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	Provedor de dados 16 (1) 48 (1) Autor Ao, C. (1) Cao,Lingling (1) Gan,Xiaohong (1) Xie,Dan (1) Palavra-chave Sporogenesis (2) Anther wall (1) Development of gametophytes (1) Gametogenesis (1) Natural regeneration (1) Sect. Platyspermum (1) Sect. Tripterospermum (1) Systematic values (1) Tetracentron sinense Oliv (1) Tripterospermum chinense (1) Mais... Tipo do documento Article / Letter to the editor (1) Journal article (1) Ano 2012 (2) País Chile (1) Netherlands (1) Idioma Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Sporogenesis and development of gametophytes in an endangered plant, Tetracentron sinense Oliv 48 Gan,Xiaohong; Xie,Dan; Cao,Lingling. The sporogenesis and development of gametophytes in Tetracentron sinense Oliv. were studied with light microscopy. The anther has four microsporangia; its primary anther wall consists of an epidermis, an endothecium, one or two middle layers and one glandular tapetum. Simultaneous cytokinesis follows meiosis, forming a tetrahedral tetrad. Mature pollen grains are two-celled at the time of anther dehiscence. Its ovule is anatropous, bitegmic and crassinucellate; the development of the female gametophyte is of the monosporic 8-nucleate Polygonum type. Significantly, some striking features were first found in T. sinense: (1) anther dehiscence occurs soon after the endothecium fibrously thickens and the intersporangial septum degenerates; (2) tapetum... Tipo: Journal article Palavras-chave: Tetracentron sinense Oliv; Sporogenesis; Development of gametophytes; Natural regeneration. Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000400011 Anther wall formation, sporogenesis and gametogenesis of Tripterospermum chinense (Gentianaceae), with emphasis on uniformity of characters in Tripterospermum and its systematic values 16 Ao, C.. Tripterospermum sensu T.N.Ho comprises two sections that are readily discriminated morphologically. In the present paper, embryological characters in anther wall formation, sporogenesis and gametogenesis of Tripterospermum chinense, a member of sect. Platyspermum, are reported. Comparisons based on available data show that as far as the two recognized sections are concerned, embryological characters are uniform in all aspects, disapproving of the splitting of the genus into two sections. The notable differences between Tripterospermum and closely related genera support the phylogenetic conclusion that Tripterospermum is monophyletic. Tipo: Article / Letter to the editor Palavras-chave: Anther wall; Gametogenesis; Sect. Platyspermum; Sect. Tripterospermum; Sporogenesis; Systematic values; Tripterospermum chinense. Ano: 2012 URL: http://www.repository.naturalis.nl/record/525218 Registros recuperados: 2 Primeira ... 1 ... Última

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