Peach flesh color is a monogenic trait with the white phenotype being dominant over the
yellow; its expression has been reported to be determined by a carotenoid degradative
enzyme. In the present study, a carotenoid cleavage dioxygenase (ccd4) gene was
analyzed to test whether it can be responsible for the flesh color determinism. The analysis
was conducted on chimeric mutants with white and yellow sectors of the fruit mesocarp; it
was then extended to a pool of cultivars and a segregating F 1 population. A ccd4 functional …

To better understand the fruit flesh coloration mechanism of peach (Prunus persica), the
composition and accumulation of carotenoids were compared, the expression profile of key
genes involved in carotenoid biosynthetic and catabolic pathways was performed, and the
differentially expressed genes were identified using “Piqiutao”(white fruit flesh) and its
mutant yellow “Piqiutao” at different fruit development stages. The results showed that the
total carotenoid content in yellow “Piqiutao” was remarkably higher than that of “Piqiutao,” …