A5001005798- Genetic diversity and population structure
- Genetic Mapping and Diversity in Plants and Animals
- Chromosomal and Genetic Variations
- Plant Molecular Biology Research
- Plant Disease Resistance and Genetics
- Genomics and Phylogenetic Studies
- Sunflower and Safflower Cultivation
- Evolution and Genetic Dynamics
- Plant Stress Responses and Tolerance
- Plant Pathogens and Resistance
- Plant Reproductive Biology
- Ecology and Vegetation Dynamics Studies
- Genetic and Environmental Crop Studies
- Plant responses to elevated CO2
- Plant Water Relations and Carbon Dynamics
- Plant and animal studies
- Species Distribution and Climate Change
- Plant Taxonomy and Phylogenetics
- Genetics, Bioinformatics, and Biomedical Research
- Plant nutrient uptake and metabolism
- Cassava research and cyanide
- Marine and coastal plant biology
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- Genetics and Plant Breeding
Kansas State University
2011-2024
Washington University in St. Louis
2008
Brown University
2004
University of Minnesota
2004
North Carolina State University
2001-2004
Indiana University Bloomington
1996-2003
A latitudinal cline in flowering time accessions of Arabidopsis thaliana has been widely predicted because the environmental cues that promote vary systematically with latitude, but evidence for such clines lacking. Here, we report a significant among 70 Northern European and Mediterranean ecotypes when grown under ecologically realistic conditions common garden environment. The detected cline, however, is found only alleles gene FRIGIDA (FRI) lack major deletions would disrupt protein...
The origin of a new diploid species by means hybridization requires the successful merger differentiated parental species' genomes. To study this process, genomic composition three experimentally synthesized hybrid lineages was compared with that an ancient species. and hybrids concordant (rs = 0.68, P < 0.0001), indicating selection to large extent governs formation. Further, nonrandom rates introgression significant associations among unlinked markers in each imply interactions between...
Hybrid or “recombinational” speciation refers to the origin of a new homoploid species via hybridization between chromosomally genetically divergent parental species. Theory predicts that this mode is punctuated, but there has been little empirical evidence support claim. Here, we test hypothesis rapid hybrid by estimating sizes chromosomal blocks in Helianthus anomalus , wild sunflower derived H. annuus and petiolaris . Analysis frequency spectrum with respect predictions based on R. A....
An understanding of how communities are organized is a fundamental goal ecology but one which has historically been elusive for microbial systems. We used bar-coded pyrosequencing approach targeting the V3 region bacterial small-subunit rRNA gene to address factors that structure along thermal gradients two alkaline hot springs in Lower Geyser Basin Yellowstone National Park. The filtered data set included total nearly 34,000 sequences from 39 environmental samples. Each was assigned 391...
• Low temperature represents a form of abiotic stress that varies predictably with latitude and altitude to which organisms have evolved multiple physiological responses. Plants provide an especially useful experimental system for investigating the ecological evolutionary dynamics tolerance low because their sessile lifestyle inability escape ambient atmospheric conditions. Here, intraspecific variation in freezing was investigated Arabidopsis thaliana by conducting assays on 71 accessions...
Abstract Molecular biologists are rapidly characterizing the genetic basis of flowering in model species such as Arabidopsis thaliana. However, it is not clear how developmental pathways identified controlled environments contribute to variation reproductive timing natural ecological settings. Here we report first study quantitative trait loci (QTL) for date bolting (the transition from vegetative growth) A. thaliana seasonal field and compare results with those obtained under typical...
Abstract Phenotypic plasticity and genotype-environment interactions (GEI) play a prominent role in plant morphological diversity the potential functional capacities of life-history traits. The genetic basis GEI, however, is poorly understood most organisms. In this report, inflorescence development patterns Arabidopsis thaliana were examined under different, ecologically relevant photoperiod environments for two recombinant inbred mapping populations (Ler × Col Cvi Ler) using combination...
Genetic variation for quantitative traits is often greater than that expected to be maintained by mutation in the face of purifying natural selection. One possible explanation this observed action heterogeneous selection wild. Here we report on trait loci (QTL) fitness model plant species Arabidopsis thaliana differs among ecological settings and genetic backgrounds. At one QTL, allele enhanced viability fall-germinating seedlings North Carolina reduced fecundity spring-germinating Rhode...
Abstract Variation in inflorescence development patterns is a central factor the evolutionary ecology of plants. The genetic architectures 13 traits associated with developmental timing, architecture, rosette morphology, and fitness were investigated Arabidopsis thaliana, model plant system. There substantial naturally occurring variation for traits, broad sense heritabilities computed from 21 ecotypes ranging 0.134 to 0.772. Genetic correlations are significant most (64/78) pairs suggesting...
Aside from polyploidy, transposable elements are the major drivers of genome size increases in plants. Thus, understanding diversity and evolutionary dynamics sunflower (Helianthus annuus L.), especially given its large (∼3.5 Gb) well-documented cases amplification certain transposons within genus, is considerable importance for history this emerging model species. By analyzing approximately 25% random sequence reads assembled bacterial artificial chromosome (BAC) clones, we show that it...
Hybridization is thought to play an important role in plant evolution by introducing novel genetic combinations and promoting genome restructuring. However, surprisingly little known about the impact of hybridization on transposable element (TE) proliferation genomic response TE activity. In this paper, we first review mechanisms which homoploid hybrid species may arise nature. We then present sunflowers as a case study examine transcriptional activity long terminal repeat retrotransposons...
Canalization is a fundamental feature of many developmental systems, yet the genetic basis for this property remains elusive. We examine microenvironmental canalization in model plant Arabidopsis thaliana, focusing on differential stability between genotypes one fitness and four quantitative morphological traits. measured genetically identical replicates two populations recombinant inbred (RI) lines population geographically widespread accessions A. thaliana grown different...
In plants, ecologically important life history traits often display clinal patterns of population divergence. Such can provide strong evidence for spatially varying selection across environmental gradients but also may result from nonselective processes, such as genetic drift, bottlenecks and restricted gene flow. Comparison differentiation in quantitative (measured Q(ST) ) with neutral molecular markers F(ST) provides a useful tool understanding the relative importance adaptive nonadaptive...
Summary Flowering plants serve as a powerful model for studying the evolution of nuclear genome size (GS) given tremendous GS variation that exists both within and across angiosperm lineages. Helianthus sunflowers consist c . 50 species native to North America occupy diverse habitats vary in ploidy level. In current study, we generated comprehensive database 49 using flow cytometric approaches. We examined variability genus present comparative phylogenetic analysis diploid species. Results...
Elucidating the molecular basis of adaptive phenotypic variation represents a central aim in evolutionary biology. Traits exhibiting patterns clinal represent excellent models for studies adaptation, especially when phenotype can be linked to organismal fitness different environments. Natural accessions model plant species Arabidopsis thaliana exhibit freezing tolerance that follows gradient temperature variability across species' native range (Zhen Y, Ungerer MC. 2008. Clinal among natural...
Long terminal repeat (LTR) retrotransposons are a class of mobile genetic element capable autonomous transposition via an RNA intermediate. Their large size and proliferative ability make them important contributors to genome evolution, especially in plants, where they can reach exceptionally high copy numbers contribute substantially variation even among closely related taxa. Using phylogenetic approach, we characterize dynamics proliferation events Ty3/gypsy-like LTR that led massive...
Hybridization is a natural phenomenon that has been linked in several organismal groups to transposable element derepression and copy number amplification. A noteworthy example involves three diploid annual sunflower species from North America have arisen via ancient hybridization between the same two parental taxa, Helianthus annuus H. petiolaris. The genomes of hybrid undergone large-scale increases genome size attributable long terminal repeat (LTR) retrotransposon proliferation. gave...
Abstract This article documents the addition of 228 microsatellite marker loci to Molecular Ecology Resources Database. Loci were developed for following species: Anser cygnoides, Apodemus flavicollis, Athene noctua, Cercis canadensis, Glis glis, Gubernatrix cristata, Haliotis tuberculata, Helianthus maximiliani, Laricobius nigrinus, rubidus, Neoheligmonella granjoni, Nephrops norvegicus, Oenanthe javanica, Paramuricea clavata, Pyrrhura orcesi and Samanea saman. These cross‐tested on...
Abstract When resources are limited, there is a trade-off between growth/reproduction and stress defense in plants. Most temperate plant species, including Arabidopsis thaliana, can enhance freezing tolerance through cold acclimation at low but nonfreezing temperatures. Induction of the pathway should be beneficial environments where plants frequently encounter stress, it might represent cost events rare. In A. induction critically involves small subfamily genes known as CBFs. Here we test...
Premise of research. Snow algae are cosmopolitan and often colonize late-season snowpacks. These snow do not occur in isolation; rather, visible algal blooms consist multispecies communities. Although several these common have been characterized taxonomically, their inter- intraspecific diversity remains unknown. Further, the phylogeographic biogeographic structuring species is poorly understood.Methodology. Algal communities were censused by sequencing variable internal transcribed spacer 2...