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The genetics of divergence and reproductive isolation between ecotypes of Panicum hallii Public Deposited

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https://ir.library.oregonstate.edu/concern/articles/q237ht59c

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  • The process of plant speciation often involves the evolution of divergent ecotypes in response to differences in soil water availability between habitats. While the same set of traits is frequently associated with xeric/mesic ecotype divergence, it is unknown whether those traits evolve independently or if they evolve in tandem as a result of genetic colocalization either by pleiotropy or genetic linkage. The self-fertilizing C₄ grass species Panicum hallii includes two major ecotypes found in xeric (var. hallii) or mesic (var. filipes) habitats. We constructed the first linkage map for P. hallii by genotyping a reduced representation genomic library of an F₂ population derived from an intercross of var. hallii and filipes. We then evaluated the genetic architecture of divergence between these ecotypes through quantitative trait locus (QTL) mapping. Overall, we mapped QTLs for nine morphological traits that are involved in the divergence between the ecotypes. QTLs for five key ecotype-differentiating traits all colocalized to the same region of linkage group five. Leaf physiological traits were less divergent between ecotypes, but we still mapped five physiological QTLs. We also discovered a two-locus Dobzhansky-Muller hybrid incompatibility. Our study suggests that ecotype-differentiating traits may evolve in tandem as a result of genetic colocalization.
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  • Lowry, D. B., Hernandez, K., Taylor, S. H., Meyer, E., Logan, T. L., Barry, K. W., Chapman, J. A., Rokhsar, D. S., Schmutz, J., & Juenger, T. E. (2015). The genetics of divergence and reproductive isolation between ecotypes of Panicum hallii. New Phytologist, 205(1), 402-414. doi:10.1111/nph.13027
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  • 205
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  • 1
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  • The University of Texas Freshman Research Initiative providedfunding for training of undergraduate students that worked onthis project. The National Science Foundation provided fundingthrough a Plant Genome Research Program Award (IOS-0922457) to T.E.J. and a Postdoctoral Research Fellowship inBiology (DBI 1103668) to K.H. A United States Department ofAgriculture NIFA-AFRI Postdoctoral Fellowship (2011-67012-30696) supported D.B.L. The work conducted by the USDepartment of Energy Joint Genome Institute was supported bythe Office of Science of the US Department of Energy underContract no. DE-AC02-05CH11231.
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  • description.provenance : Submitted by Erin Clark (erin.clark@oregonstate.edu) on 2014-12-30T23:39:51Z No. of bitstreams: 2 license_rdf: 1370 bytes, checksum: cd1af5ab51bcc7a5280cf305303530e9 (MD5) MeyerEliZoologyGeneticsDivergenceReproductive.pdf: 1431677 bytes, checksum: 9188ba973251c261f72e72b6a2405542 (MD5)
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