EVOLUTIONARY ORIGIN OF POA ANNUA L. IN THE LIGHT OF KARYOTYPIC STUDIES

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Abstract
From a karyotype analysis of Poa annua (2n = 28) two large chromosomes, I and II, and one small chromosome, XIV, as well as three chromosome groups containing two, four and five chromosomes have been identified. From a comparison of the karyotype of Poa annua with that published of Poa exilis (2n = 14) and Poa supina (2n = 14), doubt is cast on the theory that Poa annua is an allotetraploid of the two latter diploid species. The three chromosomes of Poa annua that could be identified with certainty existed in homologous pairs, indicating that the species could have originated from Poa exilis or Poa supina and one other hitherto unidentified species. It is suggested that further work on the karyotype of diploid species might reveal further useful information on the evolutionary history of the species.

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