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Bulletin of Botanical Research ›› 2007, Vol. 27 ›› Issue (6): 664-668.doi: 10.7525/j.issn.1673-5102.2007.06.005

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Microsporogenesis and Development of Male Gametophyte in Vitex trifolia var. simplicifolia (Verbenaceae)

WANG Zhong-Li;KONG Dong-Rui;WANG Lei   

  1. College of Life Science,Ludong University,Yantai 264025
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-11-20 Published:2007-11-20
  • Contact: WANG Zhong-Li
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Abstract: The microsporogenesis and development of male gametophyte of Vitex trifolia var. simplicifolia were observed by means of conventional paraffin sections. The main results are as follows: (1) Anther wall comprises epidermis, fibrous endothecium, one middle layer and glandular tapetum with two-nucleate cells. The development of anther wall belongs to dicotyledonous type. (2)There are multicellular glands on the epidermis of anther. (3) Wall thickening occurs in both endothecium and some cells of connective tissue. (4)The tapetum has dual origin: towards outside the tapetum is derived from the primary parietal layer, whereas on the inner side it develops from the cells of the connective. The tapetum is secretory and two-nucleate. (5)Cytokinesis of microsporocyte meiotic division is of simultaneous,and the tetrads are tetrahedral, occasionally isobilateral. (6) The mature pollen grains are two-celled with three colpates.

Key words: Vitex trifolia var. simplicifolia, microsporogenesis, male gametophyte

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