Fig. 4.
Transcript levels of the CCD4b1 gene and the accumulation of the C30 apocarotenoid β-citraurin, in the peel and pulp of Navel sweet orange (A), Clementine mandarin, and the hybrid Fortune mandarin (B) during fruit development and ripening. Changes in the concentration of the putative precursors of β-citraurin, β-cryptoxanthin, and zeaxanthin, are also shown, and for comparative purposes the same scale for both xanthophylls is used. The stages of fruit development and ripening are: IG, immature green; M1 and M2, mature green; B1 and B2, breaker; C, coloured; and FC, fully coloured fruit, as described in Alquézar et al. (2008b ). Expression values are relative to transcript levels obtained in the peel of sweet orange at the IG stage which was arbitrarily set to 1. Data of carotenoid content and transcripts accumulation are means ±SD of three replicates.