Embryology of Crawfurdia delavayi (Gentianaceae) and its systematic value

NWIPB OpenIR

	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 ; Chen SL, He TN, Liu JQ, Hong DY.Embryology of Crawfurdia delavayi (Gentianaceae) and its systematic value.ISRAEL JOURNAL OF PLANT SCIENCES,2000,48(2):113-119
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.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/35651
专题	中国科学院西北高原生物研究所
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, Chen SL, He TN, Liu JQ, Hong DY.Embryology of Crawfurdia delavayi (Gentianaceae) and its systematic value.ISRAEL JOURNAL OF PLANT SCIENCES,2000,48(2):113-119,2000.
APA	Chen, SL,He, TN,Liu, JQ,&Hong, DY.(2000).Embryology of Crawfurdia delavayi (Gentianaceae) and its systematic value.ISRAEL JOURNAL OF PLANT SCIENCES.
MLA	Chen, SL,et al."Embryology of Crawfurdia delavayi (Gentianaceae) and its systematic value".ISRAEL JOURNAL OF PLANT SCIENCES (2000).