Jan 29, 2016

The genetic architecture of local adaptation II: The QTL landscape of water-use efficiency for foxtail pine (Pinus balfouriana Grev. & Balf.)

BioRxiv : the Preprint Server for Biology
Andrew J EckertChristopher J. Friedline

Abstract

Water availability is an important driver of the geographic distribution of many plant species, although its importance relative to other climatic variables varies across climate regimes and species. A common indirect measure of water-use efficiency (WUE) is the ratio of carbon isotopes (δ13C) fixed during photosynthesis, especially when analyzed in conjunction with a measure of leaf-level resource utilization (δ15N). Here, we test two hypotheses about the genetic architecture of WUE for foxtail pine (Pinus balfouriana Grev. & Balf.) using a novel mixture of double digest restriction site associated DNA sequencing, species distribution modeling, and quantitative genetics. First, we test the hypothesis that water availability is an important determinant of the geographical range of foxtail pine. Second, we test the hypothesis that variation in δ13C and δ15N is genetically based, differentiated between regional populations, and has genetic architectures that include loci of large effect. We show that precipitation-related variables structured the geographical range of foxtail pine, climate-based niches differed between regional populations, and δ13C and δ15N were heritable with moderate signals of differentiation between regional...Continue Reading

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Mentioned in this Paper

Biological Markers
Patterns
Restriction Site
Genetic Pleiotropy
Pinus balfouriana
Cell Differentiation Process
Site
Adaptation
Sequence Determinations, DNA
Bronchoalveolar Lavage Fluid

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