Abstract
The study involves the chromosomal constitution of advanced progenies of amphidecaploid Avena sativa and A. maroccana. Amphidecaploid 2n=10x=70 was raised from a pentaploid interspecific cross A. sativa×A. magna (Syn. A. maroccana). The selfed progenies of the amphiploid were scored for chromosomal constitution in A14, A15 and A16 generations. It was observed that while there was a general breakdown and loss of chromosomes over the generations, but at the same time stable polysomics with 2n=44, 46, 50, 52, 54, 60, 62, 64, 66 and 68 were isolated together with progenies having female parent number of 2n=6x=42 (A. sativa) and original decaploid number of 2n=10x=70. No progenies with less than 2n=6x=42 were recovered, although male parent happens to be a tetraploid with 2n=4x=28. A general reduction in the number of multivalents and consequent increase in bivalent configurations was observed from A0 to A16 generations.
