VARIATION IN THE TRANSMISSION OF UNIVALENT CHROMOSOMES FROM PENTAPLOID WHEAT HYBRIDS

Abstract

Univalent transmission was studied in aneuploids from pentaploid (AABBD) wheat hybrids. Two groups of such hybrids were used: one group carried heterozygous AABB chromosome complements derived from crosses between T. aestivum cv. Chinese Spring monosomics XV-XXI and T. durum, cvs. Nursi and Samara, 2n = 28; the second group had homozygous AABB complements and came from crosses between the amphiploid (T. durum cv. Carleton × Aegilops squarrosa) and T. durum cv. Carleton. The transmission of univalent D chromosomes was markedly reduced when most of the AABB chromosome complement was derived from T. durum.