J Integr Plant Biol. ›› 1990, Vol. 32 ›› Issue (7): -.

• Research Articles •    

The Studies on Embryology in Fritillaria ussuriensis Maxim

Li Yu-fen and Shen Jia-heng   

Abstract: The development of the anther wall follows Basic-type. The cytokinesis at the time of pollen mother cell meiosis conforms to successive type. The arrangement of the microspores in the tetrad is referred to isobilateral. The primary wall between the generative cell and the vegetative cell is callose. The callose wall is easily detected under the fluorescence microscope. The mature pollen grain is 2-celled type. The ovule is bitegminous, tenui-nucellar and anatropous. The development of the female gametophyte follows Fritillaria-type. The mature embryo sac. consists of the six cells including the seven nuclei. The fertilization is referred to the premitotic syngamy type. The fusion of the female and male nucleoli is not observed at the end of the fertilization. The division of the primary endosperm nucleus is earlier than that of the zygote. The development of the endosperm is referred to nuclear type. The division of the zygote is transverse of longitudinal, the development of the embryo conforms to Onagradtype. When the seed is mature, the embryo is at the proembryo stage without differentiation and the endosperm cells are not absorbed.

Key words: Fritillaria ussuriensis Maxim., Anther, Pollen, Ovule, Embryo sac of Fritillaria-type, Fertilization, Embryo anl endosperm

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