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Fig. 1 | BMC Plant Biology

Fig. 1

From: A mutant allele of ζ-carotene isomerase (Z-ISO) is associated with the yellow pigmentation of the “Pinalate” sweet orange mutant and reveals new insights into its role in fruit carotenogenesis

Fig. 1

Schematic representation of carotenoid biosynthetic pathway in sweet orange (Citrus sinensis) fruit indicating main enzymes involved in carotenoid compositional changes during ripening. The predominant flux in immature and full ripe fruit tissues is indicated in green and red arrows, respectively. The discontinuous arrow indicates a enzymatic step not yet characterized. The structure of the main carotenoids involved in sweet orange fruit pigmentation is background colored. Representative pictures of ‘Pinalate’ sweet orange mutant and its parental genotype ‘Navelate’ are positioned in the pathway close to the most abundant carotenoid in mature fruit tissues. PSY, phytoene synthase; PDS, phytoene desaturase; Z-ISO, 15-cis-ζ-carotene isomerase; ZDS, ζ-carotene desaturase; CRTISO, lycopene isomerase; βLCY1, lycopene β-cyclase 1; βLCY2, chromoplast-specific lycopene β-cyclase2; εLCY, lycopene ε-cyclase; CYP97A and CYP97C, heme-containing cytochrome P450 hydroxylases; βCHX, non-heme β-carotene hydroxylase; ZEP, zeaxanthin epoxidase; NSY, neoxanthin synthase; CCD4b, carotenoid cleavage dioxygenase type 4; 9-Z-ISO, 9-Z-violaxanthin isomerase. GGPP, Geranyl geranyl pyrophosphate. Carotenoid structure images were obtained from http://carotenoiddb.jp/ [2]

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BMC Plant Biology

ISSN: 1471-2229

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