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The Journal of Heredity 1988:79(4):306-308
© 1988 The American Genetic Association 79:306-308

research-article

Restitution Gametes in Sugar Beet Primary Trisomics

I. Romagosa, L. Cistue, J. M. Lasa, and R. J. Hecker

Department of Agronomy, University Politecnica de Cataluña Lerida
Aula Dei Experiment Station Zaragosa, Spain
Crops Research Laboratory, USDA-ARS Fort Collins, Colorado

Address reprint requests to Prof. Romagosa, Department of Agronomy, University Politecnica de Cataluña, 25006 Lerida, Spain.

Abstract

Restitution gametes were observed at the end of the meiotic cycle in five primary trisomic types of sugar beet (Beta vulgaris L., 2n = 18). Nuclear restitution as measured by the percentage of pollen mother cells showing triads or dyads at the sporad stage was less than 2% for four trisomic types. Dosage effects of chromosome 5 seemed to enhance 2n pollen formation. Rants trisomic for chromosome 5 showed triads and dyads at the sporad stage with a frequency ranging from 6 to 48% among plants. Conclusive evidence of sexual polyploidization was shown by the presence of 28 chromosome progeny obtained from 2x x (2x + 1) and (2x + 1) x (2x + 1) crosses. The average frequency oftriploids on the offspring of Triplo 5 was 4% in plants of a homozygous trisomic series and8% among plants of the other available series.


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