Abstract
We have analyzed the C-banding karyotypes, electrophoretic mobility of isozymes and seed proteins, total genomic DNA hybridization and chloroplast DNA ofAristavena setacea, Deschampsia cespitosa, D. media, Avenella flexuosa andA. stricta, which had been previously considered as belonging to the genusDeschampsiaBeauv. s. l., in order to determine their taxonomic relationships. The results obtained with these different approaches indicate thatAvenella diverges substantially in all characters analyzed from the other two genera. No differences in six chloroplast DNA segments analyzed were found betweenAristavena andDeschampsia, which also show a level of total genomic DNA hybridization that indicates a relatively high proportion of common sequences. The closer relationship of these two genera contrasts with their divergence in karyotype structure that suggests a possible allopolyploid origin ofDeschampsia.
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