Abstract
Cantaloupe (Cucumis melo L.) is one of the most delicious fruits popularly cultivated in tropical regions due to its sweet-juicy taste, attractive flavor and bioactive composition. Extending cantaloupe shelf-life during handling and distribution is very necessary to upgrade its commercial value. Methyl jasmonate (MJeA) and salicylic acid (SA) are bio-regulators widely applied on either pre- or post-harvest to extend the shelf life and maintain fruit quality during storage. In this investigation, the possibility of both pre-harvest (7 days before harvesting) via spraying and post-harvest (immediately after harvesting) evaluated by dipping on cantaloupe fruit by either MJeA (3 mM) or SA (3 mM) separately; in combination with MJeA/SA (1.5/1.5 mM/mM) for 30 s. These fruits were kept at 24±0.5 oC for 28 days of storage. In 7 day-interval, fruits were sampled to verify firmness, weight loss, decay rate, total soluble solid, carotenoid, vitamin C, total phenolic content, total flavonoid content. Results revealed that there was a significant difference in quality attributes between the treated samples and the control ones. However, there was no significant difference in quality attributes on either pre-harvest or post-harvest treatments by MeJA and SA reagents. Incorporation of MJeA/SA (1.5/1.5 mM/mM) by either pre-harvest or post-harvest maintained the most firmness (52.10±0.11 N or 52.37±0.08 N), total soluble solid (18.08±0.05 oBrix or 18.15±0.04 oBrix), carotenoid (46.97±0.02 µg/100 g or 47.10±0.03 µg/100 g), vitamin C (26.04±0.02 mg/100 g or 26.17±0.02 mg/100 g), total phenolic content (117.86±0.05 mg GAE/100 g or 119.75±0.09 mg GAE/100 g), total flavonoid content (84.04±0.02 mg QE/100 g or 84.20±0.02 mg QE/100 g) as well as the least weight loss (3.74±0.01% or 3.66±0.03%) and decay rate (1.42±0.01% or 1.26±0.03%) at the end of 28 days of storage. The synergistic effect of MeJA and SA would be a promising alternative to preserve cantaloupe fruit quality with a long shelf life.
Highlights
Horticultural crops are an important source of carbohydrates, proteins, organic acids, vitamins and minerals for human nutrition
To improve the quality properties of cantaloupe fruit, the purpose of our research focused on the implementation of MJeA and Salicylic acid (SA) in either individual or combination in the pre-harvest and post-harvest treatment of cantaloupe fruit in respect of its quality attributes such as firmness, weight loss, decay rate, total soluble solid, carotenoid, vitamin C, total phenolic content and total flavonoid content during 28 days of storage
There was the greatest reduction of Methyl jasmonate (MeJA) vapor at 20 °C for hr before being stored at °C texture firmness on the control (53.72±0.07 N down to for 8 days. 1-100 μmol MeJA treatment effectively con49.75±0.13 N)
Summary
Horticultural crops are an important source of carbohydrates, proteins, organic acids, vitamins and minerals for human nutrition. Methyl jasmonate (MeJA) is contributing important properties in modifying stress reaction and crop growth (1) and enabled numerous protective signaling behaviors to release extra metabolites (2). MJeA is demonstrated to be effective as a natural crop development regulator to activate selfdefense, suppress postharvest dysfunction, amassed phenolics in numerous horticultural crops such as mango, apple, papaya, cherry, blackberry, bayberry, peach, pomegranate, raspberry, strawberry, pear and mandarin (5-17). Salicylic acid (SA) is a naturally effective reagent responsible for retarding ethylene emission, microbial load and fungal dispersion (18-19). SA plays a key role in leaf maturity (20), flowering (21), grain germination (22), provision in root moisture absorption (23), alleviation of thermal stress (24), bio-metabolism of heavy metal residue (25), retardation of chilling injury, adaption to salt tolerance (26), adjustment to cold resistance (27) and in proliferation of reactive oxygen species and nitrogen substances leading to enable various pathways to produce sub metabolites in sequence obtained protection (28). The ultimate impact of salicylic acid on crops was based on its load, species, evolution period and external factors (38)
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