Embryology of Crawfurdia delavayi (Gentianaceae) and its systematic value

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	Embryology of Crawfurdia delavayi (Gentianaceae) and its systematic value
	Chen, SL ; He, TN ; Liu, JQ ; Hong, DY
	2000
发表期刊	ISRAEL JOURNAL OF PLANT SCIENCES
卷号	48 期号:2 页码:113-119
文章类型	Article
摘要	The embryological characters of Crawfurdia delavayi Frabnch. are described and the systematic relationships of Crawfurdia discussed. Anthers are tetrasporangiate. The development of anther walls conforms to the Dicotyledonous type. The tapetum is of single origin. The development of the tapetum with uninucleate cells is of the glandular type. The tapetal cells on the connective side show radial elongation or periclinal division and intrude into the anther locule. The epidermis of anther walls persists and its cells become pillar and fibrous, and the endothecium degenerates. The ovary is bicarpellary and unilocular. The placentation is typically parietal with 8 rows of anatropous ovules. The development of embryo sac is of the polygonum type. Before fertilization, two polar nuclei fuse into a secondary nucleus. Three antipodal cells persist. Flowers are protandrous. Fertilization is porogamous. The development of the endosperm is of the nuclear type. The embryogeny corresponds to the solanad type physalis II variation. The embryological data indicate that it is better to separate Crawfurdia from Gentiana as an independent genus.; The embryological characters of Crawfurdia delavayi Frabnch. are described and the systematic relationships of Crawfurdia discussed. Anthers are tetrasporangiate. The development of anther walls conforms to the Dicotyledonous type. The tapetum is of single origin. The development of the tapetum with uninucleate cells is of the glandular type. The tapetal cells on the connective side show radial elongation or periclinal division and intrude into the anther locule. The epidermis of anther walls persists and its cells become pillar and fibrous, and the endothecium degenerates. The ovary is bicarpellary and unilocular. The placentation is typically parietal with 8 rows of anatropous ovules. The development of embryo sac is of the polygonum type. Before fertilization, two polar nuclei fuse into a secondary nucleus. Three antipodal cells persist. Flowers are protandrous. Fertilization is porogamous. The development of the endosperm is of the nuclear type. The embryogeny corresponds to the solanad type physalis II variation. The embryological data indicate that it is better to separate Crawfurdia from Gentiana as an independent genus.
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
学科领域	植物学
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:000088552900007
引用统计	被引频次：6[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/363003/1432
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Peoples R China 2.Chinese Acad Sci, Inst Bot, Lab Systemat & Evolutionary Bot, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Chen, SL,He, TN,Liu, JQ,et al. Embryology of Crawfurdia delavayi (Gentianaceae) and its systematic value[J]. ISRAEL JOURNAL OF PLANT SCIENCES,2000,48(2):113-119.
APA	Chen, SL,He, TN,Liu, JQ,&Hong, DY.(2000).Embryology of Crawfurdia delavayi (Gentianaceae) and its systematic value.ISRAEL JOURNAL OF PLANT SCIENCES,48(2),113-119.
MLA	Chen, SL,et al."Embryology of Crawfurdia delavayi (Gentianaceae) and its systematic value".ISRAEL JOURNAL OF PLANT SCIENCES 48.2(2000):113-119.

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