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Reproductive isolation of two sympatric louseworts, Pedicularis rhinanthoides and Pedicularis longiflora (Orobanchaceae): how does the same pollinator type avoid interspecific pollen transfer?
Yang, Chun-Feng; Gituru, Robert W.; Guo, You-Hao
2007
Source PublicationBIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY
ISSN0024-4066
Volume90Issue:1Pages:37-48
AbstractTo study the isolation mechanism of two commonly intermingled louseworts, Pedicularis rhinanthoides and Pedicularis longiflora, pollination biology in three mixed populations with the two species was investigated during a 3-year project. The results indicated that higher flowering density could help to enhance pollinator activity, and thus increase reproductive output. Bumblebees are the exclusive pollinator for the two louseworts and are essential for their reproductive success. Reproductive isolation between the two species is achieved by a combination of pre- and postzygotic isolation mechanisms. Although both species are pollinated by bumblebees, the present study indicates they successfully avoid interspecific pollen transfer due to floral isolation. Mechanical isolation is achieved by the stigma in the two species picking up pollen from different parts of the pollinator's body, whereas ethological isolation occurs due to flower constancy. Additionally, strong postzygotic isolation was demonstrated by non seed set after artificial cross-pollination even with successful pollen tube growth. We describe the hitherto unreported role of variation in the tightness and direction of the twist of the corolla beak in maintaining mechanical isolation between Pedicularis species. Although floral isolation in Pedicularis is incomplete, it is considered to be an important mechanism in maintaining species boundaries in the genus. (c) 2007 The Linnean Society of London, Biological Journal of the Linnean Society.
KeywordSeed-set Ethological Isolation Floral Morphology Mount-rainier Scrophulariaceae Ecology Bumblebees Hybridization Population Adaptation
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.xtbg.org.cn/handle/353005/9838
Collection文献共享
Recommended Citation
GB/T 7714
Yang, Chun-Feng,Gituru, Robert W.,Guo, You-Hao. Reproductive isolation of two sympatric louseworts, Pedicularis rhinanthoides and Pedicularis longiflora (Orobanchaceae): how does the same pollinator type avoid interspecific pollen transfer?[J]. BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY,2007,90(1):37-48.
APA Yang, Chun-Feng,Gituru, Robert W.,&Guo, You-Hao.(2007).Reproductive isolation of two sympatric louseworts, Pedicularis rhinanthoides and Pedicularis longiflora (Orobanchaceae): how does the same pollinator type avoid interspecific pollen transfer?.BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY,90(1),37-48.
MLA Yang, Chun-Feng,et al."Reproductive isolation of two sympatric louseworts, Pedicularis rhinanthoides and Pedicularis longiflora (Orobanchaceae): how does the same pollinator type avoid interspecific pollen transfer?".BIOLOGICAL JOURNAL OF THE LINNEAN SOCIETY 90.1(2007):37-48.
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