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Expression pattern of CYC-like genes relating to a dorsalized actinomorphic flower in Tengia(Gesneriaceae)

Journal of Systematics and Evolution 2010年第5期48卷 309-317页

作者： 1Hong-Bo PANG 2Qing-Wen SUN 2Shun-Zhi HE 1Yin-Zheng WANG 1(State Key Laboratory of Systematic and Evolutionary Botany,Institute of Botany,Chinese Academy of Sciences,Beijing 100093,China) 2(Guiyang College of Traditional Chinese Medicine,Guiyang 550002,China) (State Key Laboratory of Systematic and Evolutionary Botany Institute of Botany Chinese Academy of Sciences Beijing 100093 China) (Guiyang College of Traditional Chinese Medicine Guiyang 550002 China)

Tengia has been called a "natural peloria" in the family Gesneriaceae because it exhibits an almost perfect actinomorphic flower from whorl one to whorl *** would be especially interesting to know whether or how CYC-like gene activities are related to this type of perfect actinomorphic *** address this,we have isolated four CYC-like TCP genes and carried out an investigation on their expression patterns in ***1C and TsCYC1D have similar expression patterns with strong signals being detected in all five petals and stamens,whereas TsCYC2A and TsCYC2B are only transiently expressed in the very early floral *** results suggest that the expansion of the expressions of TsCYC1C and TsCYC1D from the dorsal to the ventral petals is likely responsible for the evolutionary formation of the fully dorsalized actinomorphic corolla,that is,an expanded functional domain of CYC-like gene dorsal identity in Tengia ***,the expressions of TsCYC1C and TsCYC1D are not correlated with stamen abortion;therefore,TsCYC genes do not functionally repress the stamen development in Tengia *** is probably due to changed cis-activities that result in the cell cycle-related genes uncoupling from the TsCYC regulatory pathway in Tengia.

关键词： actinomorphy CYCLOIDEA dorsalized Gesneriaceae RNA in situ hybridization Tengia.

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Support for the predictions of the pollinator-mediated stabilizing selection hypothesis

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Journal of Plant Ecology 2008年第3期1卷 173-178页

作者： Mark van Kleunen Anna Meier Moritz Saxenhofer Markus Fischer Institute of Plant Sciences University of BernAltenbergrain 21CH-3013 BernSwitzerland

Aims Floral traits are frequently used in traditional plant systematics because of their assumed *** potential reason for the apparent constancy of flower size is that effective pollen transfer between flowers depends on the accuracy of the physical fit between the flower and ***,flowers are likely to be under stronger stabilizing selection for uniform size than vegetative plant ***,as predicted by the pollinator-mediated stabilizing selection(PMSS)hypothesis,an accurate fit between flowers and their pollinators is likely to be more important for specialized pollination systems as found in many species with bilaterally symmetric(zygomorphic)flowers than for species with radially symmetric(actinomorphic)*** In a comparative study of 15 zygomorphic and 13 actinomorphic species in Switzerland,we tested whether variation in flower size,among and within individuals,is smaller than variation in leaf size and whether variation in flower size is smaller in zygomorphic compared to actinomorphic *** findings Indeed,variation in leaf length was significantly larger than variation in flower length and ***-individual variation in flower and leaf sizes did not differ significantly between zygomorphic and actinomorphic *** line with the predictions of the PMSS,among-individual variation in flower length and flower width was significantly smaller for zygomorphic species than for actinomorphic species,while the two groups did not differ in leaf length *** suggests that plants with zygomorphic flowers have undergone stronger selection for uniform flowers than plants with actinomorphic *** supports that the relative uniformity of flowers compared to vegetative structures within species,as already observed in traditional plant systematics,is,at least in part,a consequence of the requirement for effective pollination.

关键词： actinomorphy flower size floral symmetry phenotypic variance zygomorphy

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