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Evaluation of interspecific hybridization in the genus Cucumis L.^*

Maria Elisa A.G. Zagatto Paterniani; Cyro Paulino da Costa

Departamento de Genética, Escola Superior de Agricultura Luiz de Queiróz - USP, Caixa Postal 83, 13400 Piracicaba, SP, Brasil

ABSTRACT

Wild species of African origin of the genus Cucumis were crossed to gherkin (Cucumis anguria) in order to evaluate the degree of interspecific relationship that could be used to increase the genetic variability of the cultivated species.
Interspecific crosses were also made for compatibility studies within the genus.
The degree of interspecific hybridization was evaluated through the percentage of fruit set, quantity and quality of seeds, and viability of the F₁ plants.

Keywords: Interspecific hybridization; Cucumis.

REFERENCES

Custers, J.B.M., Nijs, A.P.M. Den and Riepma, A.W. (1981). Reciprocal crosses between Cucumis africanus L.f. and C. africanus; III - Effects of pollinations aids, physiological condition and genetic constitution of the maternal parent on crossability. Cuc. Gen. Coop. Rep. 4: 50-53.

Deakin, J.R., Bohn, G.W. and Whitaker, W. (1971). Interspecific hybridization in Cucumis. Econ. Bot. 25: 195-211.

Kho, Y.O., Nijs, A.P.M. Den and Franken, J. (1980a). Interspecific hybridization in Cucunits L.; II - The crossability of species, an investigation of in vivo pollen tube growth and seed set. Euphytica 29: 661-672.

Kho, Y.O., Nijs, A.P.M. Den and Franken, J. (1980b). In vivo pollen tube growth as a measure on interspecific incomgruity in Cucumis L. Cuc. Gen. Coop. Rep. 3: 52-54.

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Nijs, A.P.M. Den (1982). Inheritance of resistance to cucumber green mottle virus (C. Gm.) in Cucumis anguria L. Cuc. Gen. Coop. Rep. 5: 57-58.

Nijs, A.P.M. Den, Visser, D.L. and Custers, J.B.M. (1981). Seedling death in interspecific crosses with Cucumis africanus. L.F. Cuc. Gen. Coop. Rep. 4: 58-60.

Nijs, A.P.M. Den and Visser, D.L. (1985). Relationship between african species of the genus Cucumis L. estimated by the production, vigour and fertility of F₁ hybrids. Euphytica 34: 279-290.

Oost, E.H. and Nijs, A.P.M. Den (1979). Mentorpollen as a tool in interspecific hybridization in Cucumis. Cue. Gen. Coop. Rep. 2: 43-44.

* Part of a thesis presented by M.E.A.G.T.P. to the Departamento de Genética, ESALQ-USP, in partial fulfilment of the requirements for the Master's degree.