Genetic effects of individual chromosomes in cotton cultivars detected by using chromosome substitution lines as genetic probes.
Determination of chromosomes or chromosome arms with desirable genes in different inbred lines and/or crosses should provide useful genetic information for crop improvement. In this study, we applied a modified additive-dominance model to analyze a data set of 13 cotton chromosome substitution lines and their recurrent parent TM-1, five commercial cultivars, and their 70 F(2) hybrids. The chromosome additive and dominance variance components for eight agronomic and fiber traits were determined. On average, each chromosome or chromosome arm was associated with 6.5 traits in terms of additive and/or dominance effects. The chromosomes or chromosome arms, which contributed significant additive variances for the traits investigated, included 2, 16, 18, 25, 5sh (short arm), 14sh, 15sh, 22sh, and 22Lo (long arm). Chromosome additive effects were also predicted in this study. The results showed that CS-B 25 was favorably associated with several fiber traits, while FM966 was favorably associated with both yield and fiber traits with alleles on multiple chromosomes or chromosome arms. Thus, this study should provide valuable genetic information on pure line development for several improved traits such as yield and fiber quality.
Department of Plant and Soil Sciences, Mississippi State University, Mississippi State, MS 39762, USA.
Jixiang
J
Wu
Johnie N
JN
Jenkins
Jack C
JC
McCarty
Sukumar
S
Saha
D000483:Alleles; D032461:Chromosomes, Plant; D032561:Cotton Fiber; D003433:Crosses, Genetic; D005799:Genes, Dominant; D003368:Gossypium / Q000235:genetics*; D007178:Inbreeding; D008957:Models, Genetic; D015335:Molecular Probes / Q000235:genetics; D010641:Phenotype
D015335:Molecular Probes