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Bulletin of Botanical Research ›› 2017, Vol. 37 ›› Issue (4): 508-513.doi: 10.7525/j.issn.1673-5102.2017.04.004

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Anther and Young Ovule Development in Clematoclethra(Actinidiaceae) with Taxonomic Implications

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

  1. 1. Yunnan Academy of Biodiversity, Southwest Forestry University, Kunming 650224;
    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:2016-12-23 Online:2017-07-15 Published:2017-07-22
  • Supported by:
    Foundation items:the National Natural Science Foundation of China(31260045;31460040);The Key Laboratory for Plant Diversity and Biogeography of East Asia,KIB,Chinese Academy of Sciences(KLBB201203)

Abstract: The anther and young ovule development of the genus Clematoclethra is reported for the first time. This research shows the following embryological features in C.scandens subsp. scandens. It has a six-layered anther wall with a basic type of development, including an epidermis, two middle layers, two glandular tapetum layers, a fibrous thickened endothecium in mature anther. It is characteristic of owning successive cytokinesis during microsporogenesis, tetrahedral tetrads, and 2-celled pollen grains; a unitegmic-tenuinucellate and nearly anatropous young ovule, a micropyle formed by unitegument. The ovule in Clematoclethra is unitegument as well as in both Actinidia and Saurauia, while those of Theaceae family are bitegument. Therefore embryological data supports the viewpoint based on pollen morphology, cytology, and molecular data that Clematoclethra should be grouped into Actinidiaceae, and together with other two genera(Actinidia and Saurauia), constitutes a well-supported monophyly.

Key words: Actinidiaceae, embryology, Clematoclethra, Theaceae, systematics

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