Abstract
Three sorts of chromosomal variations, loss of satellite, cytomixis and translocation, were observed in hybrids between different natural populations of Avena canariensis. A heteromorphic rod bivalent is frequently found in the hybrids between early and late flowering ecotypes of A. canariensis and one satellite chromosome has been lost in the early flowering ecotype of Lanzarote Island. Cytomixis was observed in a number of inter-population hybrids, and one genotype was shown to induce cytomixis causing a great loss of chromatin. The plants showing cytomixis were 70-80% fertile but cytomixis was considered to be an isolating mechanism. A quadrivalent (or trivalent) caused by a single reciprocal translocation was observed in the populations which originated from a distinct geographic region i.e. the northern part of Lanzarote.
