Capsicum baccatum ile türler arası iki $F_1$ hibridin geriye melezlenmesi sonucu elde edilen generasyonlarda tek gen açılımları ve Mendel açılımı göstermeyen bazı karakterlerin sapma nedenlerinin açıklanması

Monogenic segregations of certain morphological and isozymic characters were studied in backcross progenies of Capsicum baccatumL. ( Solanaceae) x two interspecific F1 hybrids and distorted segregation ratios were noted. It was observed that isozyme markers Est-5, Idh-1, Pgm-2, and Pgi-2, and morphological marker gene P for fruit persistence showed distorted segregation ratios in the first backcross generation of both C. baccatumHawkes 6489 (P.G.Smith) x F1 ( C. baccatum Hawkes 6489 x Capsicum cardenasii Heiser Smith) and C. baccatum SA219 (P.G.Smith) x F1 ( C. baccatum SA219 x Capsicum eximiumA.T.Hunz). Both progenies and an excess of individuals carrying alleles inherited from C. baccatum. A further gene, y, controlling fruit colour and segregating in the backcross of C. baccatum Hawkes 6489 x F11 ( C. baccatum Hawkes 6489 x C. cardenasii), also showed a distorted segregation ratio with an excess of homozygous individuals. However, in backcross families from interspecific crosses, Skdh-1 showed a distorted segregation ratio with an excess of heterozygous individuals.

Monogenic segregations in backcross progenies of capsicum baccatum x two interspecific $F_1$ hybrids and some possible explanations for distorted segregation ratios in Capsicum

PDF

___

1. Pandey, K.K., Evolution of unilateral incompatibility in flowering plants: Further evidence in favour of twin specificities controlling intra and interspacific incompatibility. New Phytol, 89:705- 728,1981.
2. Hogenboom, N.G., Incompatibility and incongruity: Two different mechanisms for the non-matching of intimate partner relationship. Proc.R. Soc.Lond., B 188,361-375,1975.
3. Stephens, S.G., The cytogenetics of speciation in Gossypium. I. Selective elimination of donor genotype in interspecific backcrosses. Genetics, 34:627-637,1949.
4. Rick, C.M., Controlled integression of Solanum pennellii into Lycopersicn esculentum: segregation and recombination. Genetics, 62:627-637,1949.
5. Zamir, D., Tanksley, S.D., Jones, A.R., Haploids selection for low tempearature tolerance for tomato pollen. Genetics, 101:129- 137,1982.
6. Vallejos, C.E., Tanksley, S.D., Segregation of isozyme markers and cold tolerance in an interspecific backcross of tomato. Theor. App. Genet., 66:241-247,1983.
7. Tanksley, S.D., Loaiza-Figueroa, F., Gametophytic self-incompatibility is controlled by a single major locus on chromosome I in Lycopersicon peruvianum. Natl. Acad. Sci., USA., 82:5093- 5096,1985.
8. Zamir, D., Tadmor, Y., Unequal segregation of nuclear genes in plant. Bot. Gaz., 147 (3), 355-358,1986.
9. Murashige, T., Soog, F., A revised medium for rapid growth and bioassays with tobacco tissue culture, Physiol. Plant. 15:473- 497,1962.
10. Martin, F.W., Staining and observing of pollen tubes in the style by means of fluorescence, Stain Technol.,34:125-128,1959.
11. Mcleod, M.J., Eshbaugh, W.H., Gutman, S.I., A preliminary biochemical systematic study of the genus Capsicum. In: The biology and taxonomy of the Solanaceae (Eds. J.G. Hawkes, R.N. Lester and A.D. Skelding), Linnean Society Symposium Series No, 7, pp. 701-714. Academic Press, London, 1979.
12 Paddle, G.M., bissell, A.F., Frequency data and contingency tables. In: Statistical methods in research and production (Eds: O.L., Davies and P.L., Goldsmith), pp. 304-336. Published for Imperial Chemical Industries Limited by Oliver and Boyd, Tweedale Court, Edinburgh, 1972.
13. Onus, A.N., Pickersgill, B., A study of selected isozymes in Capsicum baccatum, C. eximium, C. cardenasii and two F1 hybrids in Capsicum. Turkish Journal of Botany (in press).
14. Grant, V., Genetics of flowering plant. Columbian University Press, New York, 1975.
15. Marshall, L.,D., Folsom, M.W., Mate choice in plants: An anatomical population perspective. Annu. Rev. Ecol. Syst., 22:37- 63,1991.
16. Pickersgill, B., Cytogenetics and evolution of Capsicum L. In: Chromosome engineering in plants: Genetics, Breeding, Evolution (Eds. T.Tsuchiya and P.K. Gupta) Part B. Pp. 139-159,1991.
17. Burnham, C.R., Chromosamal interhages in plants, Bot Rev., 41:49-62, 1956.