Abstract
SUMMARYDetailed meiotic studies were conducted for the first time on nine haploid plants representing four different genotypes of cucumber (Cucumis sativus L. n = x =7). At diakinesis and metaphase I frequency of rod type bivalents was very low (0.1 per pollen mother cell—PMC) being observed in 4.3% of PMCs of one haploid plant. The frequency of diads, triads and polyads (72–84%) was higher than tetrads and pollen was 100% sterile. Very rare bivalents associations and fragmentations of chromosomes are discussed as well as divisions of chromosomes up to chromonema. It is concluded that very little chromosome homology and no evidence of duplication is to be found within the haploid set of cucumber chromosomes and that the basic chromosome number is seven.
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