Effect of Enhanced Ultraviolet-B Radiation on Fruit Maturity and Quality and Leaf Photosynthesis in ‘Guifei’ Mango

To investigate the characteristics of photosynthetic physiological changes in leaves Mangifera indica L. cv. Guifei under enhanced ultraviolet (UV)-B radiation, natural light-exposed trees were used as controls and 96 kJ·m −2 ·d −1 UV-B radiation was artificially simulated field. The fruit maturity quality, leaf net rate (P n ), pigment contents, photochemical reactions, activities enzymes related gene expression levels determined. Compared with control, percentage mature fruits treatment significantly increased, quality improved. content, Hill reaction activity, quenching coefficient (qP) treated showed higher values than those control leaves. Rubisco activating enzyme (RCA) large subunit small increased. Treatment ultraviolet-B improved activity by increasing genes, thereby enhancing CO 2 -fixing capacity dark Thus, which promoted early ‘Guifei’ mango rapid accumulation products.