Auxin induced carotenoid accumulation in GA and PDJ-treated citrus fruit after harvest

Combined spraying of gibberellin (GA) and prohydrojasmon (PDJ) was an effective method to prevent the physiological disorder peel puffing in citrus fruit. However, GA PDJ combined treatment inhibited carotenoid biosynthesis during fruit ripening process, which led mature with poor color. In present study, improve coloration PDJ-treated fruit, effects postharvest treatments two auxins, indole-3-acetic acid (IAA) 1-naphthaleneacetic (NAA), on accumulation were investigated Satsuma mandarin ‘Aoshima unshiu’ (Citrus unshiu Marc.). The results showed that IAA NAA induced after harvest. With NAA, contents β-carotene, β-cryptoxanthin, all-trans-violaxanthin, 9-cis-violaxanthin enhanced both flavedos juice sacs. increase accompany up-regulation biosynthetic genes down-regulation catabolic gene treatments. addition, ethylene production treatments, endogenous might stimulate presented this study suggested auxin for improving