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Isolation and functional characterization of a novel gene coding for flavonoid 3′-hydroxylase from globe artichoke

  • Original Papers
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Biologia Plantarum

Abstract

Globe artichoke (Cynara cardunculus L. var. scolymus) is rich in flavonoids which contribute to its health-promoting properties. With the aim of understanding the genetic control of flavonoid accumulation in artichoke, we isolated an artichoke full-length cDNA sequence encoding flavonoid 3′-hydroxylase (F3′H), a major enzyme of the flavonoid hydroxylation pattern. In silico studies confirmed that the deduced amino acid sequence of CcF3′H is highly similar to F3′Hs isolated from other Asteraceae. The Northern blot analysis demonstrated that CcF3′H was highly expressed in leaves and in specific parts of the heads. Its expression differed slightly among artichoke cultivars. The overexpression of CcF3′H in tobacco plants led to the accumulation of flavonoids and to an increase of flower colour intensity, thus identifying CcF3′H as promising candidate for genetic engineering. CcF3′H represents the first structural gene of the flavonoid biosynthesis isolated from C. cardunculus, and its characterization sheds light on the accumulation of flavonoids.

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Abbreviations

ANS:

anthocyanidin synthase

CGA:

chlorogenic acid

DFR:

dihydroflavonol 4-reductase

FHT:

flavanone 3-hydroxylase

FLS:

flavonol synthase

FNSII:

flavone synthase II

F3′H:

flavonoid 3′-hydroxylase

F3′5′H:

flavonoid 3′,5′-hydroxylase

nptII:

neomycin phosphotransferase gene

ORF:

open reading frame

RACE:

rapid amplification of cDNA ends

RT-PCR:

reverse transcription polymerase chain reaction

UTR:

untranslated regions

WT:

wild type

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Correspondence to M. Tucci.

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Acknowledgements: We thank Dr. R. Pepe from the Agricultural Research Council, the Research Centre for Vegetable Crops (CRAORT) for providing globe artichoke cultivars. We are also grateful to Mr. R. Nocerino, A. Scafarto, and G. Guarino from the CNR-IBBR for an excellent technical assistance, and to Dr. G. Caruso from the Agronomy Department, University of Naples Federico II, for help with the statistical analysis. This research was partly supported by grants from the Italian Ministry for University and Scientific and Technological Research (DD 1291 15/12/2003, project 161 and DD n. 62/Ric 08/10/2012, project PON02_00395_3215002).

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Palma, M.D., Fratianni, F., Nazzaro, F. et al. Isolation and functional characterization of a novel gene coding for flavonoid 3′-hydroxylase from globe artichoke. Biol Plant 58, 445–455 (2014). https://doi.org/10.1007/s10535-014-0424-7

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  • DOI: https://doi.org/10.1007/s10535-014-0424-7

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