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Bulletin of Botanical Research ›› 2018, Vol. 38 ›› Issue (2): 182-188.doi: 10.7525/j.issn.1673-5102.2018.02.003

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Sporogenesis and Gametogenesis of Lagerstroemia speciosa

ZHU Li-Qiong, YUAN Juan, WEI Li-Di, WEI Yan-Chun, ZHAO Li-Jun   

  1. College of Forestry, Guangxi University, Nanning 530004
  • Received:2017-07-31 Online:2018-03-15 Published:2018-03-23
  • Supported by:
    National Natural Science Foundation of China(31560061);College student innovation training program of Guangxi University

Abstract: The flower anatomical structures of Lagerstroemia speciosa in different development stages were studied by using method of paraffin section. The formation of the sporophyte and the development process of male and female gametophytes were also surveyed. The results showed that anther has four chambers. The anther wall shows a dicotyledonous type, which be comprised of epidermis, endothecium, middle layer and glandular tapetum. Cytokinesis occurs simultaneously with meiosis in a microspore mother cell, and the formed tetrads are mostly tetrahedral while some are decussate type. The mature pollen grains are of a 3-cell type with three grooves, occasionally aborted. The gynoecium was composed of 6 7 carpels. The ovary has 6 7 locules and there are several anatropous ovules in each locule. The ovules are crassinucellate and bitegmic. The megaspore mother cell divides to a linear megaspore tetrad. The chalazal megaspore develops into a polygonum type embryo sac. The mature embryo sac contains seven cells and eight cell nucleus. The most pollen and embryo sac development are normal, and L.speciosa can be used as a fine female parent in the hybridization breeding. According to the flower morphological characteristics in different blooming phenophase, the process of megaspore and microspore formation and development of male and female gametophytes can be determined initially.

Key words: Lagerstroemia speciosa, sporogenesis, gametogenesis, embryology

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