Abstract
The nuclei of two arbuscular mycorrhizal fungi, Gigaspora margarita and Glomus versiforme , were examined cytofluometrically to (i) determine their DNA amount and (ii) look for differences in their genome size during some steps of their life cycle. The fluorescence characteristics of DNA-DAPI complex revealed that DNA amount is significantly different. This value expressed as arbitrary units and then quantified by using a biological standard is of 0·25–0·27 pg per nucleus in G. versiforme and 0·74–0·77 pg per nucleus in G. margarita . There were no differences between their individual spore and hyphal phases.
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