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题名: Embryology of Swertia (Gentianaceae) relative to taxonomy
作者: Xue, Chun-Ying; Ho, Ting-Nong; null(李德铢)
刊名: BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
关键词: development ; embryogenesis ; megagametogenesis ; microgametogenesis ; phylogeny ; Swertia erythrosticta ; Swertia franchetiana ; Swertia tetraptera ; Swertiinae
英文摘要: 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.
出版日期: 2007-11-01
卷号: 155, 期号:3, 页码:383-400
语种: 英语
收录类别: SCI
学科分类: Plant Sciences
ISSN号: 0024-4074
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/2775
Appears in Collections:中国科学院东亚植物多样性与生物地理学重点实验室_期刊论文

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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

Recommended Citation:
Xue, CY; Ho, TN; Li, DZ.Embryology of Swertia (Gentianaceae) relative to taxonomy,BOTANICAL JOURNAL OF THE LINNEAN SOCIETY,2007,155(3):383-400
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