Postharvest UV-C Irradiation Influenced Cellular Structure, Jasmonic Acid Accumulation, and Resistance Against Green Mold Decay in Satsuma Mandarin Fruit (Citrus unshiu)

• Published in: Frontiers in sustainable food systems Vol. 5
• Main Authors: Phonyiam, Orathai, Ohara, Hitoshi, Kondo, Satoru, Naradisorn, Matchima, Setha, Sutthiwal
• Format: Journal Article
• Language: English
• Published: Frontiers Media S.A 24.06.2021
• Subjects: cellular structure; green mold; jasmonic acid; mandarin fruit; UV-C radiation
• ISSN: 2571-581X; 2571-581X
• DOI: 10.3389/fsufs.2021.684434

Green mold caused by Penicillium digitatum is an important factor limiting the shelf life of mandarin fruit. In this study, the effect of ultraviolet-C (UV-C) irradiation on cellular structure, endogenous jasmonic acid (JA), and development of P. digitatum in satsuma mandarin fruit was investigated. UV-C treatments included 0 (untreated control), 3, and 10 kJ m −2 or the exposure time of 0, 1.18, and 4.52 min, respectively. The UV-C dose of 10 kJ m −2 significantly reduced the development of P. digitatum both in vitro and in vivo , resulting in the maintenance of the cellular structure of the albedo tissue. The production of malondialdehyde (MDA) was decreased upon UV-C treatment of 10 kJ m −2 . The concentration of JA increased in the treatment of 10 kJ m −2 compared to the treatment of 3 kJ m −2 and the control. UV-C irradiation increased total phenolic and total flavonoid concentrations and DPPH radical scavenging capacity. These results suggest that UV-C at 10 kJ m −2 has a potential to control green mold caused by P. digitatum , maintain cellular structure, stimulate the accumulation of JA, and induce biochemical compounds in satsuma mandarin.