Abstract:
Based on the established SSR-based BC1 genetic linkage map, 2 genetic maps covered with 313 markers have been
developed for 2 more backcross populations which was aimed to study the difference of recombination rates between male
and female gametes. The total lengths of genetic maps for male and female were 4532.9cM and 4464.4cM respectively, and
the average marker distances were 14.48cM and 14.26cM respectively. The results showed that there was no difference for
the recombination rates between male and female gametes on the total map length and the average marker interval. There
were 6 linkage groups showing significant differences between the 2 populations, which indicated that the gamete
recombinant rates can only influence some chromosomes in cotton. Although a lot of marker intervals showed difference
between maps, only 17 marker intervals were caused by the male and female gametes recombination rates. Further
investigation showed that the male gamete mainly resulted in a longer genetic distance between markers, and increased the
recombination rates; while the female gamete usually resulted in a shorter genetic distance of marker interval, and decreased
the recombination rates. The present results will give us some useful instructions in cotton genetics and breeding.
