Supplementary description of Cycas hongheensis (Cycadaceae) from Yunnan, China and its phylogenetic position
Liu, Jian1,2; Lindstrom, Anders J.3; Gong, Xun1
2016-04-14
Source PublicationPHYTOTAXA
Volume257Issue:1Pages:71-80
AbstractCycas 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.
KeywordCycas Sect. Indosinenses Megasporophyll Pollen Cones Southwestern China
DOI10.11646/phytotaxa.257.1.5
Indexed BySCI
Language英语
WOS IDWOS:000381806500005
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Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/28580
Collection中国科学院东亚植物多样性与生物地理学重点实验室
Affiliation1.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
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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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