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Citrus industry of Pakistan is dominated by Kinnow mandarin while grapefruit cultivation, despite having enormous
nutraceutical properties, is negligible and concentrated by pigmented cv. Shamber only. Hence, fruit of six elite pigmented
grapefruit cultivars viz. Flame ‘F’, Pink Ruby ‘PR’, Red Blush ‘RB’, Rio Red ‘RR’, Star Ruby ‘SR’ and Shamber ‘S’ were
evaluated for physico-chemical quantitative and morphological qualitative traits. Fruit of all genotypes had similar spheroid
shape, with convex base and truncate apex. Fruit size and weight were higher in ‘F’ (455 g) and ‘RR’ (366 g) while ratio FL:FD
was more in ‘S’, ‘SR’ and ‘PR’. Peel was markedly thin in both ‘SR’ and ‘PR’ varieties. Developed seeds were minimum (2.2)
in ‘PR’. Among quantitative traits, total soluble solids (TSS) were higher in ‘SR’ (8.51 °Brix) followed by ‘PR’ (8.87 °Brix).
Ratio TSS:TA (6-7.8) and ascorbic acid contents (61-73 mg/100g) were higher in ‘RB’ and ‘PR’. Anthocyanins were
remarkably higher 0.82 mg/100g in ‘RB’ followed by ‘PR. Total sugars were much higher (5.3%-5.6%) in ‘FS’, ‘PR’ and ‘SR’
as compared with ‘S’. Pearson’s correlation analysis revealed strong positive correlations among fruit diameter and fruit
weight, fruit weight and acidity, peel thickness and sugars while acidity and anthocyanins were negatively correlated. These
findings indicate good potential of ‘PR’, ‘RB’ and ‘SR’ varieties compared with ‘S’ which is no more a commercial variety in
the leading grapefruit producing countries. Further studies are suggested for comparative analysis of pigmented and nonpigmented varieties for genotypic diversification and breeding programs.
Muhammad Usman, Waqar Rehman, B. Fatima, Muhammad Shahid, Akbar H. Saggu, M. Awais Rana, Arooge Fatima. (2020) 3 and Muhammad Yasin Ashraf, Pakistan Journal of Agricultural Sciences, Volume 57, Issue 4.
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