Nitrogen mustard によるショウジョウバエの Phenocopy 誘發について
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概要
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Larvae of Drosophila melanogaster of Oregon stock, kept at 25℃ and aged from 40 to 100 hours, were exposed for 1 hour to a 2% solution of nitrogen mustard CH_3・N (CH_2・CH_2Cl)_2 HCl usually at 16℃. Although a few experimental individuals revealed abnormalities in their antenna, proboscis or legs, almost all of the phenocopies that appeared were those of eyes, i. e., Bar of eyeless (Fig. 1). Some specimens showed abnormalities in wings, i. e., notchy or incomplete (Fig. 2). The phenotypies of these abnormal flies were, in the majority of cases, an asymmetry between their right and left sides, likewise as in the case of Bodenstein and Abdel-Malek ('49) except for the point that in their case with D. virilis a great many aristapedia was reported to have appeared. As shown in Table 1 and Fig. 3, it is obvious that the peak of the effect appears in the vicinity of 70 hours of age (24.2% of flies were Bar), and also that there are fairly sharpdecreases shortly before and after this point. The sharp decrease of the frequency observed between 70 to 80 hours or so. In fact, the result of another experiment of ligature leads us to the same conclusion; that the pupal determination takes place in 81 to 84 hours of age. The frequency of the effect is also low during 40 to 60 hours of age, and becomes higher from about 65 hours. This difference is, as we assume, due to the difference in the competence of the imaginal discs. The results of experiments performed at 16℃ are displayed in Table 1. Moreover, when the larvae were treated at 30℃, very few flies emerged (14.0%), although the rate of induction of Bar was almost the same. Bar flies were treated of their heredity, but no Bar nor other abnormal flies appeared from the progeny. Therefore we conclude the Bar that appeared in the treatedispecimens is one of the phenocopies.
- 社団法人日本動物学会の論文
- 1951-12-15
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