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

doi:10.7525/j.issn.1673-5102.2017.04.004

Abstract

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

CLC Number:

Q949.758.2

LI Lu, ZHANG Zi-Yuan, KONG Dong-Rui, PENG Hua. Anther and Young Ovule Development in Clematoclethra(Actinidiaceae) with Taxonomic Implications[J]. Bulletin of Botanical Research, 2017, 37(4): 508-513.

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