Abstract
TRUE-BREEDING diploid mutants have been found to arise from colchicine-treated Sorghum seedlings of the true-breeding lines, Experimental 1 and Experimental 3 1–5. Their true-breeding nature is similar to that obtained after many generations of selfing so that they appear to be immediately homozygous for the new characteristics. Some non-true-breeding mutants also occur. It was proposed that the true-breeding condition might arise by a somatic reductional division of the chromosomes, similar to that observed by Huskins6, with subsequent restoration to the diploid number, and that the mutant condition might arise through concentration of chromatin from one of the original ancestors from which Experimental 3 had been derived. However, from cytogenetic studies of hybrids between true-breeding mutants and their untreated full sibs, the genetic changes appear to be due to gene mutations4,7–9. Tests of the somatic reduction hypothesis using chromosome markers (recessive genes and reciprocal translocations) in the heterozygous condition in sorghum and other materials have not been decisive1,7,10 except for one case in flax (gene markers) which indicated its seeming validity11.
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References
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FRANZKE, C., SANDERS, M. & ROSS, J. Influence of Light from an Infra-red Bulb on the Mutagenic Effect of Colchicine on Sorghum . Nature 188, 242–243 (1960). https://doi.org/10.1038/188242a0
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DOI: https://doi.org/10.1038/188242a0
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