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Relation of ascorbic acid concentration in juice of Florida grapefruit to variety, rootstock, and position of fruit on the tree


, : Relation of ascorbic acid concentration in juice of Florida grapefruit to variety, rootstock, and position of fruit on the tree. Jour Agric Res 64(1): 57-61

The ascorbic acid conc. was detd. for 390 individual grapefruits from outside and inside branches of 5 trees each of Marsh grapefruit grown on rough lemon, of Marsh grapefruit grown on sour orange, and of Foster (pink) grapefruit grown on sour orange rootstocks. Fruits from the outside branches from the 3 sources had a consistently higher ascorbic acid conc. This difference was found to be significant at the 1% level. No significant difference in ascorbic acid content was found between Marsh grapefruit grown on rough lemon and sour orange rootstocks, although that on rough lemon was slightly higher. A significantly higher (P = 0.01) ascorbic acid conc. was found in Foster (pink) grapefruit than in Marsh when both were grown on sour orange rootstock. Florida grapefruit from various sources has high antiscorbutic properties; in this expt. the av. ascorbic acid conc. was 0.4 mg./ml. of grapefruit juice.

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