The genetics of divergence and reproductive isolation between ecotypes of Panicum hallii
Abstract
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.
- Authors:
-
- Univ. of Texas, Austin, TX (United States); California State Univ. (CalState), Seaside, CA (United States); Michigan State Univ., East Lansing, MI (United States). Plant Biology Lab.
- Univ. of Texas, Austin, TX (United States); Univ. of Chicago, IL (United States). Center for Research Informatics
- Univ. of Texas, Austin, TX (United States); Bowdoin College, Brunswick, ME (United States)
- Univ. of Texas, Austin, TX (United States); Oregon State Univ., Corvallis, OR (United States)
- Univ. of Texas, Austin, TX (United States)
- USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States)
- USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States); Univ. of California, Berkeley, CA (United States). Center for Integrative Genomics
- USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States); HudsonAlpha Genome Sequencing Center, Huntsville AL (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1615257
- Grant/Contract Number:
- AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- New Phytologist
- Additional Journal Information:
- Journal Volume: 205; Journal Issue: 1; Journal ID: ISSN 0028-646X
- Publisher:
- Wiley
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; adaptation; drought; ecotype; physiology; pleiotropy; quantitative trait locus (QTL); reproductive isolation
Citation Formats
Lowry, David B., Hernandez, Kyle, Taylor, Samuel H., Meyer, Eli, Logan, Tierney L., Barry, Kerrie W., Chapman, Jarrod A., Rokhsar, Daniel S., Schmutz, Jeremy, and Juenger, Thomas E. The genetics of divergence and reproductive isolation between ecotypes of Panicum hallii. United States: N. p., 2014.
Web. doi:10.1111/nph.13027.
Lowry, David B., Hernandez, Kyle, Taylor, Samuel H., Meyer, Eli, Logan, Tierney L., Barry, Kerrie W., Chapman, Jarrod A., Rokhsar, Daniel S., Schmutz, Jeremy, & Juenger, Thomas E. The genetics of divergence and reproductive isolation between ecotypes of Panicum hallii. United States. https://doi.org/10.1111/nph.13027
Lowry, David B., Hernandez, Kyle, Taylor, Samuel H., Meyer, Eli, Logan, Tierney L., Barry, Kerrie W., Chapman, Jarrod A., Rokhsar, Daniel S., Schmutz, Jeremy, and Juenger, Thomas E. Tue .
"The genetics of divergence and reproductive isolation between ecotypes of Panicum hallii". United States. https://doi.org/10.1111/nph.13027. https://www.osti.gov/servlets/purl/1615257.
@article{osti_1615257,
title = {The genetics of divergence and reproductive isolation between ecotypes of Panicum hallii},
author = {Lowry, David B. and Hernandez, Kyle and Taylor, Samuel H. and Meyer, Eli and Logan, Tierney L. and Barry, Kerrie W. and Chapman, Jarrod A. and Rokhsar, Daniel S. and Schmutz, Jeremy and Juenger, Thomas E.},
abstractNote = {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.},
doi = {10.1111/nph.13027},
journal = {New Phytologist},
number = 1,
volume = 205,
place = {United States},
year = {Tue Sep 23 00:00:00 EDT 2014},
month = {Tue Sep 23 00:00:00 EDT 2014}
}
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Figures / Tables:
Table 1: Means (SE) morphological trait values for FIL2, HAL2 and F2 Panicum hallii plants
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