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Early testing of parental combining ability in tropical cauliflower hybrids

W.R. Maluf^I; R.D. Corte^I; M. Toma-Braghini^I; L.S. Caldas^I; H. Ikuta^II; M. Kunieda-Yabase^III

^IBioplanta Tecnologia de Plantas S.A., Caixa Postal 1141, 13100 Campinas, SP, Brasil. Send correspondence to W.R.M.
^IIDepartamento de Genética, ESALQ, Universidade de São Paulo, 13400 Piracicaba, SP, Brasil
^IIIDepartamento de Biologia, Universidade Braz Cubas, 08765 Mogi das Cruzes, SP, Brasil

ABSTRACT

TeCauliflower clones selected from the population Piracicaba Precoce' (CFP) and heat tolerant male sterile (MEV) clones selected from the F₂ of (male-sterile `Terezópolis Gigante' x CFP) were tested for combining ability with different pollen parents. General combining ability estimates (GCA) were obtained by the unweighted least squares procedure. Clones of CFP showed ample range of GCA effect estimates for curd diameter, weight, quality and maturity. From the two pollen parents utilized with CFP clones, the open pollinated population `Gigante Jaraguá' (GJ) had better GCA than `Terezópolis Precoce' clone 12 (NTCF-12), but the amplitude of the variation between their GCA's was narrower than the amplitude of variation among the seed parent clones themselves. MEV clones also showed an ample range of GCA effects. For MEV clones, four different pollen parents were utilized: GJ, CFPcom (the open pollinated population CFP), CFP-1338 and CFP-38, the latter two being different homozygous self-incompatible inbreds derived from CFP. CFP-1338 and CFP-38 (especially the latter) had better GCA with MEV clones than CFPcom, and CFPcom better GCA than GJ. The genetic model utilized accounted for more than 80% of the total variation for all traits under study, indicating that early testing might provide an efficient way to predict combining ability in cauliflower.xto

Keywords: parental; ability; tropical; cauliflower; hybrids.

REFERENCES

Baldini, A.L.C. and Silva, N. (1985a). Estimativas de parâmetros genéticos em couve-flor. Hort. Bras. 3:21-2 3.

Baldini, A.L.C. and Silva, N. (1985b). Conseqüências de uma geração de endogamia em couve-flor cv. Piracicaba Precoce No. 1. Hort. Bras. 3:24-26.

Chatterjee, S.S. and Seshadri, V.S. (1984). Vegetables in India. In: Sociedade de Olericultura do Brasil. XXVI Congresso Brasileiro de Olericultura - I Reunião Latino Americana de Olericultura - Palestras, Jaboticabal, São Paulo, Brasil, 16-21 July 1984. pp. 214-229.

Comstock, R.E. and Robinson, H.E. (1948). The components of genetic variance in populations of biparental progenies and their use in estimating the average degree of dominance. Biometrics 4: 254-266.

Dias, M.S. (1966). Couve-flor: semente dá trabalho. Guia Rural 1966/1967. Editora Abril, São Paulo, pp. 134-141.

Dickson, M.H. and Wallace, D.H. (1986). Cabbage breeding. In: Breeding vegetable crops (M.J. Bassett, ed.). AVI, Westport. pp. 395-432.

Federer, W.T. (1956). Augmented (or Hoonuiaku) designs. The Hawaiian Planters Record 55: 191-208.

Gordon, G.H. (1980). A method of parental selection and cross prediction using incomplete partial diallels. Part 1. A simulation study. Theor. Appl. Genet. 56: 225-232.

Honma, S. and Cash, J.N. (1986). `Supreme', `Beta-White' and `One-Up' cauliflower. Hort-Science 21: 1076.

Ikuta, H. and Paterniani, E. (1979). Produtividade de sementes de linhagens homozigóticas auto-incompatíveis da cultivar de couve-flor Piracicaba Precoce No. 1. Relat. Cientef. Inst. Genét. Esc. Supl. Agric. Luiz de Queir6z/Universidade de São Paulo 13: 138-148.

Shinohara, S. (1981). Principles of Vegetable Seed Production. Vegetable Crops Production Course, JICA-Tsukuba International Agricultural Training Center, Tsukuba, Japan. Textbook V.C. 26. 226 pp.

Shinohara, S. (1984). Vegetable Seed Production Technology of Japan, elucidated with respective variety development histories, particulars. vol. 1. Tomie Press, Tokyo. 433 pp.

Torres, A.C., Vecchia, P.T.D. and Caldas, L.S. (1978). Propagação vegetativa de couve-flor (Brassica oleracea var. botrytis subvar. cauliflora D.C.) in vitro visando ao melhoramento de cultivares de verão. Revista Ceres 25: 602-609.