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Related Experiment Videos

Scent evolution in Chinese roses.

Gabriel Scalliet1, Florence Piola, Christophe J Douady

  • 1Institut Fédératif de Recherche 128, Unité Mixte de Recherche 5667, Centre National de la Recherche Scientifique, Institut National de la Recherche Agronomique, Université Lyon 1, Ecole Normale Supérieure de Lyon, France.

Proceedings of the National Academy of Sciences of the United States of America
|April 17, 2008
PubMed
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The evolution of rose scent involves specific enzymes, orcinol O-methyltransferases (OOMT1 and OOMT2). Chinese roses uniquely possess both OOMT genes, crucial for the characteristic tea scent in modern varieties.

Area of Science:

  • Plant biochemistry
  • Evolutionary biology
  • Genomics

Background:

  • 3,5-dimethoxytoluene (DMT) is a key scent compound in modern roses, contributing to their "tea scent."
  • Phenolic methyl ether (PME) biosynthesis is primarily found in Chinese wild roses.
  • Modern roses inherited scent traits from both European and Chinese progenitors.

Purpose of the Study:

  • Investigate the genetic basis of DMT biosynthesis in roses.
  • Determine the evolutionary history of O-methyltransferase (OOMT) genes in the genus Rosa.
  • Identify the genetic factors responsible for the unique scent profiles of Chinese roses.

Main Methods:

  • Comparative genomics analysis of the OOMT gene family across 18 diverse rose species.
  • Enzyme kinetics and substrate specificity studies of OOMT1 and OOMT2.

Related Experiment Videos

  • Phylogenetic analysis to infer the evolutionary relationships of OOMT genes.

    • Main Results:

    • A single amino acid polymorphism in the substrate binding site of OOMTs largely explains their differing specificities.
    • Only Chinese rose species possess both OOMT1 and OOMT2 genes.
    • OOMT1 genes in Chinese roses likely evolved from an OOMT2-like ancestral gene found in all roses.

    Conclusions:

    • The sequential action of OOMT1 and OOMT2, driven by specific amino acid variations, is critical for DMT biosynthesis.
    • The emergence of the OOMT1 gene in Chinese roses was a pivotal event in the evolution of rose scent.
    • Understanding OOMT evolution provides insights into the genetic diversification of fragrance in cultivated roses.