Chromosome Numbers and Behavior in Some Species of Dioscorea

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Abstract
Chromosomes were counted at meiosis and mitosis in 4 sapogenin-bearing species of Dioscorea and 9 other species. Chromosome numbers of 7 New-World species are reported for the first time. In these, 2n numbers were 36 except in 2 lines of D. floribunda which contained 54-chromosomes and showed irregular meiosis. All New-World species had multiples of 9, whereas all Old-World species had multiples of 10. The significance of the findings is discussed with reference to origin and distribution of the genus, processes of speciation, and possible barriers to breeding.

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