イモリの發生に對する鹽化リチウムの影響について : 1.發生段階と作用時間

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Systematic experiments on the effects of lithium chloride upon the embryo of Triturus pyrrhogaster had not been carried out. We attempted preliminary studies on this subject using 1/(300) lithium chloride aqueous solution at 23℃. 1) Upon exposing the embryos for about twenty hours to the solution, they were affected in various stages ranging from blastula to the early neurula. The embryos in stages prior to the blastula were not affected unless they were exposed a longer time, and after the middle neurula stage the embryos did not produce any appreciable deformities regardless of the longer treatment. 2) The mesodermization of the notochordal material took place through twenty hours treatment only when the blastula and gastrula embryos were exposed to the solution, and it occurred more caudally with advance of development. In the early neurula stage the effect was limited to the head region. 3) The early and late gastrula embryos produced the head deformity after exposing them to lithium chloride solution for about five and three hours respectively, but in early neurula two hours of exposure proved to be sufficient. That is, it may be said that the prechordal plate in early neurula is most susceptible to lithium chloride. From (2) and (3) I share Lehmann's view that the effect on the embryo is phase-specific. 4) The fact that with the appearance of the most susceptible phase, the prechordalplate is more delayed than that with posteriorly situated notochordal material, seems to oppose Child's anteroposterior development theory (Lehmann, 1937). This, however, may be apprehensible if we regard that the archenteron roof has differentiated into two regions, i.e., prechordal plate and notochordal region, and they already belong to different gradient-field systems. 5) In regions, where the vigorous mesodermization of the notochordal material took place, the formation of the neural tube did not occur and only the mesoectodermal cells were observed. This may be due to the decrease of the inducing capacity of the mesodermized notochord.
社団法人日本動物学会の論文
1951-03-15

イモリの發生に對する鹽化リチウムの影響について : 1.發生段階と作用時間

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