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A cDNA clone encoding a putative dihydroflavonol 4-reductase gene has been isolated from a strawberry (Fragaria x ananassa cv Chandler) DNA subtractive library. Northern analysis showed that the corresponding gene is predominantly expressed in fruit, where it is first detected during elongation (green stages) and then declines and sharply increases when the initial fruit ripening events occur, at the time of initiation of anthocyanin accumulation. The transcript can be induced in unripe green fruit by removing the achenes, and this induction can be partially inhibited by treatment of de-achened fruit with naphthylacetic acid, indicating that the expression of this gene is under hormonal control. We propose that the putative dihydroflavonol 4-reductase gene in strawberry plays a main role in the biosynthesis of anthocyanin during color development at the late stages of fruit ripening; during the first stages the expression of this gene could be related to the accumulation of condensed tannins.

A Fruit-Specific Putative Dihydroflavonol 4-Reductase Gene Is Differentially Expressed in Strawberry during the Ripening Process1