Abstract
The ploidy levels of ninety Guinea yam (Dioscorea cayenensis/D. rotundata complex) cultivars identified within Benin were determined by both chromosome counting from root tip cells and flow cytometry. Three different ploidy levels (4x, 6x, 8x) were detected among the samples. Eighty cultivars were tetraploid, five were hexaploid, three were octoploid and two cultivars, 'Tam-Sam' and 'Youbé' were mixoploid with both 4x and 8x ploidy levels. Chromosome counts were in agreement with data from flow cytometry that provides an easier assay for ploidy analysis. Flow cytometry was found to be a reliable tool for rapid determination of ploidy level in yam. (African Crop Science Journal 8(4) 2000: 355-364)
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