Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Abstract Only
Publication Acceptance Date: 1/9/2007
Publication Date: 6/25/2007
Citation: Gutierrez, O., Jenkins, J.N., McCarty Jr., J.C., Bowman, D.T., Watson, C.E., Jones, D.C., Cantrell, R. 2007. Development and release of C5 breeding populations of cotton developed through random mating [abstract]. National Cotton Council Beltwide Cotton Conference. p. 639.
Technical Abstract: Random mating crossing schemes have been successfully utilized in self and cross-pollinated crops to break negative associations between traits. The objectives of this study were: 1) to develop improved breeding populations via the breakage of negative linkages and accumulation of favorable linkages and 2) to assess the effect of five cycles of random mating on recombination among agronomic traits. Eleven upland cotton genotypes were selected based on their area of origin and diversity in term of gene pools. Chosen lines were intercrossed in a half diallel-crossing scheme in 2002. Bulked pollen methodology was used for six consecutive growing seasons (2003-2005) at Tecoman, Colima, Mexico and Mississippi to obtain fifty-five half-sib families. Three different experiments were grown at the Plant Science Research Center, Mississippi State, MS in the summer of 2006 at two locations in a randomized complete block design with four replicates. In the first experiment, parents and a bulk seed of half sib families C0S1 and C5S1 (13 entries) were evaluated. Secondly, parents and a bulk seed from all of the half sib families C0S1 to C5S1 (17 entries) were tested. In the last experiment parents and half sib families from cycles C0S1 and C5S1 (132 entries) were evaluated. Results indicated that recombination for alleles that condition most of the agronomic and fiber traits were obtained since significant differences were observed for most of the agronomic and fiber traits. This population represents an excellent germplasm source that could be used by breeders to develop improved cultivars.