Effect of MPTA on Carotenoid Biosynthesis in Peel of Citrus(Citrus succosa Hort.ex Tanaka) Fruit
TAO Jun 1,2 ZHANG Shang-Long 1 ZHANG Liang-Cheng 1 XU Chang-Jie 1 CHEN Jun-Wei 1 ( 1 Department of Horticulture, Zhejiang University, Hangzhou 310029; 2 Department of Horticulture, Yangzhou University,Yangzhou 225009)
Effect of 2-(4-methyl-phenoxy)triethylamine (MPTA) treatment on peel color of citrus (Citrus succosa Hort.ex Tanaka) fruit was investigated and the possible relationship of this compound with the dynamics of relevant carotenoids and change in sugar content examined. MPTA promoted carotenoid biosysthesis (Fig.2), especially lycopene accumulation (Fig.3), leading to change in peel color from light orange-yellow to red (Fig.1). The accumulation of lycopene was paralleled by a decrease in glucose content(Fig.4), but not related to changs in β-cryptoxanthin and zeaxanthin content of the peel(Fig.3).