NDLI: The genetics of divergence and reproductive isolation between ecotypes of Panicum hallii

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	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.
Description	Country affiliation: United States Author Affiliation: Lowry DB ( Department of Integrative Biology and Institute for Cellular and Molecular Biology, University of Texas at Austin, 1 University Station C0990, Austin, TX, 78712, USA)
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.
File Format	HTM / HTML
ISSN	0028646X
e-ISSN	14698137
DOI	10.1111/nph.13027
Journal	New Phytologist
Issue Number	1
Volume Number	205
Language	English
Publisher	Wiley
Publisher Date	2015-01-01
Publisher Place	Great Britain (UK)
Access Restriction	Open
Subject Keyword	Discipline Botany Ecotype Genetic Variation Panicum Genetics Reproductive Isolation Chromosome Mapping Crosses, Genetic Genetic Markers Genetics, Population Hybridization, Genetic Phenotype Physiology Quantitative Trait Loci Quantitative Trait, Heritable Synteny Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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