HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

What's this?

This Article Full Text Full Text (PDF) Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Web of Science (23) Citing Articles via Google Scholar Google Scholar Articles by Gross, B. L. Articles by Rieseberg, L. H. Search for Related Content PubMed Articles by Gross, B. L. Articles by Rieseberg, L. H. Agricola Articles by Gross, B. L. Articles by Rieseberg, L. H. Social Bookmarking                            What's this?

Origin(s) of the diploid hybrid species Helianthus deserticola (Asteraceae)¹

Department of Biology, Indiana University, Jordan Hall 142, 1001 East Third Street, Bloomington, Indiana 47405 USA

Homoploid hybrid speciation has traditionally been considered a rare event, dependent on the establishment of both a novel, balanced genotype and reproductive isolating barriers between the new species and its progenitors. However, more recent studies have shown that synthetic hybrids converge toward the chromosomal structure of natural hybrids after only a few generations, suggesting that this phenomenon may be more frequent than previously assumed. Here, the possibility that the diploid hybrid species Helianthus deserticola arose from more than one hybrid speciation event was investigated using patterns of variation from cpDNA, 18 nuclear microsatellite loci, and population interfertility. Helianthus deserticola contains cpDNA haplotypes characteristic of both parental species, is polyphyletic with one parental species based on nine microsatellite loci, and has a high degree of interfertility among populations. The data are consistent with either a single origin followed by introgression with the parental species or multiple origins. Analysis of microsatellite variation places the origin of H. deserticola between 170 000 and 63 000 years before present, making it unlikely that anthropogenic disturbances influenced its origin. Finally, the hybrid species generally has lower levels of genetic diversity but higher levels of differentiation among populations than either parental species.

Key Words: Asteraceae • Helianthus • hybrid speciation • hybridization • parallel speciation • phylogeography • sunflowers

CiteULike    Complore    Connotea    Del.icio.us    Digg    Facebook    Reddit    Technorati    Twitter    What's this?

This article has been cited by other articles:

				A. F. Heesacker, E. Bachlava, R. L. Brunick, J. M. Burke, L. H. Rieseberg, and S. J. Knapp Karyotypic Evolution of the Common and Silverleaf Sunflower Genomes The Plant Genome, November 1, 2009; 2(3): 233 - 246. [Abstract] [Full Text] [PDF]

				B. Frajman, F. Eggens, and B. Oxelman Hybrid Origins and Homoploid Reticulate Evolution within Heliosperma (Sileneae, Caryophyllaceae)--A Multigene Phylogenetic Approach with Relative Dating Syst Biol, July 3, 2009; (2009) syp030v1. [Abstract] [Full Text] [PDF]

				J. L. Strasburg, C. Scotti-Saintagne, I. Scotti, Z. Lai, and L. H. Rieseberg Genomic Patterns of Adaptive Divergence between Chromosomally Differentiated Sunflower Species Mol. Biol. Evol., June 1, 2009; 26(6): 1341 - 1355. [Abstract] [Full Text] [PDF]

				K. M. Olsen and B. L. Gross Detecting multiple origins of domesticated crops PNAS, September 16, 2008; 105(37): 13701 - 13702. [Full Text] [PDF]

				I. J. Maureira-Butler, B. E. Pfeil, A. Muangprom, T. C. Osborn, and J. J. Doyle The Reticulate History of Medicago (Fabaceae) Syst Biol, June 1, 2008; 57(3): 466 - 482. [Abstract] [Full Text] [PDF]

				Y. Yatabe, N. C. Kane, C. Scotti-Saintagne, and L. H. Rieseberg Rampant Gene Exchange Across a Strong Reproductive Barrier Between the Annual Sunflowers, Helianthus annuus and H. petiolaris Genetics, April 1, 2007; 175(4): 1883 - 1893. [Abstract] [Full Text] [PDF]

				L. C. Brouillette, D. M. Rosenthal, L. H. Rieseberg, C. Lexer, R. L. Malmberg, and L. A. Donovan Genetic Architecture of Leaf Ecophysiological Traits in Helianthus J. Hered., March 1, 2007; 98(2): 142 - 146. [Abstract] [Full Text] [PDF]

				X.-F. Ma, A. E. Szmidt, and X.-R. Wang Genetic Structure and Evolutionary History of a Diploid Hybrid Pine Pinus densata Inferred from the Nucleotide Variation at Seven Gene Loci Mol. Biol. Evol., April 1, 2006; 23(4): 807 - 816. [Abstract] [Full Text] [PDF]

				Z. Lai, T. Nakazato, M. Salmaso, J. M. Burke, S. Tang, S. J. Knapp, and L. H. Rieseberg Extensive Chromosomal Repatterning and the Evolution of Sterility Barriers in Hybrid Sunflower Species Genetics, September 1, 2005; 171(1): 291 - 303. [Abstract] [Full Text] [PDF]

				B. L. Gross and L. H. Rieseberg The Ecological Genetics of Homoploid Hybrid Speciation J. Hered., May 1, 2005; 96(3): 241 - 252. [Abstract] [Full Text] [PDF]