イネ品種台中65号の同質相互転座系統,RT2-3b・T65に由来する部分的1・3染色体植物の遺伝〔英文〕

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Many abnormal or trisomic-like plants with short culm and lopped leaves segregated in F2 and B1F1 of crosses involving the interchange homozygote RT2-3b·T65. The frequency of appearance of trisomic-like plants was about one quarter of the F2 and B1F1 plants in which the interchange heterozygotes were used as the maternal parent. The further breeding behaviour of the trisomic-like plants was the same as that of the trisomics. Cytological analysis disclosed that the trisomic-like plants were not trisomics; associations of four chromosomes were formed at diakinesis, and the cells at MII contained 12 chromosomes. It was estimated that both male and female gametes of unbalanced type 23-3, which were produced by the adjacent-I disjunction, were functional, and that trisomic-like plants could result from the unbalanced female gamete fertilized by male gamete of one of two balanced types, normal (2-3) and interchanged (23-32). A genetical analysis using two genes, nl1 (neck leaf) on the second chromosome and A (anthocyanin activator) on the third showed that these two loci were closely linked with the breakpoint of RT2-3b·T65. It also showed that most of trisomic-like plants segregated in F2 of the cross between RT2-3b·T65 and the linkage tester T65·nl1 had the nl1+ allele derived from RT2-3b·T65, and all the trisomic-like plants segregated in F2 of the cross between RT2-3b·T65 and T65·A Pn had the A gene from the linkage tester. Combined segregations among these genes, chromosomes and plant types in offspring of trisomic-like plants were reasonably explicable on the basis of the above estimation. It was, then, unequivocal that the trisomic-like plant was partial monosomic for the second chromosome and partial trisomic for the third.
日本遺伝学会の論文

イネ品種台中65号の同質相互転座系統,RT2-3b・T65に由来する部分的1・3染色体植物の遺伝〔英文〕

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