IV. 11. Coordinator's Report: Translocations and balanced tertiary trisomics.
R.T. Ramage, Department of Plant Sciences, University of Arizona, Tucson Arizona 85721, U.S.A.
One translocation, T2-5ac, was added to the World Collection last year. T2-5ac is in "Mutant 56" which is an induced high lysine mutant in Carlsberg II. The translocated chromosomes in T2-5ac consist of 2L-5L and 2S-5S, the break-points being in the centromeres or very close to them in the short arm of chromosome 2 and the long arm of chromosome 5 (Linde-Laursen and Olsen, 1976). The location of the break-points was confirmed by Linde-Laursen (198) using Giemsa C-banding.
Linde-Laursen (1984) used Giemsa C-banding to assign breakpoints of 26 translocations to chromosome arms. This technique verified or revised the locations of break-points that had been established by other methods.
Limited amounts of seed of the translocations and balanced tertiary trisomics in the collection are available upon request.
References:
Linde-Laursen, I, and O.A. Olsen. 1976. Identification of an interchange between chromosomes 2 and 5 in Riso mutant 56--a high lysine line. BGN. 6:43-44.
Linde-Laursen, I. 1984. Break-points localized to chromosome arm or region in 26 translocation lines of barley using Giemsa C-banding. BGN. 14:12-13.