Axial nature of the cupule-bearing organ in Caytoniales
Axial nature of the cupule-bearing organ in Caytoniales作者机构：(Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Nanjing 210008 China) (Fairy Lake Botanical Garden Shenzhen 518004 China)
出 版 物：《Journal of Systematics and Evolution》 (植物分类学报(英文版))
年 卷 期：2010年第48卷第3期
页 面：207-214页
核心收录：
学科分类：09[农学] 0903[农学-农业资源与环境]
基 金：supported by the National Natural Science Foundation of China(Grant Nos.40772006,40632010,and J0630967) the Scientific Research Foundation for Returned Overseas Chinese Scholars,State Education Ministry,China This paper is a conmtribution to International Geological Correlation Progr amme 506
主 题：angiosperms Caytoniales cupule evolution Paracaytonia seed plants systematics Yixian Formation.
摘 要：Caytoniales are an important group of seed plants,and the nature of their female reproductive organ may influence interpretations of the seed plant phylogeny and the origin of *** not convincingly demonstrated by clear evidence,cupules on previously described specimens were interpreted as being distichously arranged,implying that the cupule-bearing organ in Caytoniales was a pinnate *** a female reproductive organ of Paracaytonia hongtaoi *** ***.(Caytoniales)is reported from Liaoning,*** well preserved specimen clearly shows a spiral arrangement of cupules along the reproductive axis,suggesting that the cupule-bearing organ in Caytoniales is not a megasporophyll but a *** new information on the axial nature of the cupule-bearing organ in Caytoniales has significant implications on the placement of Caytoniales in the seed plant phylogeny and interpretation of the relationship between Caytoniales and angiosperms.
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