Effect of harvest time on physicochemical changes in fruit of some orange genotypes compared with the commercial orange cultivar Mars (Citrus sinensis cv. Mars)

Document Type : Original Article

Authors

1 PhD. Student in Plant Physiology, Department of Biology, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran.

2 Associate Professor, Department of Biology, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran.

3 Citrus and Subtropical Fruits Research Center, Agricultural Research Education and Extension Organization (AREEO), Horticultural Science Research Institute, Ramsar, Iran

4 Assistant Professor, Department of Biology, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran.

5 Assistant Professor, Department of Biology, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran .

10.30466/rip.2023.54710.1281

Abstract

Citrus fruits are among the important crops of tropical and subtropical regions, and among them, orange has the largest cultivated area because of its high nutritional value. Due to the abundance of natural and artificially generated hybrids and genotypes in citrus, the identification and selection of superior genotypes are highly important. The present study was conducted in 2020 to investigate the physicochemical characteristics of fruit from some orange-like genotypes at different ripening stages. For this purpose, four orange genotypes (G3, G4, G5, and G6) along with the control (Mars orange) were harvested at three times at 30-day intervals, from 20 November to 20 January, and evaluated for several physicochemical traits. The results showed that delaying fruit harvest significantly increased fruit morphological traits, including weight, length, diameter, and volume, as well as juice content, TSS, TSS/TA ratio, and the a* and b* indices of fruit peel color in different orange genotypes. In contrast, TA and the L* and chroma indices significantly decreased with delayed fruit harvest. Genotype G6 showed better performance in terms of fruit dimensions [weight (201.03 g), length (75.84 mm), diameter (77.18 mm), and volume (225.38 cm³)], juice content (86.23%), and flavor desirability [lower TA and higher TSS/TS ratio (15.61)]. Finally, cultivation of genotype G6 and harvesting its fruit on 20 December can be recommended for the production of high-quality orange fruit.

Keywords


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