The inheritance model for the fiberless trait in upland cotton (<Emphasis Type="Italic">Gossypium hirsutum</Emphasis> L.) line SL1-7-1: variation on a theme |
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| Authors: | Rickie B Turley Reiner H Kloth |
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| Institution: | (1) USDA-ARS, Crop Genetics and Production Research, P.O. Box 345, Stoneville, MS 38776-0345, USA;(2) 1462 Ollie Cir., Greenville, MS 38703, USA |
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| 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. |
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| Keywords: | Fiber initiation Fiberless seed Fuzzless seed Gossypium hirsutum Inheritance Naked seed |
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