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Taxonomic and genetic relationships between X-ray induced mutants and the natural forms of barley in the Gatersleben collection


, : Taxonomic and genetic relationships between X-ray induced mutants and the natural forms of barley in the Gatersleben collection. Kulturpflanze 10: 312-334

The former morphological descriptions of 171 mutant lines of 2-rowed spring barley and 3-rowed winter barley were used as the basis for the study. These lines were grouped into "main characters" and incorporated into the morphological system of barley. The 900 mutant lines of the collection were classified in the same way. In general the mutant lines can be arranged into the system without any difficulty, providing that it is agreed to neglect the classification of the monster characters since these are of no importance to the evolution of cultivated barley. Lines in which the mutant character is not used in the present system of classification are placed under the same var. as the original. Lines in which the mutant character is used in the system of classification must be placed under a var. other than the original. The new combinations of characters which originated by mutation could also have arisen by recombination of genes, that is by crosses between well-known forms. In principle, there is genetic correspondence between induced mutants and well-known forms of the world collection. According to these and other studies in several cases morphologically corresponding forms were found to be genetically identical or allelic. It is assumed that there are similar situations in other cases not yet studied. In general, most of the characters which originated by induced mutation are already known from the present diversity of forms, inasmuch as they have no distinctly negative selection value. By experimental induction of mutation only such forms can be produced as have already been created or which are capable of coming into being by evolution. Some related problems of evolution and mutation breeding are discussed.

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