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Iowa State University

Plant Sciences

Ecology, Evolution and Organismal Biology Publications

Speciation

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The Genome Sequence Of Gossypioides Kirkii Illustrates A Descending Dysploidy In Plants, Joshua A. Udall, Evan Long, Thiruvarangan Ramaraj, Justin L. Conover, Daojun Yuan, Corrinne E. Grover, Lei Gong, Mark A. Arick Ii, Rick E. Masonbrink, Daniel G. Peterson, Jonathan F. Wendel Nov 2019

The Genome Sequence Of Gossypioides Kirkii Illustrates A Descending Dysploidy In Plants, Joshua A. Udall, Evan Long, Thiruvarangan Ramaraj, Justin L. Conover, Daojun Yuan, Corrinne E. Grover, Lei Gong, Mark A. Arick Ii, Rick E. Masonbrink, Daniel G. Peterson, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

One of the extraordinary aspects of plant genome evolution is variation in chromosome number, particularly that among closely related species. This is exemplified by the cotton genus (Gossypium) and its relatives, where most species and genera have a base chromosome number of 13. The two exceptions are sister genera that have n = 12 (the Hawaiian Kokia and the East African and Madagascan Gossypioides). We generated a high-quality genome sequence of Gossypioides kirkii (n = 12) using PacBio, Bionano, and Hi-C technologies, and compared this assembly to genome sequences of Kokia (n = 12) and Gossypium diploids (n = 13). Previous analysis demonstrated that ...


Cryptic Trysts, Genomic Mergers, And Plant Speciation, Richard Clark Cronn, Jonathan F. Wendel Jan 2004

Cryptic Trysts, Genomic Mergers, And Plant Speciation, Richard Clark Cronn, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

It has long been recognized that interspecific hybridization is common in plants, enhancing processes of diversification and speciation. With the widespread utilization of molecular tools, interspecific hybridization – as revealed through incongruence among two or more phylogenetic data sets – is now inferred to be even more prevalent than indicated by morphological and cytogenetic evidence. UsingGossypium as an example, we show how multiple molecular markers have implicated a high frequency of historical hybridization between lineages whose modern descendants are strongly isolated by geography and intrinsic genetic barriers. For example, transoceanic dispersal of propagules from Africa to the New World led to ...


Cryptic Repeated Genomic Recombination During Speciation In Gossypium Gossypioides, Richard Clark Cronn, Randall Lee Small, Tamara Haselkorn, Jonathan F. Wendel Nov 2003

Cryptic Repeated Genomic Recombination During Speciation In Gossypium Gossypioides, Richard Clark Cronn, Randall Lee Small, Tamara Haselkorn, Jonathan F. Wendel

Ecology, Evolution and Organismal Biology Publications

The Mexican cotton Gossypium gossypioides is a perplexing entity, with conflicting morphological, cytogenetic, and molecular evidence of its phylogenetic affinity to other American cottons. We reevaluated the evolutionary history of this enigmatic species using 16.4 kb of DNA sequence. Phylogenetic analyses show that chloroplast DNA (7.3 kb), nuclear ribosomal internal transcribed spacers (ITS; 0.69 kb), and unique nuclear genes (8.4 kb) yield conflicting resolutions for G. gossypioides. Eight low-copy nuclear genes provide a nearly unanimous resolution of G. gossypioides as the basalmost American diploid cotton, whereas cpDNA sequences resolve G. gossypioides deeply nested within the American ...