Effect of pre-harvest covering fruit on some physicochemical properties and quality of pomegranate fruit cv. Shishe Kab
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Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
Background and objectives
The pomegranate is native to tropical and subtropical regions. Therefore, the intensity of solar radiation and high temperatures in the warm seasons cause physiological disorders and loss of product quality. Therefore, the purpose of this study was to assess the effect of the covering fruit (bagging) and covering time (early July and early August) with different colors of the textile bag (white and light brown) on the physicochemical properties of Shishe Kab pomegranate cultivar.
Materials and methods
This experiment was performed in Ferdows city, in a randomized complete block design with four replications and five fruit in each replication. Treatments included: control (non-bagged fruit), fruit covered with a white bag in July, with a light brown bag in July, with a white bag in August and with a light brown bag in August.
Results
The results showed that coverage decreased the cracking percentage of fruit so that the highest cracking percentage (56.2%) was observed in non-covered fruits (control) and the lowest (7.03%) in fruits covered with a light brown bag in August. The percentage of aril browning in covered fruits compared to the control showed a significant difference which the highest aril browning (20.13%) gained in covered fruits with a white bag in August and the lowest (1.66%) gained in non-covered fruits. The highest skin lightness was observed in fruits covered by the light brown bag in August and the lowest in fruits covered with the white bag in July. Covering fruit had no significant effects on fruit juice weight, volume, and density, fresh weight, and thickness of the skin, compared to the control. However, covering time had a significant effect on the juice weight and volume so that the maximum weight and volume of juice was observed in July. Covering fruit reduced juice anthocyanins. Non-covered fruits (control) had the highest amount of anthocyanin and fruits covered with the light brown bag in August had the lowest amount of anthocyanin. Coverage fruit had a significant effect on antioxidant activity reduction of juice. Results showed that the highest antioxidant activity was obtained in non-covered fruits and the lowest was in fruits covered with a light brown bag in August.
Conclusions
Good quality of the product by reducing cracked fruits increase the price of the product and also its marketability. In addition, cracked fruits are unsuitable for the market and storage. Interestingly, covering fruit can reduce this disorder to some extent. However, in this study, anthocyanin and antioxidant values which are the most common indicators of nutritional and medicinal of pomegranate fruit reduced by high temperatures and low radiation. Nevertheless, with the proper selection of cover type, color and the covering time and removing time of the bag before harvest, not only a good appearance and quality, but also desirable nutritional and medicinal aspects can be achieved
Language:
Persian
Published:
Journal of Plant Production, Volume:25 Issue: 2, 2018
Pages:
139 to 152
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