Chromosomal Assignment of RFLP Linkage Groups Harboring Important QTLs on an Intraspecific Cotton (Gossypium hirsutum L.) Joinmap

Chromosome identities were assigned to 15 linkage groups of the RFLP joinmap developed from four intraspecific cotton (Gossypium hirsutum L.) populations with different genetic backgrounds (Acala, Delta, and Texas Plains). The linkage groups were assigned to chromosomes by deficiency analysis of pro...

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Bibliographic Details
Published in:The Journal of heredity 2005-03, Vol.96 (2), p.132-144
Main Authors: Ulloa, M, Saha, S, Jenkins, J. N, Meredith, W. R, McCarty, J. C, Stelly, D. M
Format: Article
Language:English
Subjects:
Agriculture - methods
agronomic traits
chromosomal location
Chromosome Mapping
Chromosomes
Cotton
Cotton Fiber
DNA, Complementary
fiber quality
Gene loci
Genetic Linkage
Genetic Markers - genetics
Genomics
Gossypium - genetics
Gossypium hirsutum
linkage groups
Plant populations
Polymorphism, Restriction Fragment Length
Quantitative Trait Loci
restriction fragment length polymorphism
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Summary:Chromosome identities were assigned to 15 linkage groups of the RFLP joinmap developed from four intraspecific cotton (Gossypium hirsutum L.) populations with different genetic backgrounds (Acala, Delta, and Texas Plains). The linkage groups were assigned to chromosomes by deficiency analysis of probes in the previously published joinmap, based on genomic DNA from hypoaneuploid chromosome substitution lines. These findings were integrated with QTL identification for multiple fiber and yield traits. Overall results revealed the presence of 63 QTLs on five different chromosomes of the A subgenome (chromosomes-03, -07, -09, -10, and -12) and 29 QTLs on the three different D subgenome (chromosomes-14 Lo, -20, and the long arm of -26). Linkage group-1 (chromosome-03) harbored 26 QTLs, covering 117 cM with 54 RFLP loci. Linkage group-2, (the long arm of chromosome-26) harbored 19 QTLs, covering 77.6 cM with 27 RFLP loci. Approximately 49% of the putative 92 QTLs for agronomic and fiber quality traits were placed on the above two major joinmap linkage groups, which correspond to just two different chromosomes, indicating that cotton chromosomes may have islands of high and low meiotic recombination like some other eukaryotic organisms. In addition, it reveals highly recombined and putative gene abundant regions in the cotton genome. QTLs for fiber quality traits in certain regions are located between two RFLP markers with an average of less than one cM (0.4[approximately]0.6 Mb) and possibly represent targets for map-based cloning. Identification of chromosomal location of RFLP markers common to different intra- and interspecific-populations will facilitate development of portable framework markers, as well as genetic and physical mapping of the cotton genome.
ISSN:0022-1503
1465-7333
DOI:10.1093/jhered/esi020