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Originally published as Genetics Published Articles Ahead of Print on October 22, 2006.
Genetics, Vol. 174, 1755-1765, December 2006, Copyright © 2006
doi:10.1534/genetics.106.065540
Construction and Uses of New Compound B-A-A Maize Chromosome Translocations
William F. Sheridan*,1 and
Donald L. Auger
* Department of Biology, University of North Dakota, Grand Forks, North Dakota 58202-9019 and Department of Biology and Microbiology, South Dakota State University, Brookings, South Dakota 58007-2142
1 Corresponding author: Biology Department, University of North Dakota, Starcher Hall, Room 101, Grand Forks, ND 58202-9019.
E-mail: bill.sheridan{at}und.edu
Maize B-A translocations result from reciprocal interchanges between a supernumerary B chromosome and an arm of an essential A chromosome. Because of the frequent nondisjunction of the B centromere at the second pollen mitosis, B-A translocations have been used to locate genes to chromosome arms and to study the dosage effects of specific A segments. Compound B-A translocations (B-A-A translocations) are created by bringing together a simple B-A translocation with an A-A translocation in which breakpoints in the A-A and B-A translocations are in the same arm. Recombination in the region of shared homology of these A chromosome segments creates a B-A-A translocation. Success in creating and testing for a new B-A-A translocation requires that the B-A translocation be proximal to the A-A translocation and that the A-A translocation be proximal to the tester locus. The breakpoints of most of the A-A translocations have been cytologically defined by earlier investigators. Previous investigators have produced 16 B-A-A translocations and one B-A-A-A translocation, which collectively define 35 A chromosome breakpoints. We have enlarged this group by creating 64 new B-A-A translocations. We present a summary of the total of 81 B-A-A translocations showing their distribution among the chromosome arms and the 163 cytologically defined chromosome segments delimited by them. We also illustrate the method of construction of these B-A-A stocks and their uses.
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