IDENTIFICATION OF CHROMOSOMES CONTRIBUTING TO ANEUPLOIDY IN HEXAPLOID TRITICALE, CULTIVAR ROSNER

Abstract

Detailed karyotype analyses were conducted on root-tip cells of aneuploid plants of hexaploid triticale, cultivar 'Rosner.' Although complete meiotic stability in this cultivar has not as yet been achieved, it currently represents the standard for triticale improvement in Canada. Rosner characteristically exhibits an average of 0.8 univalents per cell at metaphase I and approximately 10% of its progeny are aneuploid. The results of the present study clearly indicated that both wheat and rye chromosomes of the triticale complement contribute to the aneuploid condition, not primarily those of rye as believed earlier.