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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
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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 | |
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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