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Bulletin of Botanical Research ›› 2019, Vol. 39 ›› Issue (1): 27-34.doi: 10.7525/j.issn.1673-5102.2019.01.004

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Cytological Features of Gametophyte Development and Zygotic Formation in Senecio scandens Buch.-Ham. ex D.Don(Compositae)

XIE Xin1,2, QIAN Qiu-Bo-Yan3, WANG Lei1, WANG Qian-Xing1, PING Jun-Jiao4, HE Li-Fang2, QIAN Gang1   

  1. 1. Department of Cell Biology, Zunyi Medical University, Guizhou 563003;
    2. Department of Fundamental Nursing, Qiannan Medical College for Nationalities, Duyun 558003;
    3. Undergraduate of 2016, Department of Fundamental Nursing, Qiannan Medical College for Nationalities, Duyun 558003;
    4. Third People Hospital of Zhongshan City, Zhongshan 528400
  • Received:2018-08-16 Online:2019-01-15 Published:2019-01-31
  • Supported by:
    Supported by the National Natural Sciences Foundation of China(31560087);Undergraduate Innovation Fund of Qiannan Medical College for Nationalities(QNYZ201707);Doctoral Fund of Zunyi Medical College(F-809)

Abstract: Senecio scandens 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.

Key words: Senecio scandens, gametophyte, double fertilization, zygote

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