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Summary Meiotic studies including chiasma frequency determination of Pollen Mother Cells (PMCS) and 4C DNA content from root tip cells of 6 species of Gymnocalycium of the family Cactaceae revealed significant interspecific variation in the genome. The haploid chromosome number n = 11 was recorded in G. brucbiiG. denudatum, G. borridispinum, G. mibanovicbii, G. quehlianum and G. saglionis. The chiasma frequency significantly varied from 30.45 to 34.28 per nucleus. The formation of univalent in some of the cells, spindle anomalies i.e. late or early separation leads to the formation of pentads, sexads or octads instead of tetrads formation in the meiotic telophase II through differential pollen sterility from 2.83 to 7.31% in G. mihanovicbii and G. saglionis respectively. The 4C DNA amount of root tip cells varied significantly from 12.021 to 14.661 pg in G. saglionis and G. bruchii respectively. Significant variation in DNA amount with gross or minor alteration of chiasma frequency leads to genetic drift ...

Nuclear DNA content and chiasma behaviour in six species of Gymnocalycium Pfeiff. of the family Cactaceae