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Biologia Plantarum

, Volume 57, Issue 1, pp 179–183 | Cite as

Ectopic expression of the Osmyb4 rice gene enhances synthesis of hydroxycinnamic acid derivatives in tobacco and clary sage

  • T. Docimo
  • M. Mattana
  • R. Fasano
  • R. Consonni
  • N. de Tommasi
  • I. Coraggio
  • A. Leone
Brief Communication

Abstract

In this work, we report the ectopic expression of the Osmyb4 rice gene, encoding the Myb4 transcription factor, in Nicotiana tabacum and Salvia sclarea. Transcriptional analysis of T2 homozygous tobacco plants overexpressing Osmyb4 revealed that Myb4 activated the transcription of several genes of the phenylpropanoid pathway such as PAL, C4H, 4CL1, 4CL2 (encoding phenylalanine ammonia-lyase, cinnamic acid 4-hydroxylase, 4-coumarate: Co A ligase1, 4-coumarate: Co A ligase2). Moreover, the Myb4 increased expression of HQT encoding hydroxycinnamoyl-CoA: quinate transferase, which specifically triggers the accumulation of chlorogenic acid (CGA). In addition, increased acccumulation of rosmarinic acid (RA) was found in transgenic plants of both species. These results open the possibility of using the Osmyb4 gene to increase the production of specific bioactive hydroxycinnamates.

Additional key words

chlorogenic acid Myb transcription factor Nicotiana tabacum phenylpropanoid pathway rosmarinic acid Salvia sclarea 

Abbreviations

4CL

4-coumarate:CoA ligase

CGA

chlorogenic acid

C4H

cinnamic acid 4-hydroxylase

EPSPS

5-enolpyruvylshikimate 3-phosphate synthase

EV

empty vector

HPLC-DAD

high performance liquid chromatography — with diode array detection

HQT

hydroxycinnamoyl CoA quinate transferase

PAL

phenylalanine ammonia lyase

RA

rosmarinic acid

RAS

RA synthase

RT-PCR

reverse transcription — polymerase chain reaction

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  • T. Docimo
    • 1
  • M. Mattana
    • 1
  • R. Fasano
    • 2
  • R. Consonni
    • 3
  • N. de Tommasi
    • 2
  • I. Coraggio
  • A. Leone
    • 2
  1. 1.Istituto di Biologia e Biotecnologie AgrarieConsiglio Nazionale delle RicercheMilanoItalia
  2. 2.Facoltà di FarmaciaUniversità di SalernoFiscianoItalia
  3. 3.Istituto per lo Studio delle MacromolecoleConsiglio Nazionale delle RicercheMilanoItalia

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