Abstract
The aim of this study was to evaluate the concentrations of sodium nitroprusside (SNP), a nitric oxide donor, on postharvest ripening and quality of mango fruit cv. Nam Dok Mai No.4. The fruits were dipped in 1 or 2 mM of SNP solution for 30 min while control fruits were dipped in tap water for 30 min. After treatment, all fruits were stored for 18 days at 13°C and RH 90%. Both SNP doses showed significantly reduced ethylene production and respiration rate, maintained the fruit firmness, decreased the changes in total soluble solids and titratable acidity, and reduced fruit weight loss. The treatments of SNP also delayed color development in fruit peel and pulp. SNP-treated fruits showed higher L* and hue angle values and lower a* and b* values in comparison with control fruits. No significant differences were found between 1 and 2 mM SNP treatments. SNP applying on dose of 1mM to postharvest ‘Nam Dok Mai No.4’ mango fruits and then stored at 13°C changed ethylene production and respiration rates, maintained firmness pulp, decreased weight loss and slowed the changes in fruit peel and pulp color, total soluble solids (TSS) and titratable acidity (TA). Key words: Mangifera indica L., sodium nitroprusside, biochemical changes, fruit quality.
Highlights
Nitric oxide (NO) is recognized as a biological messenger in plants
sodium nitroprusside (SNP) applying on dose of 1mM to postharvest ‘Nam Dok Mai No.4’ mango fruits and stored at 13°C changed ethylene production and respiration rates, maintained firmness pulp, decreased weight loss and slowed the changes in fruit peel and pulp color, total soluble solids (TSS) and titratable acidity (TA)
We found that 0.5 mM SNP did not have clear effect on mango quality during storage, and 4 mM SNP caused the damage to mango fruit skin)
Summary
Nitric oxide (NO) is recognized as a biological messenger in plants. It is a highly reactive gaseous free radical and is soluble in water and lipid (Hayat et al, 2010). NO can mediate various pathophysiological and developmental processes, including the expression of defence-related genes, programmed cell death, stomatal closure, seed generation and root development (Neill et al, 2003). Optimum NO levels could delay the climacteric phase of many tropical fruits and prolong the post-harvest shelf life of a wide range of horticultural crops by preventing ripening and senescence (Singh et al, 2013). NOfumigated fruits reduced ethylene production due to binding of NO with 1-aminocyclopropane-1-carboxylic acid (ACC) and ACC oxidase to form a stable ternary complex, limiting ethylene production (Tierney et al, 2005).
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