model-written summary
A large effect rust severity QTL was narrowed to a candidate YELLOW STRIPE-LIKE gene.
- Taxon
- switchgrassPanicum virgatumt0
- Gene
- YELLOW STRIPE-LIKE genee0
- Outcome
- narrowed a previously identified large-effect quantitative trait locus for rust severitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“We narrowed a previously identified large-effect quantitative trait locus for rust severity to a candidate YELLOW STRIPE-LIKE gene”
t0“switchgrass”
Claim · model-written summary
Numerous other loci were linked to defense related genes.
- Taxon
- switchgrassPanicum virgatumt0
- Gene
- numerous other locie0
- Outcome
- defense-related genese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“linked numerous other loci to defense-related genes”
t0“switchgrass”