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Cenh3 Evolution In Diploids And Polyploids Of Three Angiosperm Genera, Rick E. Masonbrink, Joseph P. Gallagher, Josef J. Jareczek, Simon Renny-Byfield, Corrinne E. Grover, Lei Gong, Jonathan F. Wendel Dec 2014

Cenh3 Evolution In Diploids And Polyploids Of Three Angiosperm Genera, Rick E. Masonbrink, Joseph P. Gallagher, Josef J. Jareczek, Simon Renny-Byfield, Corrinne E. Grover, Lei Gong, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

Centromeric DNA sequences alone are neither necessary nor sufficient for centromere specification. The centromere specific histone, CenH3, evolves rapidly in many species, perhaps as a coevolutionary response to rapidly evolving centromeric DNA. To gain insight into CenH3 evolution, we characterized patterns of nucleotide and protein diversity among diploids and allopolyploids within three diverse angiosperm genera, Brassica, Oryza, and Gossypium (cotton), with a focus on evidence for diversifying selection in the various domains of the CenH3 gene. In addition, we compare expression profiles and alternative splicing patterns for CenH3 in representatives of each genus. All three genera retain both duplicated CenH3 ...


Fire Induced Reproductive Mechanisms Of A Symphoricarpos (Caprifoliaceae) Shrub After Dormant Season Burning, John Derek Scasta, David M. Engle, Ryan N. Harr, Diane M. Debinski Dec 2014

Fire Induced Reproductive Mechanisms Of A Symphoricarpos (Caprifoliaceae) Shrub After Dormant Season Burning, John Derek Scasta, David M. Engle, Ryan N. Harr, Diane M. Debinski

Ecology, Evolution and Organismal Biology Publications

Background: Symphoricarpos, a genus of the Caprifoliaceae family, consists of about 15 species of clonal deciduous shrubs in North America and 1 species endemic to China. In North American tallgrass prairie, Symphoricarpos orbiculatus (buckbrush) is the dominant shrub often forming large colonies via sexual and asexual reproductive mechanisms. Symphoricarpos shrubs, in particular S. orbiculatus, use a unique sexual reproductive mechanism known as layering where vertical stems droop and the tips root upon contact with the soil. Because of conflicting societal values of S. orbiculatus for conservation and agriculture and the current attempt to restore historical fire regimes, there is a ...


Control Of Cotton Fibre Elongation By A Homeodomain Transcription Factor Ghhox3, Chun-Min Shan, Ziao-Xia Shangguan, Bo Zhao, Xiu-Fang Zhang, Lu-Men Chao, Chang-Qing Yang, Ling-Jian Wang, Hua-Yu Zhu, Yan-Da Zeng, Wang-Zhen Guo, Bao-Liang Zhou, Guanjing Hu, Xue-Ying Guan, Z. Jeffrey Chen, Jonathan F. Wendel, Tian-Zhen Zhang, Xiao-Ya Chen Nov 2014

Control Of Cotton Fibre Elongation By A Homeodomain Transcription Factor Ghhox3, Chun-Min Shan, Ziao-Xia Shangguan, Bo Zhao, Xiu-Fang Zhang, Lu-Men Chao, Chang-Qing Yang, Ling-Jian Wang, Hua-Yu Zhu, Yan-Da Zeng, Wang-Zhen Guo, Bao-Liang Zhou, Guanjing Hu, Xue-Ying Guan, Z. Jeffrey Chen, Jonathan F. Wendel, Tian-Zhen Zhang, Xiao-Ya Chen

Ecology, Evolution and Organismal Biology Publications

Cotton fibres are unusually long, single-celled epidermal seed trichomes and a model for plant cell growth, but little is known about the regulation of fibre cell elongation. Here we report that a homeodomain-leucine zipper (HD-ZIP) transcription factor, GhHOX3, controls cotton fibre elongation. GhHOX3 genes are localized to the 12th homoeologous chromosome set of allotetraploid cotton cultivars, associated with quantitative trait loci (QTLs) for fibre length. Silencing of GhHOX3 greatly reduces (>80%) fibre length, whereas its overexpression leads to longer fibre. Combined transcriptomic and biochemical analyses identify target genes of GhHOX3 that also contain the L1-box cis-element, including two cell ...


Ancient Gene Duplicates In Gossypium (Cotton) Exhibit Near-Complete Expression Divergence, Simon Renny-Byfield, Joseph P. Gallagher, Corrinne E. Grover, Emmanuel Szadkowski, Justin T. Page, Joshua A. Udall, Xiyin Wang, Andrew H. Paterson, Jonathan F. Wendel Apr 2014

Ancient Gene Duplicates In Gossypium (Cotton) Exhibit Near-Complete Expression Divergence, Simon Renny-Byfield, Joseph P. Gallagher, Corrinne E. Grover, Emmanuel Szadkowski, Justin T. Page, Joshua A. Udall, Xiyin Wang, Andrew H. Paterson, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

Whole genome duplication (WGD) is widespread in flowering plants and is a driving force in angiosperm diversification. The redundancy introduced by WGD allows the evolution of novel gene interactions and functions, although the patterns and processes of diversification are poorly understood. We identified ∼ 2,000 pairs of paralogous genes in Gossypium raimondii (cotton) resulting from an approximately 60 My old 5- to 6-fold ploidy increase. Gene expression analyses revealed that, in G. raimondii, 99.4% of the gene pairs exhibit differential expression in at least one of the three tissues (petal, leaf, and seed), with 93% to 94% exhibiting differential ...


Impacts Of Climate Change Drivers On C4 Grassland Productivity: Scaling Driver Effects Through The Plant Community, H. Wayne Polley, Justin D. Derner, Robert B. Jackson, Brian J. Wilsey, Philip A. Fay Jan 2014

Impacts Of Climate Change Drivers On C4 Grassland Productivity: Scaling Driver Effects Through The Plant Community, H. Wayne Polley, Justin D. Derner, Robert B. Jackson, Brian J. Wilsey, Philip A. Fay

Ecology, Evolution and Organismal Biology Publications

Climate change drivers affect plant community productivity via three pathways: (i) direct effects of drivers on plants; (ii) the response of species abundances to drivers (community response); and (iii) the feedback effect of community change on productivity (community effect). The contribution of each pathway to driver–productivity relationships depends on functional traits of dominant species. We used data from three experiments in Texas, USA, to assess the role of community dynamics in the aboveground net primary productivity (ANPP) response of C4 grasslands to two climate drivers applied singly: atmospheric CO2 enrichment and augmented summer precipitation. The ANPPdriver response differed among ...


Comparative Evolutionary And Developmental Dynamics Of The Cotton (Gossypium Hirsutum) Fiber Transcriptome, Mi-Jeong Yoo, Jonathan F. Wendel Jan 2014

Comparative Evolutionary And Developmental Dynamics Of The Cotton (Gossypium Hirsutum) Fiber Transcriptome, Mi-Jeong Yoo, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

The single-celled cotton (Gossypium hirsutum) fiber provides an excellent model to investigate how human selection affects phenotypic evolution. To gain insight into the evolutionary genomics of cotton domestication, we conducted comparative transcriptome profiling of developing cotton fibers using RNA-Seq. Analysis of single-celled fiber transcriptomes from four wild and five domesticated accessions from two developmental time points revealed that at least one-third and likely onehalf of the genes in the genome are expressed at any one stage during cotton fiber development. Among these, ,5,000 genes are differentially expressed during primary and secondary cell wall synthesis between wild and domesticated cottons ...


Lymantria Dispar Iflavirus 1 (Ldiv1), A New Model To Study Iflaviral Persistence In Lepidopterans, Jimena Carrillo-Tripp, Elizabeth N. Krueger, Robert L. Harrison, Amy L. Toth, W. Allen Miller, Bryony C. Bonning Jan 2014

Lymantria Dispar Iflavirus 1 (Ldiv1), A New Model To Study Iflaviral Persistence In Lepidopterans, Jimena Carrillo-Tripp, Elizabeth N. Krueger, Robert L. Harrison, Amy L. Toth, W. Allen Miller, Bryony C. Bonning

Ecology, Evolution and Organismal Biology Publications

The cell line IPLB-LD-652Y, derived from the gypsy moth (Lymantria dispar L.), is routinely used to study interactions between viruses and insect hosts. Here we report the full genome sequence and biological characteristics of a small RNA virus, designated Lymantria dispar iflavirus 1 (LdIV1), that was discovered to persistently infect IPLB-LD-652Y. LdIV1 belongs to the genus Iflavirus. LdIV1 formed icosahedral particles of approx. 30 nm in diameter and contained a 10 044 nt polyadenylated, positive-sense RNA genome encoding a predicted polyprotein of 2980 aa. LdIV1 was induced by a viral suppressor of RNA silencing, suggesting that acute infection is restricted ...


Invaded Grassland Communities Have Altered Stability-Maintenance Mechanisms But Equal Stability Compared To Native Communities, Brian J. Wilsey, Pedram P. Daneshgar, Kirsten S. Hofmockel, H. Wayne Polley Jan 2014

Invaded Grassland Communities Have Altered Stability-Maintenance Mechanisms But Equal Stability Compared To Native Communities, Brian J. Wilsey, Pedram P. Daneshgar, Kirsten S. Hofmockel, H. Wayne Polley

Ecology, Evolution and Organismal Biology Publications

Theory predicts that stability should increase with diversity via several mechanisms. We tested predictions in a 5-year experiment that compared low-diversity exotic to high-diversity native plant mixtures under two irrigation treatments. The study included both wet and dry years. Variation in biomass across years (CV) was 50% lower in mixtures than monocultures of both native and exotic species. Growth among species was more asynchronous and overyielding values were greater during and after a drought in native than exotic mixtures. Mean-variance slopes indicated strong portfolio effects in both community types, but the intercept was higher for exotics than for natives, suggesting ...