%0 Journal Article
%A HE Li-Fang
%A PING Jun-Jiao
%A QIAN Gang
%A QIAN Qiu-Bo-Yan
%A WANG Lei
%A WANG Qian-Xing
%A XIE Xin
%T Cytological Features of Gametophyte Development and Zygotic Formation in <i>Senecio scandens</i> Buch.-Ham. ex D.Don(Compositae)
%D 2019
%R 10.7525/j.issn.1673-5102.2019.01.004
%J Bulletin of Botanical Research
%P 27-34
%V 39
%N 1
%X <i>Senecio scandens</i> Buch.-Ham. ex D.Don(Compositae) is a crucial plant source of Chinese traditional medicine with antibacterial properties. To obtain basic knowledge for an insight into its cytology mechanism and further practical breeding application in this species, we focus on characterizing progress on gametophyte developments and zygote formation in this paper. Based on a chronological description of the male gametic development, two dimorphic sperm cells release from their separate position in the male germ unit. Moreover, mature embryo sac exhibits an ovoid to pyriform shape locating at wider micropylar extreme, by following the monosporic pattern on development of embryo sac in the current species. It is therefore reasonable to deduce that the origin of apico-basal polarity of zygotic embryo may be related to an unevenly spaced distribution of cytoplasm in zygotic embryo which results from fertilization between the dimorphic sperm cells and the polar ovule. As the distinguishable characteristics, these morphological features will be usefulness for the taxonomy studies in other Compositae species, including dimorphic sperm cells, polar embryo sac and zygotic polarity.
%U https://bbr.nefu.edu.cn/EN/10.7525/j.issn.1673-5102.2019.01.004