Effects of melatonin treatment on the postharvest quality of strawberry fruit

توضیحات

ABSTRACT

The effects of exogenous melatonin on postharvest life and quality in strawberry fruit after harvest were evaluated. To explore the optimum concentration of melatonin treatment, strawberry fruit were treated with 0, 0.01, 0.1, 1 and 10 mmol L–1 melatonin for 5 min and then stored at 4 °C and 90% RH for 12 d. The results showed that application of melatonin at 0.1 or 1 mmol L–1 was notably effective in reducing decay and weight loss of fruit. Senescence of strawberry fruit was clearly delayed by the 0.1 or 1 mmol L–1 melatonin treatment, as disclosed by the color, firmness, the total soluble solids content and titratable acidity of the fruit. Melatonin treatment at 0.1 or 1 mmol L–1 significantly reduced the accumulation of hydrogen peroxide (H2O2) and malondialdehyde (MDA), but increased the total phenolics and flavonoid contents, resulting in the higher  ntioxidant capacity. Nevertheless, melatonin treatment had a negative impact on the ascorbic acid content. The optimum concentration of melatonin for extending the postharvest life and improving the quality of strawberry fruit was 0.1 or 1 mmol L–1. Moreover, melatonin treatment at 0.1 mmol L–1 enhanced the expression of melatonin biosynthetic genes including FaTDC, FaT5H, FaSNAT, and FaASMT and consequently increased the content of endogenous melatonin. These findings suggested that melatonin treatment may be a useful technique to extend the postharvest life and improve quality in strawberry fruit.

INTRODUCTION

Strawberry (Fragaria × ananassa, Duch.) fruit is one of the most commonly consumed berries both in fresh and processed forms. It is a rich source of a wide variety of nutritive compounds such as sugars, vitamins and minerals, as well as bioactive compounds such as ascorbic acid, carotenoids, phenolic compounds and folates, most of which are natural antioxidants and contribute to the high nutritional quality of the fruit (Tulipani et al., 2011; Giampieri et al., 2015). All of these compounds exert a synergistic and cumulative effect on human health promotion and in disease prevention. Strawberry fruit is a non-climacteric fruit and should be harvested at full maturity stage in order to get the maximum marketing quality. This fruit is also highly perishable, due to high respiration rate, low mechanical resistance, and high susceptibility to the pathogen attack (Hashmi et al., 2013; Neri et al., 2014). Undesirable changes observed during postharvest include desiccation, loss of flesh firmness, mechanical injury, and Botrytis cinerea induced decay (Charles et al., 2009; Pombo et al., 2009). 

Year: ۲۰۱۸

Publisher : ELSEVIER

 By : Changhong Liu, Huanhuan Zheng, Kangliang Sheng, Wei Liua, Lei Zheng

File Information: English Language/ 9 Page / size: 1.06 MB

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سال : ۱۳۹۶

ناشر : ELSEVIER

کاری از : چانگ هونگ لیو، هوانهان ژنگ، کیانگ لیانگ شنگ، وی لیوا، لی ژنگ

اطلاعات فایل : زبان انگلیسی / 9 صفحه / حجم : MB 1.06

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