In response to the issues of difficult storage and decreased hardness of blueberries after picking, this experiment used blueberries as materials and treated them with different concentrations of melatonin (0, 50, 100, and 150 mg·L–1). The hardness, pectin content, pectin methylesterase (PME) activity, polygalacturonase (PG) activity, pectin lyase (PL) activity, β-galactosidase (β-GAL) activity, degree of pectin methylation, β-eliminating reaction degree, H2O2 and malondialdehyde (MDA) content were measured to explore the mechanism of melatonin's effect on blueberry fruit preservation. The results showed that different concentrations of melatonin treatment could delay the decrease of blueberry hardness, but the effect was not significant when the treatment concentration was low (50 mg·L–1). The 150 mg·L–1 melatonin treatment had the best preservation effect on blueberry fruit, maintaining pectin content and inhibiting PG, PL, PME, and β-GAL activity of cell wall degrading enzymes, reducing the demethylation of pectin. These results indicated that melatonin could delay the degradation of cell wall polysaccharides by inhibiting enzyme activity, which was feasible for post harvest preservation of blueberry fruits.
孙萌萌，陶乐仁
. Effects of Different Concentrations of Melatonin Treatment on the Hardness and Pectin of Postharvest………
Blueberry Fruits[J]. Subtropical Plant Science, 2023
, 52(6)
: 475
-480
.
DOI: 10.3969/j.issn.1009-7791.2023.06.002
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