The Addition of Individual Chromosomes of Aegilops squarrosa to Triticum durum

Abstract

A synthetic bread wheat (T. durum cv. Carleton×Aegilops squarrosa) was crossed with T. durum cv. Carleton, the pentaploid F₁ (AABBD; 2n=35) being backcrossed to Carleton. Among the backcross progeny, eight haplosomic (2n=29) groups were identified. Although it was not possible to relate each to a D genome chromosome, four were established as markers of individual chromosomes. One character, brown chaff, appeared to be determined by complementary genes on two chromosomes.
The same characters could be identified among the aneuploids with more than 29 chromosomes and related to particular chromosomes by the isolation of the respective haplosomics.