Recent Submissions

  • Identifying loci under selection across contrasting environments in Avena barbata using quantitative trait locus mapping 

    Gardner, KM, and RG Latta. 2006. "Identifying loci under selection across contrasting environments in Avena barbata using quantitative trait locus mapping." Molecular Ecology 15(5): 1321-1333.
    We constructed recombinant inbred lines of a cross between naturally occurring ecotypes of Avena barbata (Pott ex Link), Poaceae, associated with contrasting moisture environments. These lines were assessed for fitness in ...
  • Fitness consequences of hybridization between ecotypes of Avena barbata: Hybrid breakdown, hybrid vigor, and transgressive segregation 

    Johansen-Morris, A. D., and R. G. Latta. 2006. "Fitness consequences of hybridization between ecotypes of Avena barbata: Hybrid breakdown, hybrid vigor, and transgressive segregation." Evolution 60(8): 1585-1595.
    Hybridization is an important factor in the evolution of plants; however, many of the studies that have examined hybrid fitness have been concerned with the study of early generation hybrids. We examined the early- and ...
  • Impact of Ice Ages on the genetic structure of trees and shrubs 

    Lascoux, M., AE Palme, R. Cheddadi, and RG Latta. 2004. "Impact of Ice Ages on the genetic structure of trees and shrubs." Philosophical Transactions of the Royal Society of London Series B-Biological Sciences 359(1442): 197-207.
    Data on the genetic structure of tree and shrub populations on the continental scale have accumulated dramatically over the past decade. However, our ability to make inferences on the impact of the last ice age still depends ...
  • Mitochondrial haplotype distribution, seed dispersal and patterns of postglacial expansion of ponderosa pine 

    Johansen, AD, and RG Latta. 2003. "Mitochondrial haplotype distribution, seed dispersal and patterns of postglacial expansion of ponderosa pine." Molecular ecology 12(1): 293-298.
    Maternally inherited mtDNA in a secondary contact zone of ponderosa pine revealed a cline less than 10 km wide - much narrower than previously described. A survey of 76 populations gave no evidence either of intermixing ...
  • Water Stress Alters the Genetic Architecture of Functional Traits Associated with Drought Adaptation in Avena Barbata 

    Sherrard, Mark E., Hafiz Maherali, and Robert G. Latta. 2009. "Water Stress Alters the Genetic Architecture of Functional Traits Associated with Drought Adaptation in Avena Barbata." Evolution 63(3): 702-715.
    Environmental stress can alter genetic variation and covariation underlying functional traits, and thus affect adaptive evolution in response to natural selection. However, the genetic basis of functional traits is rarely ...
  • Path analysis of natural selection via survival and fecundity across contrasting environments in Avena barbata 

    Latta, R. G., and C. McCain. 2009. "Path analysis of natural selection via survival and fecundity across contrasting environments in Avena barbata." Journal of Evolutionary Biology 22(12): 2458-2469.
    We employed path analysis to analyse natural selection through two major fitness components in each of three contrasting environments. Using a randomized block design, 188 Recombinant Inbred Lines (RILs) derived from a ...
  • Shared quantitative trait loci underlying the genetic correlation between continuous traits 

    Gardner, Kyle M., and Robert G. Latta. 2007. "Shared quantitative trait loci underlying the genetic correlation between continuous traits." Molecular ecology 16(20): 4195-4209.
    We review genetic correlations among quantitative traits in light of their underlying quantitative trait loci (QTL). We derive an expectation of genetic correlation from the effects of underlying loci and test whether ...
  • Genotype by environment interactions for fitness in hybrid genotypes of Avena barbata 

    Johansen-Morris, April D., and Robert G. Latta. 2008. "Genotype by environment interactions for fitness in hybrid genotypes of Avena barbata." Evolution 62(3): 573-585.
    We examined genotype (G) by environment (E) interactions for fitness in mesic and xeric ecotypes of the self-fertilizing annual grass, Avena barbata and their recombinant inbred hybrid progeny. Fitness was assayed (1) in ...
  • Adaptive Value and Costs of Physiological Plasticity to Soil Moisture Limitation in Recombinant Inbred Lines of Avena barbata 

    Maherali, Hafiz, Christina M. Caruso, Mark E. Sherrard, and Robert G. Latta. 2010. "Adaptive Value and Costs of Physiological Plasticity to Soil Moisture Limitation in Recombinant Inbred Lines of Avena barbata." American Naturalist 175(2): 211-224.
    Costs are hypothesized to constrain the evolution of adaptive phenotypic plasticity, but they have been difficult to quantify because strong selection should eliminate costly genotypes from natural populations. However, ...
  • Conservation genetics as applied evolution: from genetic pattern to evolutionary process 

    Latta, Robert G.. 2008. "Conservation genetics as applied evolution: from genetic pattern to evolutionary process." Evolutionary Applications 1(1): 84-94.
    Conservation genetics can be seen as the effort to influence the evolutionary process in ways that enhance the persistence of populations. Much published research in the field applies genetic sampling techniques to infer ...
  • Heritable variation and genetic correlation of quantitative traits within and between ecotypes of Avena barbata 

    Gardner, K. M., and R. G. Latta. 2008. "Heritable variation and genetic correlation of quantitative traits within and between ecotypes of Avena barbata." Journal of Evolutionary Biology 21(3): 737-748.
    We examined heritable variation for quantitative traits within and between naturally occurring mesic and xeric ecotypes of the slender wild oat (Avena barbata), and in 188 recombinant inbred lines derived from a cross ...
  • Glacial refugia of limber pine (Pinus flexilis James) inferred from the population structure of mitochondrial DNA 

    Mitton, JB, BR Kreiser, and RG Latta. 2000. "Glacial refugia of limber pine (Pinus flexilis James) inferred from the population structure of mitochondrial DNA." Molecular ecology 9(1): 91-97.
    To make inferences about the glacial refugia that harboured the limber pine, Pinus flexilis James, we examined the range-wide population structure of mitochondrial DNA (mtDNA) with eight size variants in the second intron ...
  • Adaptive population divergence: markers, QTL and traits 

    McKay, JK, and RG Latta. 2002. "Adaptive population divergence: markers, QTL and traits." Trends in Ecology & Evolution 17(6): 285-291.
    Molecular markers appear to be poor indicators of heritable variation in adaptive traits. Direct comparison of population structure in markers with that in traits is made possible by the measure Q(st), which partitions ...
  • Hybridization, recombination, and the genetic basis of fitness variation across environments in Avena barbata 

    Latta, Robert G., Kyle M. Gardner, and April D. Johansen-Morris. 2007. "Hybridization, recombination, and the genetic basis of fitness variation across environments in Avena barbata." Genetica 129(2): 167-177.
    We created Recombinant Inbred Lines (RILs) derived from a cross between ecotypes of Avena barbata associated with moist (mesic) and dry (xeric) habitats in California. Traits which were correlated with fitness across RILs ...
  • Quantitative Trait Locus Mapping of Genes Under Selection Across Multiple Years and Sites in Avena barbata: Epistasis, Pleiotropy, and Genotype-by-Environment Interactions 

    Latta, Robert G., Kyle M. Gardner, and David A. Staples. 2010. "Quantitative Trait Locus Mapping of Genes Under Selection Across Multiple Years and Sites in Avena barbata: Epistasis, Pleiotropy, and Genotype-by-Environment Interactions." Genetics 185(1): 375-385.
    The genetic architecture of variation in evolutionary fitness determines the trajectory of adaptive change. We identified quantitative trait loci (QTL) affecting fitness in a mapping population of recombinant inbred lines ...
  • Leaf hydraulic conductivity and photosynthesis are genetically correlated in an annual grass 

    Maherali, Hafiz, Mark E. Sherrard, Megan H. Clifford, and Robert G. Latta. 2008. "Leaf hydraulic conductivity and photosynthesis are genetically correlated in an annual grass." New Phytologist 180(1): 240-247.
    Comparative studies suggest that a positive correlation between xylem water transport and photosynthesis is adaptive. A requirement for the adaptive evolution of coordination between xylem and photosynthetic functions is ...
  • Natural Selection, Variation, Adaptation, and Evolution: a Primer of Interrelated Concepts 

    Latta, Robert G.. 2010. "Natural Selection, Variation, Adaptation, and Evolution: a Primer of Interrelated Concepts." International journal of plant sciences 171(9): 930-944.
    Natural selection is an elegantly simple concept but one that can manifest in complex ways. I review how the basic model of single-trait viability selection has been extended to more complex forms of selection on multiple ...
  • Natural Selection on Pleiotropic Quantitative Trait Loci Affecting a Life-History Trade-Off in Avena Barbata 

    Latta, Robert G., and Kyle M. Gardner. 2009. "Natural Selection on Pleiotropic Quantitative Trait Loci Affecting a Life-History Trade-Off in Avena Barbata." Evolution 63(8): 2153-2163.
    We applied QTL mapping to fitness variation of Avena barbata under well-watered greenhouse conditions. One hundred eighty recombinant inbred lines were assayed for flowering time, total size, mass allocation, and fitness. ...
  • Testing for local adaptation in Avena barbata: a classic example of ecotypic divergence 

    Latta, Robert G.. 2009. "Testing for local adaptation in Avena barbata: a classic example of ecotypic divergence." Molecular ecology 18(18): 3781-3791.
    Forty years ago, Robert Allard and colleagues documented that the slender wild oat, Avena barbata, occurred in California as two multi-locus allozyme genotypes, associated with mesic and xeric habitats. This is arguably ...
  • Integrating patterns across multiple genetic markers to infer spatial processes 

    Latta, Robert G.. 2006. "Integrating patterns across multiple genetic markers to infer spatial processes." Landscape Ecology 21(6): 809-820.
    Landscape geneticists can take considerable advantage of differences in the action of evolutionary forces (mutation, migration, selection, and drift) on different loci within the genome. Appropriate comparisons among loci ...

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