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Bulletin of Botanical Research ›› 2017, Vol. 37 ›› Issue (5): 651-657.doi: 10.7525/j.issn.1673-5102.2017.05.003

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Study on Embryology of Ulmus pumila L.

ZHENG Jing-Yuan, LI Yun-Zeng, ZHOU Cui-Cui, LU Yun-Shen, WANG Xiu-Hua   

  1. College of Life Science, Northeast Forestry University, Haerbin 150040
  • Received:2017-04-09 Online:2017-09-15 Published:2017-09-15
  • Supported by:
    This study was funded by the college student innovation project of the College of Life Science,Northeast Forestry University.

Abstract: The processes of embryology of Ulmus pumila L. were observed by serial paraffin sections and under optical microscope. The results are as follows: the anther wall of U.pumila L. includes 4 layers; the cytoplasmic division of microspore mother cells during meiosis was simultaneous; the tetrad of microspores resulted from the meiosis are simultaneously bilateral and tetrahedral;mature pollen grains are two-cell type. The development of the anther wall belongs to a dicotyledonous type. Tapetum belongs to glandular tapetum. The ovary consists of 2 carpels with a single locule,parietal placenta,anatropous ovule,double integument,and thick nucellus. The tetrad of megaspores is linear or T-type in arrangement.Embryo sac of U.pumila L. is of single-spore polygonum type. The embryogenesis of U.pumila L. conformed to the So-lanad type; karyotype endosperm; cotyledon embryo without endosperm.

Key words: Ulmus pumila L., embryology, megaspore and microspore, female and male gamete, embryo and endosperm

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