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Insights Into The Evolution Of Cotton Diploids And Polyploids From Whole-Genome Re-Sequencing, Justin T. Page, Mark D. Huynh, Zach S. Liechty, Kara Grupp, David M. Stelly, Amanda M. Hulse, Hamid Ashrafi, Allen Van Deynze, Jonathan F. Wendel, Joshua A. Udall Oct 2013

Insights Into The Evolution Of Cotton Diploids And Polyploids From Whole-Genome Re-Sequencing, Justin T. Page, Mark D. Huynh, Zach S. Liechty, Kara Grupp, David M. Stelly, Amanda M. Hulse, Hamid Ashrafi, Allen Van Deynze, Jonathan F. Wendel, Joshua A. Udall

Ecology, Evolution and Organismal Biology Publications

Understanding the composition, evolution, and function of the Gossypium hirsutum (cotton) genome is complicated by the joint presence of two genomes in its nucleus (AT and DT genomes). These two genomes were derived from progenitor A-genome and D-genome diploids involved in ancestral allopolyploidization. To better understand the allopolyploid genome, we re-sequenced the genomes of extant diploid relatives that contain the A1 (Gossypium herbaceum), A2 (Gossypium arboreum), or D5 (Gossypium raimondii) genomes. We conducted a comparative analysis using deep re-sequencing of multiple accessions of each diploid species and identified 24 million SNPs between the A-diploid and D-diploid genomes. These analyses facilitated ...


Crop Plants As Models For Understanding Plant Adaptation And Diversification, Kenneth M. Olsen, Jonathan F. Wendel Aug 2013

Crop Plants As Models For Understanding Plant Adaptation And Diversification, Kenneth M. Olsen, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

Since the time of Darwin, biologists have understood the promise of crop plants and their wild relatives for providing insight into the mechanisms of phenotypic evolution. The intense selection imposed by our ancestors during plant domestication and subsequent crop improvement has generated remarkable transformations of plant phenotypes. Unlike evolution in natural settings, descendent and antecedent conditions for crop plants are often both extant, providing opportunities for direct comparisons through crossing and other experimental approaches. Moreover, since domestication has repeatedly generated a suite of "domestication syndrome" traits that are shared among crops, opportunities exist for gaining insight into the genetic and ...


Biodiversity Simultaneously Enhances The Production And Stability Of Community Biomass, But The Effects Are Iindependent, Bradley Cardinale, Kevin Gross, Keith Fritschie, Pedro Flombaum, Jeremy W. Fox, Christian Rixen, Jasper Van Ruijven, Peter B. Reich, Michael Scherer-Lorenzen, Brian J. Wilsey Aug 2013

Biodiversity Simultaneously Enhances The Production And Stability Of Community Biomass, But The Effects Are Iindependent, Bradley Cardinale, Kevin Gross, Keith Fritschie, Pedro Flombaum, Jeremy W. Fox, Christian Rixen, Jasper Van Ruijven, Peter B. Reich, Michael Scherer-Lorenzen, Brian J. Wilsey

Ecology, Evolution and Organismal Biology Publications

To predict the ecological consequences of biodiversity loss, researchers have spent much time and effort quantifying how biological variation affects the magnitude and stability of ecological processes that underlie the functioning of ecosystems. Here we add to this work by looking at how biodiversity jointly impacts two aspects of ecosystem functioning at once: (1) the production of biomass at any single point in time (biomass/area or biomass/volume), and (2) the stability of biomass production through time (the CV of changes in total community biomass through time). While it is often assumed that biodiversity simultaneously enhances both of these ...


Life-History Constraints In Grassland Plant Species: A Growth-Defence Trade-Off Is The Norm, Eric M. Lind, Elizabeth T. Borer, Eric W. Seabloom, Peter B. Adler, Jonathan D. Bakker, Dana M. Blumenthal, Michael J. Crawley, Kendi F. Davies, Jennifer Firn, Daniel S. Gruner, W. Stanley Harpole, Yann Hautier, Helmut Hillebrand, Johannes M. H. Knops, Brett A. Melbourne, Brent D. Mortensen, Anita C. Risch, Martin Schuetz, Carly J. Stevens, Peter D. Wragg Apr 2013

Life-History Constraints In Grassland Plant Species: A Growth-Defence Trade-Off Is The Norm, Eric M. Lind, Elizabeth T. Borer, Eric W. Seabloom, Peter B. Adler, Jonathan D. Bakker, Dana M. Blumenthal, Michael J. Crawley, Kendi F. Davies, Jennifer Firn, Daniel S. Gruner, W. Stanley Harpole, Yann Hautier, Helmut Hillebrand, Johannes M. H. Knops, Brett A. Melbourne, Brent D. Mortensen, Anita C. Risch, Martin Schuetz, Carly J. Stevens, Peter D. Wragg

Ecology, Evolution and Organismal Biology Publications

Plant growth can be limited by resource acquisition and defence against consumers, leading to contrasting trade-off possibilities. The competition-defence hypothesis posits a trade-off between competitive ability and defence against enemies (e.g. herbivores and pathogens). The growth-defence hypothesis suggests that strong competitors for nutrients are also defended against enemies, at a cost to growth rate. We tested these hypotheses using observations of 706 plant populations of over 500 species before and following identical fertilisation and fencing treatments at 39 grassland sites worldwide. Strong positive covariance in species responses to both treatments provided support for a growth-defence trade-off: populations that increased ...


Composition And Expression Of Conserved Microrna Genes In Diploid Cotton (Gossypium) Species, Lei Gong, Atul Kakrana, Siwaret Arikit, Blake C. Meyers, Jonathan F. Wendel Jan 2013

Composition And Expression Of Conserved Microrna Genes In Diploid Cotton (Gossypium) Species, Lei Gong, Atul Kakrana, Siwaret Arikit, Blake C. Meyers, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

MicroRNAs are ubiquitous in plant genomes but vary greatly in their abundance within and conservation among plant lineages. To gain insight into the evolutionary birth/death dynamics of microRNA families, we sequenced small RNA and 50-end PARE libraries generated from two closely related species of Gossypium. Here, we demonstrate that 33 microRNA families, with similar copy numbers and average evolutionary rates, are conserved in the two congeneric cottons. Analysis of the presence/absence of these microRNA families in other land plants sheds light on their depth of phylogenetic origin and lineage-specific loss/gain. Conserved microRNA families in Gossypium exhibit a ...