Department of Plant Sciences
University of Arizona
Tucson, AZ 85721, U.S.A.
No new translocations or balanced tertiary trisomics were added to the World Collection last year. The entire collection was grown to increase seed stocks and to maintain viability. Samples from this increase are to be placed in the National Seed Storage Laboratory, Fort Collins, Colorado for long-term storage. Limited amounts of seed of the translocation and balanced tertiary trisomic seed stocks are available upon request.
Linde-Laursen, Risø National Laboratory, Denmark, has reported that T3-5y and T3-5ab are actually T3-7 translocations: "T3-5y" has breakpoints at the centromeres of chromosomes 3 and 7. The rearranged chromosomes combine the long arms of chromosomes 3 and 7 and the short arms of chromosomes 3 and 7. "T3-5ab" has breakpoints in the short arm of chromosome 7 rather near the secondary constriction and rather proximally in the long arm of chromosome 3. The rearranged chromosomes combine the short arm + a proximal segment of the long arm of chromosome 3 with the satellite and a distal part of the short arm of chromosome 7. Further, the larger part of the long arm of chromosome 3 has been translocated to the short arm of chromosome 7 (letter dated December 5, 1985).
We are aware of several other erroneous entries in the World Collection, e.g., T1-2e is not a TI-2 translocation as it gives a ring of 6 plus 4 bivalents when crossed with other T1-2 translocations. We are trying to detect the errors in the Collection and would greatly appreciate any information that would help us.