1. The inheritance model for the fiberless trait in upland cotton (Gossypium hirsutum L.) line SL1-7-1: variation on a theme
- Author
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Reiner H. Kloth and Rickie B. Turley
- Subjects
Genetics ,Lint ,Wild type ,Locus (genetics) ,Plant Science ,Horticulture ,engineering.material ,Biology ,biology.organism_classification ,Fiber crop ,Phenotype ,Genotype ,Botany ,engineering ,Allele ,Agronomy and Crop Science ,Malvaceae - Abstract
Segregating populations were developed to evaluate the inheritance of the fiberless seed phenotype of upland cotton (Gossypium hirsutum L.) line SL1-7-1. We report the inheritance of fuzzy, fuzzless and fiberless seed from crosses of SL1-7-1 with wildtype DP5690, Mexican fuzzless seed UA 3-3 (accession 143), Ballard fuzzless seed (accession 243), and MD17. Results from the F1, F2 and F2:3 progeny derived from the SL1-7-1 X DP5690 indicated that the expression of the fiberless phenotype fit a three loci model with one locus being the dominant fuzzless seed allele N 1 . The other two loci were tested to verify whether they were allelic to either recessive fuzzless seed alleles n 2 or n 3 . Using the segregation ratios of the F2 progeny derived from the 143 X SL1-7-1 cross and F2-derived F3 families from SL1-7-1 X DP5690 with fuzzy seed (lacked N 1 ), it is proposed that SL1-7-1 lacks the recessive n 2 allele, but contains the n 3 allele in the genotype of SL1-7-1. The third locus was previously not characterized and has been designated as fl 1 (fiberless), therefore, the genotype for the fiberless phenotype of SL1-7-1 is N 1 N 1 fl 1 fl 1 n 3 n 3 . Fiberless lines MD17 X SL1-7-1 were crossed to verify similarities in genotypes between line and the genotype model predictability. Various combinations of the homozygous and heterozygous expression of N 1 , n 2 , n 3 and fl 1 allele produced plants with lower lint percentages.
- Published
- 2008
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