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Bulletin of Botanical Research ›› 2017, Vol. 37 ›› Issue (4): 499-507.doi: 10.7525/j.issn.1673-5102.2017.04.003

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Anther Development and Microsporogenesis in Dipentodon with Systematic Implications

ZHANG Zi-Yuan1, LIU Xiao-Xiao1, LI Lu1, KONG Dong-Rui2, PENG Hua3   

  1. 1. Yunnan Academy of Biodiversity, Southwest Forestry University, Kunming 650024;
    2. School of Life Sciences, Ludong University, Yantai 264025;
    3. Key Laboratory of Biodiversity and Biogeography of East Asian, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201
  • Received:2016-12-19 Online:2017-07-15 Published:2017-07-22
  • Supported by:
    The National Natural Science Foundation of China(NSFC31260045;NSFC31460040);The Scientific Research Foundation in Southwest Forestry University(2015);College Students Innovative Practice Training Program(2015) in Kunming institute of Botany,Chinese Academy of Sciences

Abstract: The monotypic genus Dipentodon Dunn is endemic to Eastern Asia and has been rare and endangered due to the habitat loss. Its systematic position has been controversial. The investigation in a natural population showed that the average ratio of seed-setting in D.sinicus was very low with a number of 4.31% for three successive years. The anther development and microsporogenesis of D.sinicus were observed by means of conventional paraffin sections. The anther is tetrasporangiate, and its anther wall comprises four or five layers:an epidermis, an endothecium, one or two middle layers and a tapetum. The development of anther wall belongs to basic type. The tapetum is glandular type, and wall thickening occurs in endothecium. Cytokinesis of microsporocyte meiotic division is simultaneous, and the tetrads are tetrachedral, occasionally isobilateral. The mature pollen grains are two-celled with three colpates. The high percentage of pollen abortion was observed in process of male gametogenesis. Comparative embryological features supported the molecular view that Dipentodon should be included into Dipentodentaceae among order Huerteales. The abnormality in the pollen development in Dipentodon might be one of the main causes resulting to its extremely low seed-setting.

Key words: anther development, Dipentodon, microsporogenesis, systematics, rare and endangered species

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