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Bulletin of Botanical Research ›› 2019, Vol. 39 ›› Issue (5): 692-698.doi: 10.7525/j.issn.1673-5102.2019.05.007

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Megaspores and Development of Female Gametophyte in Dodonaea viscosa

LU Xue-Jia, LIU Fang-Yan, GAO Cheng-Jie, LI Kun   

  1. The Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming 650224
  • Received:2018-11-26 Online:2019-09-05 Published:2019-07-16
  • Supported by:
    This work was supported by 2017Implementing plan of National Key R&D Program of China(2017YFC0505101);National S&T Plan in the Twelfth Five-Year Period(2015BAD07B0404)

Abstract: In order to know the reason of low natural seed setting rate and the characteristics of embryonic development of Dodonaea viscosa, the megasporogenesis and the development of female gametophyte were observed by using the method of paraffin section. The results were as follows:(1)D.viscosa had style canal and placentation is axial; the he ovary had 3 locules with two ovules per locule; the ovule was amphitropous, bitegmic, crassinucellate and without hypostase. (2)The sporogenous cells located under the epidermis of the nucellus produced sporogenous cells through the pericentric division. The sporoblasts developed into megaspore mother cells, and the megaspore mother cells formed a linear tetrad after meiosis, and 3 megaspore degeneration disappeared near the microspore end. The megaspore developed into functional megaspore and the type of megasporogenesis was monosporogenesis. (3)The mature embryo sac of 7 cells and 8 nuclei was formed by 3 mitosis of uninucleate embryo sac, and the development type of embryo sac was polygonum type. (4)The morphological changes of flower organs were related to the development of megaspore, and the development period of megaspore could be roughly judged according to the morphological characteristics of female flower. The results suggesting that a few abnormal phenomena such as the embryo sac was not empty and the no cellularization of the free nucleus in the development of female gametophyte may be one of the reasons leading to the low natural seed setting rate of D.viscosa.

Key words: Dodonaea viscosa, megaspores, female gametophyte, seed setting rate, abnormal phenomena

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