Embryology of Swertia (Gentianaceae) relative to taxonomy

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	Embryology of Swertia (Gentianaceae) relative to taxonomy
	Xue, Chun-Ying ; Ho, Ting-Nong ; Li, De-Zhu
	2007-11-01
发表期刊	BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
卷号	155 期号:3 页码:383-400
文章类型	Article
摘要	The embryological features of three species of Swertia (s.l.) - S. erythrosticta, S. franchetiana, and S. tetraptera were characterized, and the observations were used, together with previously gathered data on other species, to evaluate a recently proposed polyphyly, based on molecular data, of Swertia s.l. Comparisons of species within the genus showed that they have diversified embryologically, and there are significant between-species differences. Notable features that vary between species include the number of cell layers that form the anther locule wall, the construction of the wall of the mature anther, tapetum origin, the cell number in mature pollen grains, the structure of the fused margins of the two carpels, the ovule numbers in placental cross-sections, the shape of the mature embryo sac, the degree of ovule curvature, antipodal variation and the presence of a hypostase, and seed appendages. They share characters that are widely distributed in the tribe Gentianeae, such as a dicotyledonous type of anther wall formation, a glandular tapetum with uninucleate cells, simultaneous cytokinesis following the meiosis of the microsporocytes, tetrahedral microspore tetrads, superior, bicarpellary and unilocular ovaries, unitegmic and tenuinucellar ovules, Polygonum-type megagametophytes, progamous fertilization, nuclear endosperm, and Solanad-type embryogeny. The presence of variation in embryological characters amongst the species of Swertia s.l. strongly supports the view that Swertia s.l. is not a monophyletic group. Frasera is better separated from Swertia s.l. as an independent genus, and is only distantly related to Swertia s. s. judging from the numerous differences in embryology. Swertia tetraptera is very closely related to Halenia, as they show identical embryology. (C) 2007 The Linnean Society of London, Botanical Journal of the Linnean Society, 2007, 155, 383-400.; The embryological features of three species of Swertia (s.l.) - S. erythrosticta, S. franchetiana, and S. tetraptera were characterized, and the observations were used, together with previously gathered data on other species, to evaluate a recently proposed polyphyly, based on molecular data, of Swertia s.l. Comparisons of species within the genus showed that they have diversified embryologically, and there are significant between-species differences. Notable features that vary between species include the number of cell layers that form the anther locule wall, the construction of the wall of the mature anther, tapetum origin, the cell number in mature pollen grains, the structure of the fused margins of the two carpels, the ovule numbers in placental cross-sections, the shape of the mature embryo sac, the degree of ovule curvature, antipodal variation and the presence of a hypostase, and seed appendages. They share characters that are widely distributed in the tribe Gentianeae, such as a dicotyledonous type of anther wall formation, a glandular tapetum with uninucleate cells, simultaneous cytokinesis following the meiosis of the microsporocytes, tetrahedral microspore tetrads, superior, bicarpellary and unilocular ovaries, unitegmic and tenuinucellar ovules, Polygonum-type megagametophytes, progamous fertilization, nuclear endosperm, and Solanad-type embryogeny. The presence of variation in embryological characters amongst the species of Swertia s.l. strongly supports the view that Swertia s.l. is not a monophyletic group. Frasera is better separated from Swertia s.l. as an independent genus, and is only distantly related to Swertia s. s. judging from the numerous differences in embryology. Swertia tetraptera is very closely related to Halenia, as they show identical embryology. (C) 2007 The Linnean Society of London, Botanical Journal of the Linnean Society, 2007, 155, 383-400.
关键词	Development Embryogenesis Megagametogenesis Microgametogenesis Phylogeny Swertia Erythrosticta Swertia Franchetiana Swertia Tetraptera Swertiinae
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
学科领域	植物学
关键词[WOS]	L. GENTIANACEAE ; GENTIANINAE ; ANGIOSPERMS ; PHYLOGENY ; FITNESS ; NUCLEAR ; IMPACT ; DNA
收录类别	SCI
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000250644600007
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/1251
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Biodivers & Biogeog, Kunming 650204, Yunnan, Peoples R China 2.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Qinghai, Peoples R China
推荐引用方式 GB/T 7714	Xue, Chun-Ying,Ho, Ting-Nong,Li, De-Zhu. Embryology of Swertia (Gentianaceae) relative to taxonomy[J]. BOTANICAL JOURNAL OF THE LINNEAN SOCIETY,2007,155(3):383-400.
APA	Xue, Chun-Ying,Ho, Ting-Nong,&Li, De-Zhu.(2007).Embryology of Swertia (Gentianaceae) relative to taxonomy.BOTANICAL JOURNAL OF THE LINNEAN SOCIETY,155(3),383-400.
MLA	Xue, Chun-Ying,et al."Embryology of Swertia (Gentianaceae) relative to taxonomy".BOTANICAL JOURNAL OF THE LINNEAN SOCIETY 155.3(2007):383-400.

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