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Changes in recombination and genetic disturbance on transferring the H2Lc2 linkage group from Gossypium tomentosum to G. barbadense and G. hirsutum

Published online by Cambridge University Press:  14 April 2009

J. H. Saunders
J. H. Saunders
Affiliation:
Agricultural Research Corporation*, Republic of the Sudan and Cotton Research Corporation
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The H2Lc2 linkage region from G. tomentosum was transferred through seven successive backcrosses to G. barbadense and G. hirsutum race punctatum in which these species were used as bulk female recurrent parents. In the last backcross, BC 7, reciprocal crosses were also made. Recombination values diminished with progressive backcrossing. Other workers have shown that values of the order of 20·0% within the pure species were to be expected. In BC 7 joint estimates for punctatum were 0·9% and 0·0% as female and male respectively; the corresponding estimates for barbadense were 5·0% and 20·1%.

Selective elimination of the donor gene H2 on transference to punctatum was observed in all backcrosses, causing disturbance to the expected 1:1 backcross ratio. Disturbance of a different order was recorded for the segment H2Lc2 transferred to barbadense. When the heterozygote H2Lc2/h2Lc2 was male and barbadense (h2lc2/h2lc2) female 50% of the H2Lc2 gametes were lost and a 1:2 backcross ratio was observed instead of the expected 1:1. The 1:1 ratio was restored when the heterozygote was the female parent. The lethal interaction of the H2Lc2tomentosum segment with an inhibitor IB from barbadense was postulated.

Differences in the reaction of the genotypes of G. barbadense and G. hirsutum race punctatum to the introgression of H2Lc2 from G. tomentosum were discussed in terms of evolutionary divergence of the species.

Type
Research Article
Information
Genetics Research , Volume 13 , Issue 1 , February 1969 , pp. 1 - 15
Copyright
Copyright © Cambridge University Press 1969

References

REFERENCES

Darlington, C. D. (1939). The Evolution of Genetic Systems. Cambridge University Press.Google Scholar
Endrizzi, J. E. (1963). Genetic analysis of six primary monosemes and one tertiary monosome in Gossypium hirsutum. Genetics 48, 1625–1633.CrossRefGoogle Scholar
Endrizzi, J. E. (1966). Additional information on chromosomal structural changes and differentiation in Gossypium. J. Arizona, Acad. Sci. 4, 28–34.CrossRefGoogle Scholar
Endrizzi, J. E. & Kohel, R. J. (1966). Use of telosomes in mapping three chromosomes in cotton. Genetics 54, 535–550.CrossRefGoogle ScholarPubMed
Gerstel, D. U. & Phillips, L. L. (1958). Segregation of synthetic amphidiploids in Gossypium and Nicotiana. Cold Spring Harb. Symp. quant. Biol. 23, 225–237.CrossRefGoogle Scholar
Giles, J. A. (1961). A third case of compensatory recombination in interspecific hybrids of Gossypium. Genetics 46, 1381–1393.CrossRefGoogle ScholarPubMed
Harland, S. C. (1936). The genetical conception of the species. Biol. Rev. 11, 82–112.CrossRefGoogle Scholar
Hutchinson, J. B. (1946). The inheritance of brown lint in New World cottons. J. Genet. 47, 295–309.CrossRefGoogle ScholarPubMed
Knight, R. L. (1945). The theory and application of the backcross technique in cotton breeding. J. Genet. 47, 76–86.CrossRefGoogle Scholar
Knight, R. L. (1952). The genetics of jassid resistance in cotton. I. The genes H1 and H2. J. Genet. 51, 48–66.CrossRefGoogle Scholar
Phillips, L. L. (1961). The cytogenetics of speciation in Asiatic cotton. Genetics 46, 77–83.CrossRefGoogle ScholarPubMed
Rhyne, C. L. (1958). Linkage studies in Gossypium. I. Altered recombination in allotetraploid G. hirsutum L. following linkage group transference from related diploid species. Genetics 43, 822–834.CrossRefGoogle ScholarPubMed
Stephens, S. G. (1949). The cytogenetics of speciation in Gossypium. I. Selective elimination of the donor parent genotype in interspecific backcrosses. Genetics 34, 627–637.CrossRefGoogle ScholarPubMed
Stephens, S. G. (1950). The internal mechanism of speciation in Gossypium. Bot. Rev. 16, 115–149.CrossRefGoogle Scholar
Stephens, S. G. (1955). Linkage in Upland cotton. Genetics 40, 903–917.CrossRefGoogle ScholarPubMed
Stephens, S. G. (1961). Recombination between supposedly homologous chromosomes of Gossypium barbodense L. and G. hirsutum L. Genetics 46, 1483–1499.CrossRefGoogle Scholar