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ISHS Acta Horticulturae 918: XXVIII International Horticultural Congress on Science and Horticulture for People (IHC2010): III International Symposium on Plant Genetic Resources

GENETIC RESOURCES OF PUMMELO (CITRUS GRANDIS OSBECK) IN WEST BENGAL, INDIA

Authors:   S.K. Mitra, C.S. Maity, B. Ghosh, P.K. Pathak
Keywords:   Rutaceae, citrus, clone, variability, heritability
Abstract:
Survey for selection of elite clones of pummelo was initiated in 1999. Since then more than 700 trees were evaluated and 15 elite clones were identified as superior clones. Wide variability in yield (84-315 fruits per tree), fruit weight (570-2010 g), fruit shape, peel color, number of segments per fruit (12-16), number of seeds per fruit (67-182), total soluble solids (9-11.4°Brix), total sugar (4.6-6.1%) and fruit acidity (0.44-1.38%) was observed among the genotypes. Genetic variability studies for fruit characters of 15 selected genotypes reveals that variability was wide for fruit weight, peel weight, peel thickness, color of juice sac, number of segments, number of seeds, segment weight, and fruit acidity. High heritability estimates coupled with high genetic advance was estimated for TSS/acid ratio of fruit, peel weight, seed number, seed weight, fruit acidity as well as fruit weight and segment weight, suggesting that further selection for improvement in fruit weight, segment weight, acidity and TSS/acid ratio would be effective. The 15 selected clones show important agronomic features such as: early ripening (matures in July): P4, P132, P602 and P639; late ripening (matures in September): P15, P38, P323, P411 and P617; higher yield: P15, P46, P476, and P617; good quality to use as fresh fruit: P15, P18, P38, P323 and P411 and high juice content suitable for processing: P7, P22, P602, and P639.
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