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The genetics of divergence and reproductive isolation between ecotypes of Panicum hallii.

Lowry DB, Hernandez K, Taylor SH, Meyer E, Logan TL, Barry KW, Chapman JA, Rokhsar DS, Schmutz J, Juenger TE - New Phytol. (2014)

Bottom Line: 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.Our study suggests that ecotype-differentiating traits may evolve in tandem as a result of genetic colocalization.

View Article: PubMed Central - PubMed

Affiliation: Department of Integrative Biology and Institute for Cellular and Molecular Biology, University of Texas at Austin, 1 University Station C0990, Austin, TX, 78712, USA; Division of Science and Environmental Policy, California State University, Monterey Bay, 100 Campus Center, Seaside, CA, 93955, USA.

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A two-locus Dobzhansky–Muller hybrid sterility incompatibility system between the HAL2 and FIL2 lines of Panicum hallii. Mean genotypic effects for the homozygous HAL2 individuals (AA), homozygous FIL2 individuals (BB), and heterozygous individuals (AB) are indicated for the locus on linkage group 7 on the x-axis and by colored lines (AA, red line; BB, blue line; AB, black line) for the locus on linkage group 2 at 65 cM. A high level of sterility occurs in individuals that are homozygous for the HAL2 allele on linkage group 7 and homozygous for the FIL2 allele on linkage group 2. cM, centimorgan.
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fig05: A two-locus Dobzhansky–Muller hybrid sterility incompatibility system between the HAL2 and FIL2 lines of Panicum hallii. Mean genotypic effects for the homozygous HAL2 individuals (AA), homozygous FIL2 individuals (BB), and heterozygous individuals (AB) are indicated for the locus on linkage group 7 on the x-axis and by colored lines (AA, red line; BB, blue line; AB, black line) for the locus on linkage group 2 at 65 cM. A high level of sterility occurs in individuals that are homozygous for the HAL2 allele on linkage group 7 and homozygous for the FIL2 allele on linkage group 2. cM, centimorgan.

Mentions: Stepwise QTL model fitting revealed a significant (LOD = 17.274) pairwise epistatic interaction for hybrid sterility established by seed set (Fig.5). This pairwise interaction appears to be a classic Dobzhansky–Muller incompatibility (Coyne & Orr, 2004; Sweigart & Willis, 2012; Bomblies, 2013). Here, individual plants were sterile when homozygous for the HAL2 allele at position 83 cM on linkage group 7 and homozygous for the FIL2 allele at position 65 cM on linkage group 2.


The genetics of divergence and reproductive isolation between ecotypes of Panicum hallii.

Lowry DB, Hernandez K, Taylor SH, Meyer E, Logan TL, Barry KW, Chapman JA, Rokhsar DS, Schmutz J, Juenger TE - New Phytol. (2014)

A two-locus Dobzhansky–Muller hybrid sterility incompatibility system between the HAL2 and FIL2 lines of Panicum hallii. Mean genotypic effects for the homozygous HAL2 individuals (AA), homozygous FIL2 individuals (BB), and heterozygous individuals (AB) are indicated for the locus on linkage group 7 on the x-axis and by colored lines (AA, red line; BB, blue line; AB, black line) for the locus on linkage group 2 at 65 cM. A high level of sterility occurs in individuals that are homozygous for the HAL2 allele on linkage group 7 and homozygous for the FIL2 allele on linkage group 2. cM, centimorgan.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4265272&req=5

fig05: A two-locus Dobzhansky–Muller hybrid sterility incompatibility system between the HAL2 and FIL2 lines of Panicum hallii. Mean genotypic effects for the homozygous HAL2 individuals (AA), homozygous FIL2 individuals (BB), and heterozygous individuals (AB) are indicated for the locus on linkage group 7 on the x-axis and by colored lines (AA, red line; BB, blue line; AB, black line) for the locus on linkage group 2 at 65 cM. A high level of sterility occurs in individuals that are homozygous for the HAL2 allele on linkage group 7 and homozygous for the FIL2 allele on linkage group 2. cM, centimorgan.
Mentions: Stepwise QTL model fitting revealed a significant (LOD = 17.274) pairwise epistatic interaction for hybrid sterility established by seed set (Fig.5). This pairwise interaction appears to be a classic Dobzhansky–Muller incompatibility (Coyne & Orr, 2004; Sweigart & Willis, 2012; Bomblies, 2013). Here, individual plants were sterile when homozygous for the HAL2 allele at position 83 cM on linkage group 7 and homozygous for the FIL2 allele at position 65 cM on linkage group 2.

Bottom Line: 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.Our study suggests that ecotype-differentiating traits may evolve in tandem as a result of genetic colocalization.

View Article: PubMed Central - PubMed

Affiliation: Department of Integrative Biology and Institute for Cellular and Molecular Biology, University of Texas at Austin, 1 University Station C0990, Austin, TX, 78712, USA; Division of Science and Environmental Policy, California State University, Monterey Bay, 100 Campus Center, Seaside, CA, 93955, USA.

Show MeSH
Related in: MedlinePlus