Skip to main content
Article thumbnail
Location of Repository

systematic implication

By L. Li, Lu Li, Han-xing Liang, Hua Peng and Li-gong Lei

Abstract

Sporogenesis and gametogenesis in the monotypic genus Sladenia is reported for the first time. The anther wall is of the monocotyledonous type of formation and consists of four-layers, namely a glandular tapetum, one middle layer, an endothecium, and an epidermis. Fibrous thickenings are developed in the epidermis at or near the stage of anther maturity rather than in the endothecium. Successive cytokinesis in microsporogenesis results in tetrahedral or rarely isobilateral tetrads of microspores. Pollen grains are two-celled when shed. The ovule is bitegmic, tenuinucellate, and anatropous. The nucellus degenerates during meiosis of the megaspore mother cell. The micropyle is formed by only the inner integument. Development of the female gametophyte conforms to the Adoxa type. Sladenia has been treated either as a member of Actinidiaceae, Dilleniaceae or Theaceae s.l., or as belonging to an independent family, Sladeniaceae. Recent molecular studies have suggested that it belongs to Ternstroemiaceae within the Ericales s.l. Several noteworthy embryological characters are distinct from those of the other putatively related families and support the recognition of a separate family, Sladeniaceae. Additional embryological evidence confirms thi

Year: 2002
OAI identifier: oai:CiteSeerX.psu:10.1.1.134.9118
Provided by: CiteSeerX
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://citeseerx.ist.psu.edu/v... (external link)
  • http://www.kib.ac.cn/celea/spo... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.