Abstract
The basic karyotype of the hexaploid R. acetocella (2n=42) were compared with its progenitor diploid R. angiocarpus (2n=14). Both the species are dioecious. The sex chromosomes of R. acetosella were in active evolutionary state and a little differentiation had taken place in the autosomes. On the contrary, the sex chromosomes of R. angiocarpus have been reported to be stable while the autosomes show considerable repatterning.The basic karyotype of the two species resembled closely. The corresponding chromosome by chromosome and total chromosome length comparisons of the diploid and the hexaploid species revealed that chromatin loss, decrease of 19.62 precent from the expected, has occured during the evolution of R. acetosella subsequent to polyploidization. The chromatin loss had caused higher degree of karyotypic asymmetry in the polyploid. The evolutionary significances of the karyotype repatterning in R. acetocella have been discussed.
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