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AOBPreview published online on October 23, 2006
Annals of Botany, doi:10.1093/aob/mcl212
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© 2006 The Author(s)
Received June 6, 2006
Revised August 7, 2006
Accepted August 30, 2006

Article

Floral Scent Diversity is Differently Expressed in Emitted and Endogenous Components in Petunia axillaris Lines

M. KONDO 1, N. OYAMA-OKUBO 2 *, T. ANDO 3, E. MARCHESI 4, and M. NAKAYAMA 2

1 Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8572 Japan
2 Research Team for Flower Quality, National Institute of Floricultural Science, National Agriculture and Food Research Organization, 2-1 Fujimoto, Tsukuba, Ibaraki, 305-8519 Japan
3 Faculty of Horticulture, Chiba University, 648 Matsudo, Matsudo, Chiba, 271-8510 Japan
4 Facultad de Agronomia, Universidad de la República, Garzón 780, Montevideo, Uruguay

* To whom correspondence should be addressed.
N. OYAMA-OKUBO, E-mail: namisea1{at}affrc.go.jp


  Abstract

• Background and Aims Among the subspecies of Petunia axillaris are various lines emitting sensorially different scents. Analysis of variations in floral scent among genetically close individuals is a powerful approach to understanding the mechanisms for generating scent diversity.

• Methods Emitted and endogenous components were analysed independently to gain information about evaporation and endogenous production in 13 wild lines of P. axillaris. A dynamic headspace method was used to collect emitted components. Endogenous components were extracted with solvent. Both of these sample types were subjected to quantitative and qualitative analysis by gas chromatography (GC)-flame ionization detector (FID) and GC-mass spectrometry (MS).

• Key Results and Conclusions Whereas the profiles of emitted compounds showed qualitative homogeneity, being mainly composed of methyl benzoate with quantitative variation, the profiles of endogenous compounds showed both qualitative and quantitative variation. A negative correlation was found between the evaporation ratio and boiling point of each compound examined. Lower boiling point compounds were strongly represented in the emitted component, resulting in the reduction of qualitative variation in floral scent. In conclusion, floral scent diversity results from variation in both the endogenous production and the evaporation rate of the individual volatile compounds.

Keywords: Evaporation, floral scent, headspace, Petunia axillaris, volatile benzenoid/phenylpropanoid.
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