Abstract
The duration of the complete mitotic cycle and its component phases were compared with the amounts of 2C nuclear DNA, heterochromatin DNA and euchromatin DNA in four Lathyrus species. The total cycle time as a whole was not correlated with the variation in 2C nuclear DNA amount which was two fold between the 4 related species. However, the duration of synthesis phase was positively correlated with the amounts of total DNA and heterochromatin DNA. The results have further shown that a disproportionate increase in the amount of heterochromatin in the genome can increase the total duration of the mitotic cycle as well as the duration of its component phases.
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