Uniform Selection as a Primary Force Reducing Population Genetic Differentiation of Cavitation Resistance across a Species Range
| Type | Article | ||||||||
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| Date | 2011-08 | ||||||||
| Language | English | ||||||||
| Author(s) | Lamy Jean-Baptiste 1, 2, 3, Bouffier Laurent1, 4, Burlett Regis1, 2, Plomion Christophe1, 2, Cochard Herve3, Delzon Sylvain1, 2 |
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| Affiliation(s) | 1 : INRA, UMR BIOGECO 1202, F-33610 Cestas, France. 2 : Univ Bordeaux, UMR BIOGECO 1202, F-33610 Cestas, France. 3 : Univ Clermont Ferrand, INRA, UMR PIAF 547, F-63100 Clermont Ferrand, France. 4 : FCBA, Stn Sud Ouest, Domaine Sivaillan, F-33480 Moulis En Medoc, France. |
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| Source | Plos One (1932-6203) (Public Library Science), 2011-08 , Vol. 6 , N. 8 , P. e23476 | ||||||||
| DOI | 10.1371/journal.pone.0023476 | ||||||||
| WOS© Times Cited | 118 | ||||||||
| Abstract | Background: Cavitation resistance to water stress-induced embolism determines plant survival during drought. This adaptive trait has been described as highly variable in a wide range of tree species, but little is known about the extent of genetic and phenotypic variability within species. This information is essential to our understanding of the evolutionary forces that have shaped this trait, and for evaluation of its inclusion in breeding programs. Methodology: We assessed cavitation resistance (P(50)), growth and carbon isotope composition in six Pinus pinaster populations in a provenance and progeny trial. We estimated the heritability of cavitation resistance and compared the distribution of neutral markers (F(ST)) and quantitative genetic differentiation (Q(ST)), for retrospective identification of the evolutionary forces acting on these traits. Results/Discussion: In contrast to growth and carbon isotope composition, no population differentiation was found for cavitation resistance. Heritability was higher than for the other traits, with a low additive genetic variance (h(ns)(2) = 0.43+/-0.18, CV(A) = 4.4%). Q(ST) was significantly lower than F(ST), indicating uniform selection for P(50), rather than genetic drift. Putative mechanisms underlying Q(ST) | ||||||||
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