ARS | Publication request: GENETIC STABILITY OF A MAJOR QTL FOR FIBER STRENGTH AND ITS MARKER-ASSISTED SELECTION IN UPLAND COTTON

Submitted to: Plant and Animal Genome VX Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: January 16, 2002
Publication Date: January 16, 2002

Technical Abstract: The genetic stability of a major QTL for fiber strength and its efficiency of marker-assisted selection were studied in 243 progenies in different generations of four combinations using 7235 as parent, which is characterized as good fiber quality, using two RAPD markers, FSR1933 and FSR41047, and a SSR marker, FSS1130. The present results revealed that the QTL for fiber strength associated with three markers inherited steadily in different backgrounds and segregating generations. The mean difference of fiber strength between individuals of FSR1933 and FSR41047 markers were not decreased after several generations of selfing and backcrossing. There was a significant difference, 25.68 cN/tex //24.03cN/tex and 26.14 cN/tex //23.66cN/tex in the mean of fiber strength with and without FSR1933 and FSR41047, respectively. Additionally, the fiber strength means of homozygote plants with and without FSS1130 SSR marker were 25.94 cN/tex and 24.03 cN/tex. Their difference was significant too. The fiber strength mean of heterozygote identified with SSR marker, FSS1130 was 24.94cN/tex. The difference between heterozygote and other genotypes was not significant. Genes for fiber strength and Bt were pyramided by MAS to develop high quality fiber strength and insect-resistance. It was concluded that the marker-assisted selection to increase fiber strength is possible just using this major QTL.