J Integr Plant Biol. ›› 1998, Vol. 40 ›› Issue (4): -.

• Research Articles •    

The Development of Gynoecium After Anthesis and Fertilization in Eleutherococcus brachypus (Araliaceae)

WANG Zhong-Li, LIU Lin-De, TIAN Guo-Wei and SHENG Jia-Heng   

Abstract: Eleutherococcus brachypus Harms. is a protandrous plant because the female gametophyte delays its maturation until the fifth day after anthesis and pollen shelling. On the fifth day after anthesis, about 57.69% of the embryo sacs matured and the rest degenerated or failed to develop. Fertilization began in the embryo sac on the fifth day. On the tenth day fertilization took place in 53.37 % of the total of embryo sacs. The stigma became receptible after 3 to 4 days of anthesis. It took 2 to 3 days from the germination of pollen grains on stigma to the fusion of male and female nuclei. The process of fertilization in E. brachypus is not different from most other angiosperms. It belonged to the type of premitotic syngamy. The observations and statistical analysis were made on the number feature of male and female nucleoli in the zygote. The result indicated that it took three days or so from the appearance of male nucleolus in the zygote to its fusion with the female nucleotus. Refering to the number of free nuclei of the endosperm, the fusion of male and female nucleoli in most of the zygotes occurred in the stage of 32 to 128 nuclei of the endosperm. Most zygotes con-tained a big nucleolus resulting from the fusion of male and female nucleolus and proceeding to mitosis. A few without fusion could also proceed to the mitotic stage. Features of multiple sperms entering the embryo sac or entering the egg cell and the degeneration of mature embryo sacs were observed as well. The sign of the termination of fertilization in angiosperms was discussed.

Key words: Eleutherococcus brachypus, Development of pistil, Mature embryo sac, Fertilization

Editorial Office, Journal of Integrative Plant Biology, Institute of Botany, CAS
No. 20 Nanxincun, Xiangshan, Beijing 100093, China
Tel: +86 10 6283 6133 Fax: +86 10 8259 2636 E-mail: jipb@ibcas.ac.cn
Copyright © 2022 by the Institute of Botany, the Chinese Academy of Sciences
Online ISSN: 1744-7909 Print ISSN: 1672-9072 CN: 11-5067/Q