Floral structure and ontogeny of Syndiclis (Lauraceae)

doi:10.3389/fpls.2017.01225

	Floral structure and ontogeny of Syndiclis (Lauraceae)
	Zeng, Gang 1; Liu, Bing ; Ferguson, David K.; Rohwer, Jens G.; Yang, Yong
	2017
发表期刊	PLOS ONE
ISSN	1932-6203
卷号	12 期号:10
摘要	Generic delimitation in the Beilschmiedia group of the Lauraceae remains ambiguous because flowering specimens of a few genera with confined distribution are poorly represented in herbaria, and a few floral characters important for taxonomy are still poorly known. Syndiclis is sporadically distributed in southwestern China, and is represented in the herbaria by only a few flowering specimens. We conducted field investigations to collect floral materials of four species and observed structures and ontogeny of the tiny flowers using both light microscopy (LM) and scanning electron microscopy (SEM). The results show that the genus Syndiclis possesses flowers with huge variation in both merosity and organ number. Flowers of the genus are dimerous, trimerous, or tetramerous, or have mixed merosity with monomerous and dimerous, or dimerous and trimerous, or trimerous and tetramerous whorls. The number of staminodes ranges from two to eight, depending on floral merosity, and on how many stamens of the third androecial whorl are reduced to staminodes. The staminodes of the fourth androecial whorl are comparable to the staminodes in Potameia, but the staminodes of the third androecial whorl of Syndiclis are relatively larger than the staminodes in Potameia. They are erect or curved inwards, covering the ovary. The anthers are usually two-locular, but rarely one-locular or three-locular. Each stamen of the third androecial whorl bears two conspicuous and enlarged glands at the base. The lability of floral merosity and organ number of Syndiclis may have been caused by changes of pollination system and loss of special selective pressures that are present in most Lauraceous plants with fixed floral organ number. This study furthers our understanding of variation and evolution of a few important characters of the Beilschmiedia group and provides essential data for a revised generic classification of the group.
学科领域	Plant Sciences
DOI	10.3389/fpls.2017.01225
收录类别	SCI
语种	英语
WOS关键词	PHYLOGENETIC ANALYSIS ; GENUS ; ANGIOSPERMS ; CHLOROPLAST ; PHYLLOTAXIS ; MORPHOLOGY ; SEQUENCES ; EVOLUTION ; SINOPORA ; YASUNIA
WOS记录号	WOS:000405164400002
出版者	PUBLIC LIBRARY SCIENCE
文献子类	Article
出版地	SAN FRANCISCO
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31470301, 31270238, 30970177] ; Scientific Research Project of Shenzhen Urban Administration [201519] ; Major Technical Research Project of the Innovation of Science and Technology Commission of Shenzhen [JSGG20140515164852417]
作者邮箱	ephedra@ibcas.ac.cn
作品OA属性	Green Published, gold
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/22287
专题	系统与进化植物学国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Systemat & Evolutionary Bot, Beijing, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Ferguson, David K.] Univ Vienna, Dept Paleontol, Vienna, Austria 4.Rohwer, Jens G.] Biozentrum Klein Flottbek, Hamburg, Germany
推荐引用方式 GB/T 7714	Zeng, Gang,Liu, Bing,Ferguson, David K.,et al. Floral structure and ontogeny of Syndiclis (Lauraceae)[J]. PLOS ONE,2017,12(10).
APA	Zeng, Gang,Liu, Bing,Ferguson, David K.,Rohwer, Jens G.,&Yang, Yong.(2017).Floral structure and ontogeny of Syndiclis (Lauraceae).PLOS ONE,12(10).
MLA	Zeng, Gang,et al."Floral structure and ontogeny of Syndiclis (Lauraceae)".PLOS ONE 12.10(2017).

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