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Possible role of plasmatic membrane into softening process of 'Manila' mango (Mangifera indica L.)

Vazquez-Celestino, D., Rosa, A. P. Barba de la, Vara, L. E. Gonzalez de la, Vazquez-Barrios, M. E., Mercado-Silva, E.
Acta horticulturae 2018 no.1194 pp. 439-444
Mangifera indica, cell walls, choline, coatings, cultivars, electrolytes, firmness, fruits, lipid peroxidation, mangoes, models, plasma membrane, polysaccharides, postharvest physiology, postharvest treatment, sensory properties, shelf life, weight loss, Mexico
Mexico is the first exporter of mango (Mangifera indica) of different cultivars and postharvest behaviors, such as fast loss of firmness. This factor is one of the most critical quality attributes influencing the shelf life and consumer appeal.'Manila' mango, with high sensory quality, shows a fast softening during postharvest that limits its shelf life. In addition to the general idea that softening results from the enzymatic degradation of cell wall polysaccharides, recent studies suggest that softening is a multifactorial process, among which the integrity/functionality of the plasma membrane plays an important role. In previous work in our research group, we evaluated the effect of postharvest treatments to prevent the softening and with these results establish a model to study the softening process under two opposite conditions, firm and soft fruit. We found that wax coating was the best treatment to delay the softening process and this treatment was used to establish the model of study. The aim of this study was to understand the role of plasma membrane integrity during the softening process of 'Manila' mango. A sample of 108 fruits harvested at 75% maturity was treated with and without wax coating. Fruits were stored for 9 d at 20°C. The results showed a clear relationship between weight loss and firmness but the electrolyte leakage, lipid peroxidation and PLD activity (26.77-28.93%, 4.69e(-6)-3.08e(-6) μm cm-1 and 5.46e(-4)-4.67e(-4) μm of choline for control and wax coating, respectively) did not show a clear evidence of deterioration of the plasma membrane, because there was no significant difference between treatments. These findings suggest that the hydric relations in fruits play an important role in the softening process.