Supplementary description of Cycas hongheensis (Cycadaceae) from Yunnan, China and its phylogenetic position

doi:10.11646/phytotaxa.257.1.5

	Supplementary description of Cycas hongheensis (Cycadaceae) from Yunnan, China and its phylogenetic position
	Liu, Jian 1,2; Lindstrom, Anders J.3; Gong, Xun1
	2016-04-14
发表期刊	PHYTOTAXA
卷号	257 期号:1 页码:71-80
摘要	Cycas hongheensis was firstly proposed as a distinct taxon in 1994 and formally described two years later based on vegetative materials only. Here, the reproductive organs of this species, namely, the female cone, male cone and seeds are supplemented for description as these fertile materials were found for the first time at the type locality. Furthermore, the phylogenetic position of this species as being the only endemic member of Cycas sect. Indosinenses in China was investigated. The conflicting phylogenic results between chloroplastic (cpDNA) and nuclear DNA (nDNA) are corresponded with the inconformity characters of morphology of this species. The characters of lacking indumentum on ovules and the distinct apical spine of megasporophyll are corresponding to nDNA result while the characters such as the soft and rudimentary apical spine of the microsporophyll and the absence of fibrous layer inside the sarcotesta comform to cpDNA result. For the taxonomy, we agree this species to be classified into Cycas sect. Indosinenses for the obvious morphological characters of megasporophyll and ovule as well as deeper evidence from phylogeny based on nuclear data, as biparental inherited nuclear genes could offer more comprehensive genetic information than maternal inherited cpDNA.
关键词	Cycas Sect. Indosinenses Megasporophyll Pollen Cones Southwestern China
DOI	10.11646/phytotaxa.257.1.5
收录类别	SCI
语种	英语
WOS记录号	WOS:000381806500005
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/28580
专题	中国科学院东亚植物多样性与生物地理学重点实验室
作者单位	1.Chinese Acad Sci, Key Lab Plant Divers & Biogeog East Asia, Kunming Inst Bot, Kunming 650201, Yunnan, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Nong Nooch Trop Bot Garden, Sattahip 20250, Chon Buri, Thailand
推荐引用方式 GB/T 7714	Liu, Jian,Lindstrom, Anders J.,Gong, Xun. Supplementary description of Cycas hongheensis (Cycadaceae) from Yunnan, China and its phylogenetic position[J]. PHYTOTAXA,2016,257(1):71-80.
APA	Liu, Jian,Lindstrom, Anders J.,&Gong, Xun.(2016).Supplementary description of Cycas hongheensis (Cycadaceae) from Yunnan, China and its phylogenetic position.PHYTOTAXA,257(1),71-80.
MLA	Liu, Jian,et al."Supplementary description of Cycas hongheensis (Cycadaceae) from Yunnan, China and its phylogenetic position".PHYTOTAXA 257.1(2016):71-80.

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