大麦三染色体植物の遺伝学的研究〔英文〕-2-

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Thirty five populations of F2 and 5 of F3 families were tested for disomic and/or trisomic inheritance. In these experiments 10 gene pairs were tested in 6 primary simple trisomic types with the following results:1. Blbl gene pair in 5 trisomic types of Bush, Slender, Pale, Robust, Purple, Brbr pair in Pale, and Rr in Purple and Semi-erect were newly tested for segregation ratios. Only Blbl in Robust and Rr in Semi-erect showed the trisomic ratio while in the others the disomic ratio was observed.2. Out of 35, 27 F2 populations tested in the present experiment showed to agree very well with the previous results obtained from the same combinations (cf. Tsuchiya 1956, 1959): Namely, Nn (III), and Fcfc (VII) in Bush, Vv (I) in Slender and Uzuz (VI) in Pale showed to be fitted very well with the expected trisomic ratio in both the diploid and the trisomic portions. The other showed disomic segregation.3. Segregation of Kk gene pair was tested in 5 F3 families derived from trisomic F2 plants from the Robust×Colsess V cross. The results showed that the egregation of Kk gene pair in both diploid and trisomic portions occurred in the trisomic ratio. Thus, the Robust trisomic for chromosome 4 (Burnhams e) showed to carry the genetic linkage group IV on its extra chromosome.4. From all these findings the relationships between the seven primary simple trisomic, types and the seven known genetic linkage groups of barley have been established (Tables 5 and 6).