IV.7 Reports from coordinators: Desynaptic genes.
J. R. Scheuring and R. T. Ramage. Department of Agronomy and Plant Genetics, University of Arizona, Tucson, Arizona 85721, USA.
Since our report of last year (BGN 4: 123-125), 2 mutants, des,,x and des,,y, have been assigned to a new locus, desl5, and one new mutant, des,,ah, has been collected. To date, 25 mutants, a through y, have been assigned to 15 loci.
Allele tests with des,,x and des,,y have been completed and the mutants found to be allelic to each other and non-allelic to the previously reported 14 loci. They have been assigned to the locus desl5. Last year we reported des,,x and des,,y to be non-allelic. This report was based on what has proved to be an outcross with an unknown parent. Additional crosses between des,,x and des,,y have confirmed their allelism.
The 8 mutants in Klages, z to ag, are allelic to each other and have not yet been assigned to a locus.
A new desynaptic mutant, designated des,,ah, was found in hybrid material that was treated with diethyl sulfate. It displays a medium to high degree of desynapsis. The plant in which des,,ah was found was heterozygous for the translocation T2-7d and for the male sterile gene msg2. Crosses are being made to separate the mutant from the translocation and male sterile gene.