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The composition and timing of flower odour emission by wild Petunia axillaris coincide with the antennal perception and nocturnal activity of the pollinator Manduca sexta

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Abstract

In the genus Petunia, distinct pollination syndromes may have evolved in association with bee-visitation (P. integrifolia spp.) or hawk moth-visitation (P. axillaris spp). We investigated the extent of congruence between floral fragrance and olfactory perception of the hawk moth Manduca sexta. Hawk moth pollinated P. axillaris releases high levels of several compounds compared to the bee-pollinated P. integrifolia that releases benzaldehyde almost exclusively. The three dominating compounds in P. axillaris were benzaldehyde, benzyl alcohol and methyl benzoate. In P. axillaris, benzenoids showed a circadian rhythm with an emission peak at night, which was absent from P. integrifolia. These characters were highly conserved among different P. axillaris subspecies and P. axillaris accessions, with some differences in fragrance composition. Electroantennogram (EAG) recordings using flower-blends of different wild Petunia species on female M. sexta antennae showed that P. axillaris odours elicited stronger responses than P. integrifolia odours. EAG responses were highest to the three dominating compounds in the P. axillaris flower odours. Further, EAG responses to odour-samples collected from P. axillaris flowers confirmed that odours collected at night evoked stronger responses from M. sexta than odours collected during the day. These results show that timing of odour emissions by P. axillaris is in tune with nocturnal hawk moth activity and that flower-volatile composition is adapted to the antennal perception of these pollinators.

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Abbreviations

EAG:

Electroantennogram

EAD:

Electroantennogram detection

QTL:

Quantitative trait loci

GC:

Gas chromatogram

MS:

Mass spectrometer

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Acknowledgements

Special thanks to C. Ball, R. Alder (University of Bern, Institute of Plant Sciences) and C. Faria (University of Neuchâtel, Institute of Zoology) for plant care, and to L. Broger, Dr. J. Moore, C. Galliot, R. Schreyer and A. Dell’Olivo (University of Bern, Institute of Plant Sciences) for insightful comments on an earlier version of the manuscript. This work was part of the National Centre for Competence in Research “Plant Survival” with financial support by the Swiss National Science Foundation and the Canton Bern.

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Correspondence to Cris Kuhlemeier.

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Hoballah, M.E., Stuurman, J., Turlings, T.C.J. et al. The composition and timing of flower odour emission by wild Petunia axillaris coincide with the antennal perception and nocturnal activity of the pollinator Manduca sexta . Planta 222, 141–150 (2005). https://doi.org/10.1007/s00425-005-1506-8

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