Plant Molecular Biology

, Volume 72, Issue 3, pp 235–245

Identification of rose phenylacetaldehyde synthase by functional complementation in yeast

  • Moran Farhi
  • Orly Lavie
  • Tania Masci
  • Keren Hendel-Rahmanim
  • David Weiss
  • Hagai Abeliovich
  • Alexander Vainstein
Article

Abstract

Rose flowers, like flowers and fruits of many other plants, produce and emit the aromatic volatiles 2-phenylacetaldehyde (PAA) and 2-phenylethylalchohol (PEA) which have a distinctive flowery/rose-like scent. Previous studies in rose have shown that, similar to petunia flowers, PAA is formed from l-phenylalanine via pyridoxal-5′-phosphate-dependent l-aromatic amino acid decarboxylase. Here we demonstrate the use of a Saccharomyces cerevisiaearo10∆ mutant to functionally characterize a Rosa hybrida cv. Fragrance Cloud sequence (RhPAAS) homologous to petunia phenylacetaldehyde synthase (PhPAAS). Volatile headspace analysis of the aro10∆ knockout strain showed that it produces up to eight times less PAA and PEA than the WT. Expression of RhPAAS in aro10∆ complemented the yeast’s mutant phenotype and elevated PAA levels, similar to petunia PhPAAS. PEA production levels were also enhanced in both aro10∆ and WT strains transformed with RhPAAS, implying an application for metabolic engineering of PEA biosynthesis in yeast. Characterization of spatial and temporal RhPAAS transcript accumulation in rose revealed it to be specific to floral tissues, peaking in mature flowers, i.e., coinciding with floral scent production and essentially identical to other rose scent-related genes. RhPAAS transcript, as well as PAA and PEA production in flowers, displayed a daily rhythmic behavior, reaching peak levels during the late afternoon hours. Examination of oscillation of RhPAAS transcript levels under free-running conditions suggested involvement of the endogenous clock in the regulation of RhPAAS expression in rose flowers.

Keywords

ARO10 floral scent 2-Phenylacetaldehyde 2-Phenylethylalchohol Rose Volatiles 

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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Moran Farhi
    • 1
    • 2
  • Orly Lavie
    • 1
  • Tania Masci
    • 1
  • Keren Hendel-Rahmanim
    • 1
  • David Weiss
    • 1
  • Hagai Abeliovich
    • 2
  • Alexander Vainstein
    • 1
  1. 1.The Robert H. Smith Institute of Plant Sciences and Genetics in Agriculture, Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael
  2. 2.Department of Biochemistry and Food Science, The Robert H. Smith Faculty of Agriculture, Food and EnvironmentThe Hebrew University of JerusalemRehovotIsrael

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