Genome composition, stability and fertility of hexaploid alloploids between Triticum turgidum var. carthlicum and Leymus racemosus

Hexaploid alloploids between the tetraploid wheat Triticum carthlicum and t he perennial tetraploid Leymus racemosus were analysed for chromosome compo sition and cytogenetic stability. GISH analysis showed different lines to h ave from 11 to 16 Leymus chromosomes. The alloploids showed a relatively hi gh frequency of univalents in meiotic metaphase and of aneuploid plants and hence they are not stable. The seedset is lower than in wheat, but high en ough to secure a safe propagation and preservation. The alloploids are disc ussed in relation to widening the genetic variation of breadwheat and wheat breeding.