Abstract
Short-arm telocentric chromosomes of two Agropyron species, A. glaucum and A. trichophorum, confer nucleus-cytoplasmic compatibility on the alloplasmic common wheat with cytoplasms of these Agropyron species. To determine the homoeologous group of the telocentric Agropyron chromosomes, we studied 1) chromosome pairing in a series of double monosomic-monotelosomic addition plants carrying each one of the two telocentric chromosomes and a single chromosome derived from the closely related species, A. elongatum, 2) in situ hybridization pattern with 18S.26S rDNA in alloplasmic, ditelosomic addition lines, and 3) functional compensation in the alloplasmic, monosomic A. elongatum chromosome addition plants based on plant vigor and selfed seed fertility. Our results showed that the telocentric Agropyron chromosomes belong to the homoeologous group 1.
