II.29 Mutations for seedling lethality on chromosome 2.
R.T. Ramage and J.M. Jones. Department of Plant Science, University of Arizona, Tucson, Arizona 85721, U.S.A "R"
Last year (BGN 5:44-45) we reported the induction of a large number of mutants for seedling lethality on chromosome 2 closely linked in coupling with the male sterile allele, msg2. We also reported that allele tests had established the existence of at least four loci in the mutant collection and that three of the mutants had been established in BTT form. The three mutants in BTT form had not been allele tested with each other. This communication reports progress made during the past year in allele testing to determine the number of loci involved in the mutant collection.
To date, we have identified 8 loci conditioning albino seedling. To the locus that has been symbolized alb,,p (Rahman and Eslick, BGN 6:53-58) we have assigned 11 of our mutants: 77, 128, 369, 410, 412, 482, 548, 632, 601, 776 and 801. The mutant 369 has been established in BTT form. To another locus, we have assigned 8 mutants: 15, 26, 88, 106, 140, 143, 226, and 797. The mutant 143 has been established in BTT form. To a third locus, we have assigned 4 mutants: 360, 461 634 and 725 and to a fourth locus we have assigned the mutants 526 and 583. We have found a single mutant at each of four other loci: 40, 58, 237 and 253. The mutant 253 has been established in BTT form.
In summary, we have identified 8 loci conditioning albino seedling that are closely linked with the male sterile locus, msg2, on chromosome 2. Mutants at three of the loci have been established in tertiary trisomics that are balanced for both the albino seedling and the male sterile, msg2, alleles. Limited amounts of seed of the mutants and of the BTT lines are available upon request.