Floral syndrome and insect pollination of the Qinghai-Tibet Plateau endemic Swertia przewalskii (Gentianaceae)

NWIPB OpenIR

	Floral syndrome and insect pollination of the Qinghai-Tibet Plateau endemic Swertia przewalskii (Gentianaceae)
	Duan, YW ; Liu, JQ
	2003-09-01
发表期刊	ACTA PHYTOTAXONOMICA SINICA
卷号	41 期号:5 页码:465-474
文章类型	Article
摘要	A combination of dichogamy and herkogamy in hermaphroditic plants is an effective mechanism to encourage outerossing and avoid selfing. In this paper, we studied whether such a mechanism completely avoids geitonogamous selfing in Swertia przewalskii Pissjauk., a perennial endemic to the Qinghai-Tibet Plateau. We studied the floral syndrome of this species and found that its flowers are characteristic of dichogamy and herkogamy. Each individual plant of this species has an average of three flowers ranging from one to six, at both staminate and pistillate stages with a ratio of 2: 1 in full anthesis. No autonomous selfing was found in the breeding experiments, indicating that this species is pollinator-dependent for seed. But artificial selfing production for geitonogamy produced high seed set, which implies that selfing can not be completely avoided if effective pollinators move continuously between flowers within an individual plant. A variety of insects were observed to visit S. przewalskii, but the most effective and common pollinators were Bumbus keshimirensis Friese (Bumbidae) and Apis mellifera L. (Apidae). A further statistic observation of these two effective pollinators indicated that they showed no preference to either staminate or pistillate flowers but always visited them from the lower flowers to upper ones within individuals. We further calculated the frequency of their visits between and within individual plants. Among the pollinators' bouts, the proportion of geitonogamous visits within an individual plant occupied about 37%. Such a case implied that geitonogamous selfing was not avoided in S. przewalskii in spite of floral dichogamy and herkogamy, suggesting that dichogamy and herkogamy in hermaphroditic plants play a more important role in reducing interference between male and female function than in encouraging outerossing.
关键词	Swertia Przewalskii Dichogamy Herkogamy Outcrossing Geitonogamous Selfing Bisexual Interference
WOS标题词	Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]	DISPLAY SIZE ; DICHOGAMY ; ECOLOGY ; INTERFERENCE ; ANGIOSPERMS ; AVOIDANCE ; STIGMAS ; POLLEN ; PLANTS
收录类别	SCI
语种	英语
WOS研究方向	Plant Sciences
WOS类目	Plant Sciences
WOS记录号	WOS:000185749300006
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/6941
专题	中国科学院西北高原生物研究所
作者单位	1.Chinese Acad Sci, Lab Qinghai Tibet Plateau Biol Evolut & Adaptat, NW Inst Plateau Biol, Xining 810001, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
推荐引用方式 GB/T 7714	Duan, YW,Liu, JQ. Floral syndrome and insect pollination of the Qinghai-Tibet Plateau endemic Swertia przewalskii (Gentianaceae)[J]. ACTA PHYTOTAXONOMICA SINICA,2003,41(5):465-474.
APA	Duan, YW,&Liu, JQ.(2003).Floral syndrome and insect pollination of the Qinghai-Tibet Plateau endemic Swertia przewalskii (Gentianaceae).ACTA PHYTOTAXONOMICA SINICA,41(5),465-474.
MLA	Duan, YW,et al."Floral syndrome and insect pollination of the Qinghai-Tibet Plateau endemic Swertia przewalskii (Gentianaceae)".ACTA PHYTOTAXONOMICA SINICA 41.5(2003):465-474.