大麦のトリゾミックに関する研究〔英文〕-2-

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The hybrids between primary trisomic types and a set of Burnhams translocation testers were investigated to identify the extra chromosomes. A configuration of 1V+5II indicated that the extra chromosome in the trisomic was one of those involved in the interchange whereas 1IV+1III+4II indicated that it was not involved in the interchange. The results obtained in the present investigation are as follows:1. The independence of the seven primary simple trisomic types of barley obtained from autotriploid plants of H. spontaneum var. transcaspicum was confirmed by a cytological study.2. The extra chromosome in each trisomic type was identified in terms of the letter designations a to g as used by the American workers.3. Completion of the cytological identification of the chromosomes designated by the different letters from a to g now makes it possible to have one numbering system for the linkage groups and the chromosome numbers (Ramage, Burnham and Hagberg 1961).4. The trisomic types, the chromosomes, and the linkage groups are now given by one series of Arabic numbers from 1 to 7 (Table 3) following the final morphological identification by Hagberg of the three longer chromosomes in relation to the letter designations (Ramage, Burnham and Hagberg 1961).
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