TB-4Lb and TB-5Sc, two new B-A translocations on the long arm of chromosome 4 and the short arm of chromosome 5

TB-4Lb and TB-5Sc, two new B-A translocations on the long arm of chromosome 4 and the short arm of chromosome 5

TB-4Lb, a new B-A translocation on the long arm of chromosome 4, was produced by crossing a c2 tester by pollen from colored, B chromosome-carrying plants that had been x-rayed (3 minutes at 200 r/min.) as described by Lin (NL 46:193). The genes gl4, gl3, c2 and dp are distal to the breakpoint; other genes on the arm have not yet been tested.

By using the same procedure with a2 instead of c2, a new B-A translocation on the short arm of chromosome 5 has been produced. It is hereby designated TB-5Sc. Both a2 and gl17 are beyond the breakpoint; other genes on the arm will be tested to determine their position with respect to the breakpoint of the translocation.

J. B. Beckett

Please Note: Notes submitted to the Maize Genetics Cooperation Newsletter may be cited only with consent of the authors.

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