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Luan, Yuting; Wang, Shasha; Wang, Ruqian; Xu, Changjie
Food chemistry, 03/2020, Volume: 309Journal Article
Display omitted •Red-peeled huyou accumulates β-citraurin in peel while ordinary huyou not.•Transcript level of CCD4b1 is nearly 100 fold higher in red-peeled huyou peel.•β-Citraurin accumulation was most favored at 15 °C in red-peeled huyou peel.•Ethylene did not affect β-citraurin accumulation in red-peeled huyou peel.•Expression of CCD4b1 and PSY1 paralleled temperature effects on peel color. Red-peeled huyou has a distinct red peel color due mainly to the presence of red apocarotenoid β-citraurin as well as the increase in amount of total carotenoids. The expression level of carotenoid cleavage dioxygenase 4b1 (CCD4b1) accounted for 99.0% of total transcript abundance of CCD4s in red-peeled huyou peel and was nearly 100 times higher than that in ordinary huyou. β-Citraurin accumulation and peel coloration was mostly favored at 15 °C but strongly inhibited at moderately high temperatures 20 °C and 25 °C. Exogenous ethylene application for 3 d had no obvious effect on β-citraurin accumulation in red-peeled huyou but holding fruit at moderately higher temperatures (20 °C and 25 °C) for 3 d had a significant adverse effect on β-citraurin accumulation. The expression of phytoene synthase 1 (PSY1) and CCD4b1 was higher at 10 °C and 15 °C and significantly lower at 20 °C and 25 °C. The mechanisms governing the accumulation of β-citraurin are discussed.
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