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The Journal of Heredity 1994:85(3):238-241
© 1994 The American Genetic Association 85:238-241

other

A Cytogenetic Study of Six Cultivars of the Chayote, Sechium edule Sw. (Cucurbitaceae)

M. De Donato, and H. Cequea

Departamento de Biologia, Universidad de Oriente Ap. 245 Cumaná 6101, Venezuela

Abstract

A cytogenetic study of six cultivars of S. edule was carried out. A grouping of chromosomes was observed in root tips that had been pretreated with colchicine or 1-bromonaphthalene. The karyotypes were obtained from second metaphase cells due to this grouping of chromosomes. The chromosome number for each cultivar was n = 14, and the chromosome size ranged between 0.7 and 1.9 /µm. The majority of the chromosomes were metacentric. We found two chromosomes with secondary constrictions in all cultivars. Only bivalents were observed in the meiotic cells, and we found an average of about 24 chiasmata per cell. Despite fruit feature differences and some karyological differences among them, the six cultivars studied seemed to belong to the species S. edule.


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