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Bulletin of Botanical Research ›› 2018, Vol. 38 ›› Issue (2): 212-217.doi: 10.7525/j.issn.1673-5102.2018.02.007

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Mega-and Microsporogenesis and Development of Female and Male Gametophytes in Michelia maudiae Dunn

XIONG Hai-Yan, LIU Zhi-Xiong   

  1. College of Horticulture and Gardening, Yangtze University, Jingzhou 434025
  • Received:2017-09-27 Online:2018-03-15 Published:2018-03-23
  • Supported by:
    Project supported by National Natural Science Foundation of China(31101202)

Abstract: The mega-and microsporogenesis and development of female and male gametophytes in Michelia maudiae Dunn were investigated by using the paraffin section method. Anthers are tetradymous and the anther wall is composed of 5-7 layer of cells, Glandular tapetum, Cytokinesis in meiosis is modified simultaneous type, the tetrads are tetrahedral, isobilateral and decusate. Mature pollen grains are 2-cell type. The ovule of M.maudiae is anatropous bitegmic and nucellus thickly. The megaspore mother cells undergo meiosis divides into linear type tetrads, and the one in the chalazal end is functional, Polygonum type. The female and male gametophytes in spring-flowering M.maudiae were developed normally, heterogamy. The megaspore mothercells formed after the petals and stamen were withered. The development of microspore in autumn is in the period of sporozoic cell or primary spore, abortionthen. Megaspore in autumn-flowering M.maudiae undeveloped when flowering, withers away after flowering, were mostly developed unnormally. The study had accumulated information on the reproduction and hybridization in M.maudiae Dunn.

Key words: Michelia maudiae Dunn, mega-and microsporogenesis, female and male gametophytes

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