小麦の稔実に関する研究 : 第1報 胚乳形成初期の発生学的観察

抄録

The early period of endosperm development in 6 wheat varieties under constant temperature conditions, at 10°, 20°, and 30°C were observed. The development began by the division of primary nucleus and passing through 2, 4, 6, 8, ·········nucleate stages the peripheral layer was formed (Figs. 1∼20) Throughout these periods the increasing nuclei were arranged regularly in the embryo sac cavity. In 12∼16 nucleate stage, 4 nuclei closely surrounded the zygote, and then cleavage of the fertilized egg was started. Cytoplasm around the endosperm nuclei increased in volume accompanying with the progress of nuclear divisions. On the other hand, antipodal cells which were contacted with the endosperm nuclei showed a remarkable degeneration. These suggest that the antipodals may give the nutritional cotribution to the early development of the endosperm, and the latter may have a influence upon the division of the zygote and subsequent development of the proembryo.