Tree Genetics & Genomes

, Volume 4, Issue 2, pp 315–331 | Cite as

Identification of differentially expressed genes in the flesh of blood and common oranges

  • Concetta Licciardello
  • Maria Patrizia Russo
  • Gianpiero Vale’
  • Reforgiato Giuseppe Recupero
Original Paper


The objective of this research was the identification of genes differentially expressed in blood oranges compared to common oranges and the identification of anthocyanin pathway genes that are up-regulated in flesh of blood oranges. A subtracted complementary DNA library of 1,248 clones was constructed using RNA from the flesh of a nucellar line (58-8D-1) of Moro (a blood orange) as tester and from Cadenera (a common orange) as driver. After screening by reverse Northern, a total of 230 clones were found to be up-regulated in blood orange, while 30 were up-regulated in the common blond one. Sequence analysis identified genes involved in the anthocyanin pathway including genes encoding biosynthetic enzymes like phenylalanine ammonialyase, chalcone synthase, dihydroflavonol-4-reductase, anthocyanidin synthase, UDP:glucose flavonoid 3-O-glucosyltransferase, glutathione S-transferase, and a regulatory gene encoding a basic Helix-Loop-Helix protein, while others were related to primary metabolism, flavor biosynthesis, signal transduction mechanisms, and defense. Some sequences were classified as unknown and unnamed and some others were unclassified. Semiquantitative reverse transcription-polymerase chain reaction (PCR) and quantitative real-time PCR were used to confirm the differential expression patterns of selected candidate genes of different functional classes. Correlations between the expression of some genes and the processes involved in the ripening of blood oranges were identified.


SSH-PCR Select Anthocyanins Differential expression Citrus sinensis L. EST 



We acknowledge Cathie Martin for her critical review of this manuscript and suggestions. This work was supported by EU funds provided through the Science and Technology Park of Sicily (Pon no. 12839 Italian Ministry of University and Research) and by Agronanotech (Italian Ministry of Agriculture) projects for founding PhD thesis of Concetta Licciardello.


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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • Concetta Licciardello
    • 1
  • Maria Patrizia Russo
    • 2
  • Gianpiero Vale’
    • 3
  • Reforgiato Giuseppe Recupero
    • 2
  1. 1.PSTS—Parco Scientifico e Tecnologico dellaSiciliaCataniaItaly
  2. 2.CRA—Istituto Sperimentale per l’AgrumicolturaAcirealeItaly
  3. 3.CRA—Istituto Sperimentale per la CerealicolturaFiorenzuola d’Arda (PC)Italy

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