Sporogenesis and gametogenesis in Sladenia and their systematic implication
Li, L; Liang, HX; Peng, H; Lei, LG
AbstractSporogenesis 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 this conclusion. (C) 2003 The Linnean Society of London, Botanical Journal of the Linnean Society, 2003.
KeywordActinidiaceae Anther Wall Development Dilleniaceae Embryology Ericales S.l. Ovule Development Ternstroemiaceae Theaceae S.s.
Subject AreaPlant Sciences
Indexed BySCI
WOS Research AreaPlant Sciences
WOS SubjectPlant Sciences
WOS IDWOS:000186727400008
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Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
AffiliationChinese Acad Sci, Kunming Inst Bot, Kunming 650204, Yunnan, Peoples R China
Recommended Citation
GB/T 7714
Li, L,Liang, HX,Peng, H,et al. Sporogenesis and gametogenesis in Sladenia and their systematic implication[J]. BOTANICAL JOURNAL OF THE LINNEAN SOCIETY,2003,143(3):305-314.
APA Li, L,Liang, HX,Peng, H,&Lei, LG.(2003).Sporogenesis and gametogenesis in Sladenia and their systematic implication.BOTANICAL JOURNAL OF THE LINNEAN SOCIETY,143(3),305-314.
MLA Li, L,et al."Sporogenesis and gametogenesis in Sladenia and their systematic implication".BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 143.3(2003):305-314.
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