THE CYTOGENETIC POSITION OF AVENA PROSTRATA AMONG THE DIPLOID OATS

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Abstract
The chromosome architecture of the newly discovered diploid oat A. prostrata is similar to that of A. longiglumis. The hybrids involving these oats had many PMC's with seven bivalents and were partially fertile. Considerable restoration of fertility in the F2 was coupled with improvement of chromosome pairing and usually linked to the diagnostic morphological characters of either parent. The hybrids involving A. prostrata and A. strigosa were characterized by multivalent associations in meiosis, indicating at least five translocation differences between the two species. By combining the cytogenetical, morphological and the ecological evidence, it was suggested that A. prostrata is either the first evolutionary step from A. longiglumis toward A. damascena and A. strigosa or, more probably, the common ancestor of these three diploid oats.

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