Evaluation of Kokum [Garcinia indica (Thouars) Choisy] Genotypes for Growth, Yield and Quality Parameters under the Humid Tropical Conditions of Central Kerala

Abstract

A study was conducted at the Department of Fruit Science, College of Agriculture, Vellanikkara, Kerala Agricultural University, Thrissur, to assess morphological, yield, and biochemical parameters of 29 kokum genotypes. Observations regarding growth, yield, and quality parameters were recorded for all the genotypes. The results showed that genotype IC136687-1 exhibited the highest height (15.60 m), while genotype IC552513 had the lowest height (5.20 m). The highest plant girth was observed in ACC.FSC-1 (156.88 cm), whereas the lowest girth was recorded in IC552522 (25.10 cm). The canopy spread of trees varied from 3.20 m (IC552513) to 8.10 m (ACC.FSC-4) in the East to West direction, and from 3.30 m (IC552513) to 9.42 m (ACC.FSC-9) in the North to South direction. The maximum canopy volume was found in ACC.FSC-9 (1030.01 m3), whereas the minimum volume was observed in IC552513 (57.12 m3). Leaf length ranged from 7.5 cm to 10.24 cm, leaf breadth varied from 3.18 cm to 4.78 cm and leaf area varied from 19.87 cm2 to 34.53 cm2 among different genotypes. Significant difference was recorded with respect to fruit characters among the yielding genotypes. Genotype ACC.FSC-6 exhibited significantly higher fruit weight (40.14 g), fruit volume (45.60 cm³), fresh weight of rind (21.01 g), and dry weight of rind (3.07 g). Conversely, genotype ACC.FSC-3 displayed significantly lower fruit weight (12.17 g), fruit volume (15.10 cm³), fresh weight of rind (7.15 g), and dry weight of rind (1.09 g). The rind to seed ratio ranged from 0.81 to 1.77, while rind thickness varied between 2.46 mm and 3.41 mm. Genotype ACC.FSC-9 exhibited the highest number of fruits per tree (2258) and the highest fruit yield per tree (60.64 kg). On the other hand, genotype ACC.FSC-3 recorded the lowest number of fruits per tree (252) and the lowest fruit yield per tree (3.07 kg). The moisture content varied from 82.91 % to 90.34 %, titratable acidity ranged from 2.30 % to 4.47 %, total sugars ranged from 4.32 % to 10.60 %, TSS ranged from 5.65 °B to 14.15 °B, and anthocyanin content ranged from 11.13 to 25.01 mg per 100 g. Genotypes IC552528-3 and IC336687-3 had significantly high TSS and low acidity were ranked as superior quality genotypes and these genotypes can be utilized for value addition.