Abstract
This paper presents the karyotype, DNA content and meiotic behaviour of five species ofViciafrom Argentina (V. macrogramineaBurk.,V. gramineaSM.,V. epetiolarisBurk.,V. pampicolaBurk. andV. nanaVog.). All the species have the same chromosome number and karyotype formula (2n=14; 6m+4st+4t). Each species, however, displays a characteristic number and position of the nucleolar organizer region (NOR) and different sizes of the respective satellites, confirmed by Ag-NOR banding. Moreover, significant differences were found in the total chromosome volume (TCV) and DNA content of the species. Positive correlations between DNA content and TCV, and between DNA content and type of life cycle were also found. TCV and DNA content are lower inV. nana(annual) and higher inV. macrograminea(biennial–perennial). The material displayed marked karyotypic orthoselection, with similar karyotypes in all studied species, even when the overall chromosome size varied. Evolutionary changes in DNA amount are proportional to the relative length of each chromosome arm, maintaining karyotypic uniformity. Significant differences were found between the meiotic behaviour ofV. gramineaand that of the other species.V. gramineahas a lower frequency of ring bivalents and chiasmata per cell, and also has a lower interstitial chiasma frequency. In general, the results are congruent with the morphological data reported for these species.
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