Genetic mapping of a cross between Gossypium hirsutum (cotton) and the Hawaiian endemic, Gossypium tomentosum.

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TitleGenetic mapping of a cross between Gossypium hirsutum (cotton) and the Hawaiian endemic, Gossypium tomentosum.
AuthorsWaghmare VN; Rong J; Rogers CJ; Pierce GJ; Wendel JF; Paterson AH
TypeJournal Article
Journal NameTheoretical and Applied Genetics
Volume111
Issue(4)
Year2005
Page(s)665 676
Publication CodeTAG-111-665

Abstract

The existence of five tetraploid species that derive from a common polyploidization event about 1 million years ago makes Gossypium (cotton) an attractive genus in which to study polyploid evolution and offers opportunities for crop improvement through introgression. To date, only crosses (HB) between the cultivated tetraploid cottons Gossypium hirsutum and G. barbadense have been genetically mapped. Genetic analysis of a cross (HT) between G. hirsutum and the Hawaiian endemic G. tomentosum is reported here. Overall, chromosomal lengths are closely correlated between the HB and HT maps, although there is generally more recombination in HT, consistent with a closer relationship between the two species. Interspecific differences in local recombination rates are observed, perhaps involving a number of possible factors. Our data corroborate cytogenetic evidence that chromosome arm translocations have not played a role in the divergence of polyploid cottons. However, one terminal inversion on chromosome (chr.) 3 does appear to differentiate G. tomentosum from G. barbadense\\; a few other apparent differences in marker order fall near gaps in the HT map and/or lack the suppression of recombination expected of inversions, and thus remain uncertain. Genetic analysis of a discrete trait that is characteristic of G. tomentosum, nectarilessness, mapped not to the classically reported location on chr. 12 but to the homoeologous location on chr. 26. We propose some hypotheses for further study to explore this incongruity. Preliminary quantitative trait locus (QTL) analysis of this small population, albeit with a high probability of false negatives, suggests a different genetic control of leaf morphology in HT than in HB, which also warrants further investigation.
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TM-1 x WT-936, F2 (2005)
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URLhttp://www.springerlink.com/content/100386/
pISSN0040-5752
Journal CodeTAG
eISSN1432-2242
Journal AliasTheoretical and Applied Genetics. Theoretische und angewandte Genetik
PublisherSpringer; Springer-Verlag GmbH
Published LocationGermany
Publication CodeTAG-111-665
LanguageEnglish
Keywords*Chromosome Mapping; underlying quantitative traits; Chromosomes, Plant/genetics; Gossypium/anatomy & histology/*genetics; *Hybridization, Genetic; *Phenotype; Plant Leaves/anatomy & histology; Polyploidy; Quantitative Trait Loci; Gossypium hirsutum; cotton; Gossypium tomentosum; wild relatives; interspecific hybridization; cytogenetics; chromosome morphology; genetic recombination; chromosome inversions; DNA probes; complementary DNA; leaves; plant morphology; nectaries