禾穀類の幼胚移植に関する研究 : V. 移植幼胚の胚期の生長について

抄録

1. The immature embryos of wheat and barley were excised and immediateiy transplanted into the growing young endosperms of foreign grains. After the operated grains ripened, the transplanted embryos were excised again to measure their size, (length, breadth and thickness). 2. The transplanted young embryo was abie to grow further in the foreign endosperms and reach about the same size as the embryo of intact seed (Table 1). And also, the transplanted embryo was proved to enlarge its size along with the further differentiation of its organs. 3. The increase in length, breadth and thickness of the transplanted embryo was nearly similar, except some embryos which showed surplus growth in breadth or in thicknessf(Table 2). About half of the total number of transplanted e.mbryus grew five times or nlore as large in size as young embryo at the time of excision ; about one-fourth, ten times or more. The earlicr the embryo was tranplanted the larger the growth ratio became (Table 3). 4. The number of embryos longer than 1. 5 mm, which is reported to be able to germinate easily, amounted to about 24 percent of the total number of embryos transplanted. This figure is close to the highest percentage of germinaition (26%), which was obtained in 1956 by the author. 5. These facts indlcate that thc transplanted embryo can take a large amount of nutrition from the host endosperm and continue its normal embryonic growth, so the younger the embryo is the more it depends upon the host endospcrm, and that the transplantcd embryo in the foreign endosperm can grow similarly to that of the embryo in the intact seed In spite of the drastic operation.