イモリ幼生へのヒキガエル肢芽移植によって生じた誘導肢の側性
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概要
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A hindlimb bud of Bufo vulgaris was transplanted to young larvae of Triturus pyrrhogaster with the purpose of studying the factors governing the laterality of the homoiogenetically induced limb. The graft at stages 1.5/1 to 2/1 was placed on the mid-flank (location M) or to the site just anterior to the normal hindlimb (location Pa) of the host at stages 44 to 45. The orientation of the graft was aa・dd as well as ap・dd. The transplanted anuran limb bud did not develop well on the host, and about half of them were resorbed completely, whereas in some favourable cases (25 per cent) the skelton with every piece of cartilage differentiated in its interior, and its laterality could be determined. Since most of the induced limbs obtained in the location M as well as in the location Pa were well differentiated hindlimbs, both locations may be jugded as belonging to the hindlimb field. According to Oka ('43, '52), the laterality of the induced limb in each limb field is determined principally by the relative position of that limb to the transplant and to the normal host limb, but no relation was found between the side of transplant on which the induced limb was formed and the orientation of the transplant. Although Oka's rules were established on the results obtained in the region adjacent to the normal host limb, where the supernumerary limb formation by the shifting of the normal limb material might be possible (Humphrey, '33; Takaya, '41; Usui, '51), the results of the present experiment showed that his rules also hold true to the laterality of the induced limb at the mid-flank region, far from the host normal limbs. In the present work, however, a close relation was obserbed between the relative position of the induced limb to the transplant and the orientation of the transplant. Thus, in the aa・dd-transplantations the induced limbs occurred on the caudal side of the transplant, i.e., between the transplant and the normal hindlimb, and they were disharmonic (polarity: ap. dd); in the ap. dd-transplantations the induced limbs were formed at the site cranial to the transplant, i.e., on the oposite side of the transplant as seen from the host hindlimb, and they were harmonic (polarity: aa. dd), Attention may be called to the fact that thses relations were seen even when the graft had been resorbed completely. For the difference between Oka's results and those of the present work concerning the relation between the position of the induced limb and the orientation of the transplant, it is likely that the fact, that the graft in the present work advanced slightly in age in comparison with those used in Oka's experiment, is responsible.
- 社団法人日本動物学会の論文
- 1961-05-15
著者
関連論文
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