Pollen morphology of Youngia and six related genera (Asteraceae: Cichorieae) and its systematic significance

	Pollen morphology of Youngia and six related genera (Asteraceae: Cichorieae) and its systematic significance
	Peng, YL ; Gao, XF ; Peng, L
刊名	PHYTOTAXA
	2013
卷号	139 期号:1 页码:36-62
关键词	Asteraceae Cichorieae Youngia
ISSN号	1179-3155
通讯作者	Peng, YL ; Gao, XF
产权排序	1
中文摘要	The pollen morphology of 15 species representing four sections of Youngia and 11 species from six other genera of the tribe Cichorieae was investigated. Measurements and observations were conducted through scanning electron microscopy. This study aims to provide new and useful information regarding the extent of pollen morphological diversity within the genus Youngia and related genera in the tribe Cichorieae and thus to contribute to a better understanding of the taxonomy and evolution of these groups. Six pollen types, distinguished primarily by the number of apertures and spines in the polar region, are described. Palynological characters are not useful for the delimitation of Youngia and its closely related genera Crepidiastrum, Ixeridium, and Crepis at the generic level, and did not fully resolve the relationships between the groups. The distinction of Faberia from the other members of the subtribe Crepidinae is supported by the pollen characters. Pollen morphology also did not support that Youngia sect. Desiphylum sensu Babcock and Stebbins may be separated at the generic level either as Tibetoseris or Pseudoyoungia. Four pollen types were found in Youngia s.l., i.e. Y. racemifera type, Y. japonica type, Y. prattii type and Y. sericea type, which partly reflect the sectional classification of Youngia sensu Babcock and Stebbins. The systematic position of Y. racemifera should be reconsidered according to pollen characters. The pollen data suggest that Y. sect. Mesomeris is not monophyletic, and the relationships of its species require further examination.
学科主题	Plant Sciences
收录类别	SCI
语种	英语
WOS记录号	WOS:000325990400002
公开日期	2014-11-21
内容类型	期刊论文
源URL	[http://210.75.237.14/handle/351003/24261]
专题	成都生物研究所_生态研究
推荐引用方式 GB/T 7714	Peng, YL,Gao, XF,Peng, L. Pollen morphology of Youngia and six related genera (Asteraceae: Cichorieae) and its systematic significance[J]. PHYTOTAXA,2013,139(1):36-62.
APA	Peng, YL,Gao, XF,&Peng, L.(2013).Pollen morphology of Youngia and six related genera (Asteraceae: Cichorieae) and its systematic significance.PHYTOTAXA,139(1),36-62.
MLA	Peng, YL,et al."Pollen morphology of Youngia and six related genera (Asteraceae: Cichorieae) and its systematic significance".PHYTOTAXA 139.1(2013):36-62.