Fig. 6

Carotenoid biosynthetic pathway in the yellow peel and red flesh of papaya. a, Carotenoid biosynthetic pathway in the sample of PE2 versus PE1 (PE1-vs-PE2). b, Carotenoid biosynthetic pathway in the sample of FL2 versus FL1 (FL1-vs-FL2). Genes examined are in red or blue italic bold letters: genes with red or blue color means they are up- or down-regulated during papaya fruit ripening respectively. The carotenoids in rectangular boxes were determined in the study. The red-frame boxes refer to the content of carotenoid is increasing during papaya fruit ripening and the blue-frame boxes refer to the content of carotenoid is decreasing. (The diagram is modified from Naik et al. [40])