Effects of Light Intensity on Endogenous Hormones and Key Enzyme Activities of Anthocyanin Synthesis in Blueberry Leaves

Plant anthocyanin is a secondary metabolite widely distributed in the roots, stems, leaves, flowers and fruits of plants, its synthesis significantly affected by light intensity. To reveal physiological response mechanism blueberry leaves at different intensities, four intensities (100% (CK), 75%, 50% 25%) were set for ‘O’Neal’ southern highbush as experimental material our study. The relationship between endogenous hormone contents, key enzyme activities, variations content under various during white fruit stage (S1), purple (S2) blue (S3) development studied. results showed that increased first then decreased, decreased with increase intensity stage, respectively. appropriate could promote anthocyanin, treated 75% was 1.09~4.08 times other treatments. or activities gibberellin (GA3), indoleacetic acid (IAA), jasmonic (JA), abscisic (ABA), ethylene (ETH), phenylalanine ammonia lyase (PAL), chalcone isomerase (CHI), dihydroflavonol reductase (DFR) UDP-glucose: flavonoid 3-glucosyltransferase (UFGT) extremely correlated leaves. This indicated promoted affecting contents pathway. study lays foundation further research on molecular regulating