January 24, 2024 | Postharvest Biology and Technology |
Researchers from Hainan University and China Agricultural University conducted a study to investigate the effects of methyl jasmonate (MeJA) on chilling injury (CI) in ‘Guifei’ mango fruit during cold storage. Chilling injury is a major limitation in the postharvest handling and cold chain logistics of mango, affecting fruit quality and shelf life. MeJA, a phytohormone known for its role in regulating abiotic stress responses, was tested for its potential to mitigate CI symptoms.
Mango fruit was treated with 50 µM MeJA and stored at 4 °C. Results showed that MeJA significantly reduced CI symptoms, delayed chlorophyll degradation (as indicated by higher Fv/Fm values), and promoted desirable ripening attributes such as improved color change, softening, and increased soluble solids. The treatment also decreased relative conductivity, malondialdehyde (MDA) levels, and reactive oxygen species (ROS), suggesting reduced membrane damage and oxidative stress.
MeJA enhanced the activity of key antioxidant enzymes (SOD, CAT, APX, GR) and preserved mitochondrial structure. In addition, MeJA treatment improved intracellular energy status by increasing ATP levels and the activity of metabolic enzymes, along with higher levels of NADH and FADH₂. Gene expression analysis indicated that MeJA also supported ATP homeostasis through regulation of genes involved in ATP transport and regeneration.
Overall, MeJA treatment improved cold tolerance in mango by enhancing antioxidant defense and energy metabolism.
