Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract only
Publication Acceptance Date: 1/4/2005
Publication Date: 6/1/2005
Citation: Gutierrez, O.A., Jenkins, J.N., McCarty Jr., J.C., Bowman, D.T., Watson, C.E. 2005. Development of breeding populations in cotton through random mating [abstract]. National Cotton Council Beltwide Cotton Conference. p. 1000. Interpretive Summary:
Technical Abstract: Collection, evaluation, development, and maintenance of crop germplasm have been priorities for public crop improvement programs. The hybridization of superior cultivars followed by selection in a breeding program has been the main approach utilized to obtain genetic improvement of cotton. Grower demands for higher yield and better fiber quality and a strictly mechanized farming system as well as many other factors have narrowed the germplasm base in cotton. Genetic diversity provides protection against disease or insect epidemics and is the basis for future genetic gain. Linkages between desirable and undesirable loci can contribute to slow genetic progress from selection. Random mating has been successfully used in self and cross pollinated crops to break negative association between traits. The objectives of this study were: 1) to develop improved populations via breakage of linkages and accumulation favorable linkages and 2) to assess effect of 3 cycles of random mating on recombination and correlations. Fifty-five half-sib families Cycles C0, C1, and C2 developed by bulked-pollen methodology and fifty-five F2-bullk populations were grown at the Plant Science Research Center, Mississippi State, MS in the summers of 2003 and 2004 at two locations in a randomized complete block design with four replications. Results indicated that even though there was strong genotype by environment interaction for the F2 bulk-populations some of them performed better than either parent indicating the presence of heterosis for some F2 bulk-populations. Means of half-sib families for cycles C0, C1, and C2 indicated that most of the time they perform better than parents with the exception of the best adapted parents. Random mating is a good tool that can be used in the development of improved breeding populations in cotton.