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Diurnal regulation of scent emission in rose flowers

Abstract

Previous studies have shown diurnal oscillation of scent emission in rose flowers with a peak during the day (Helsper in Planta 207:88–95, 1998; Picone in Planta 219:468–478, 2004). Here, we studied the regulation of scent production and emission in Rosa hybrida cv. Fragrant Cloud during the daily cycle and focused on two terpenoid compounds, germacrene D and geranyl acetate, whose biosynthetic genes have been characterized by us previously. The emission of geranyl acetate oscillated during the daily light/dark cycle with a peak early in the light period. A similar daily fluctuation was found in the endogenous level of this compound and in the expression of its biosynthetic gene, alcohol acetyl transferase (RhAAT). The rhythmic expression of RhAAT continued under conditions of constant light or darkness, indicating regulation by the endogenous circadian clock. However, the accumulation and emission of geranyl acetate ceased under continuous light. Our results suggest that geranyl acetate production is limited by the level of its substrate geraniol, which is suppressed under constant light conditions. The emission of germacrene D also oscillated during the daily cycle with a peak early in the light period. However, the endogenous level of this compound and the expression of its biosynthetic gene germacrene D synthase (RhGDS) were constant throughout the day. The diurnal oscillation of germacrene D emission ceased under continuous light, suggesting direct regulation by light. Our results demonstrate the complexity of the diurnal regulation of scent emission: although the daily emission of most scent compounds is synchronized, various independently evolved mechanisms control the production, accumulation and release of different volatiles.

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Abbreviations

2-PE:

2-Phenylethanol

2-PEG:

Glycosylated 2-PE;

BAMT:

Benzoic acid carboxyl methyltransferase

RhAAT:

Rosa hybrida alcohol acetyl transferase

RhGDS:

Rosa hybrida germacrene D synthase

SAMT:

S-Adenosyl-l-Met:salicylic acid carboxyl methyltransferase

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Acknowledgments

This work was supported by the US Israel Binational Agriculture Research and Development fund (grant no. US-3437) and by the Pearlstein Fund for research in floriculture at the Hebrew University. We thank the donors for their help.

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Correspondence to David Weiss.

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Hendel-Rahmanim, K., Masci, T., Vainstein, A. et al. Diurnal regulation of scent emission in rose flowers. Planta 226, 1491–1499 (2007). https://doi.org/10.1007/s00425-007-0582-3

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Keywords

  • Circadian rhythm
  • Floral scent
  • Geranyl acetate
  • Germacrene D
  • Rose