A study of Avena macrostachya

Abstract

The morphology, distribution, developmental and reproductive behaviour, cytology, and glumes' epicuticular waxes of Avena macrostachya, a long overlooked species, have been studied and described. In addition, a few interspecific crosses have been attempted but were unsuccessful. Based on unique traits, such as perenniality, cross-fertilization, and quadrivalent-forming autotetraploidy (2n = 4x = 28), it was found to have an isolated position in Avena. It was concluded, however, that at present there is no strong reason to exclude it from the genus. Because of its unique traits, this species may be particularly important in breeding programs when the nature of its reproductive isolation barriers is understood.