Abstract
SUMMARYThe karyotype and meiosis of wild and cultivated ulluco were analysed. All wild ulluco clones studied were triploids, 2n = 36, and all cultivated ones diploids, 2n = 24. A tetraploid cell line, 2n = 48 was found in a cultivated clone. Cultivated and wild ulluco have a similar set of chromosomes, with two pair of long, two pair of short and eight pair of intermediate chromosomes, and with two pair of satellite chromosomes. This indicates that the basic chromosome number of ulluco may be x = 6. Male and probably also female meiosis of diploid cultivated ulluco is regular and pollen stainability high. Reasons for the poor seed set of cultivated ulluco are to be looked for in other processes than meiosis. Meiosis of triploid wild ulluco is irregular, leading predominantly to aneuploid gametes, pollen stainability was low, and there was more variation in pollen size than in cultivated ulluco, most probably because of aneuploidy.
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