Advanced Backcross QTL Analysis of Fiber Strength and Fineness in a Cross between and .

The molecular genetic basis of cotton fiber strength and fineness in crosses between and (Upland cotton) was dissected using 21 BCF and 12 corresponding BCF and BCF families. The BCF families were genotyped with simple sequence repeat markers from a by linkage map, and the three generations of BC-derived families were phenotyped for fiber strength (STR) and fineness (Micronaire, MIC). A total of 42 quantitative trait loci (QTLs) were identified through one-way analysis of variance, including 15 QTLs for STR and 27 for MIC, with the percentage of variance explained by individual loci averaging 13.

Segregation distortion and genome-wide digenic interactions affect transmission of introgressed chromatin from wild cotton species.

This study reports transmission genetics of chromosomal segments into Gossypium hirsutum from its most distant euploid relative, Gossypium mustelinum . Mutilocus interactions and structural rearrangements affect introgression and segregation of donor chromatin. Wild allotetraploid relatives of cotton are a rich source of genetic diversity that can be used in genetic improvement, but linkage drag and non-Mendelian transmission genetics are prevalent in interspecific crosses.

QTL analysis of cotton fiber length in advanced backcross populations derived from a cross between Gossypium hirsutum and G. mustelinum.

QTLs for fiber length mapped in three generations of advanced backcross populations derived from crossing Gossypium hirsutum and Gossypium mustelinum showed opportunities to improve elite cottons by introgression from wild relatives. The molecular basis of cotton fiber length in crosses between Gossypium hirsutum and Gossypium mustelinum was dissected using 21 BCF and 12 corresponding BCF and BCF families. Sixty-five quantitative trait loci (QTLs) were detected by one-way analysis of variance.

Fine mapping QMi-C11 a major QTL controlling root-knot nematodes resistance in Upland cotton.

The identification and utilization of a high-level of host plant resistance is the most effective and economical approach to control root-knot nematode (Meloidogyne incognita). In an earlier study, we identified a major quantitative trait locus (QTL) for resistance to root-knot nematode in the M-120 RNR Upland cotton line (Gossypium hirsutum L.) of the Auburn 623 RNR source.