Leaf-to-fruit ratio affects water and dry-matter content of mango fruit

摘要

Changes in water and dry-matter content of developing mango fruit (Mangifera indica cv. Lirfa) were investigated over a single season in Reunion Island, along with the effects of leaf:fruit ratio (10, 25, 50, 100 and 150 leaves per fruit on girdledbranches). As the fruit developed, about 8-13% of fruit water weight was in the peel compared with 78-86% in the pulp and 6-9% in the stone. When the data were expressed on a dry-weight basis, 12-20% was in the peel, 60-70% was in the pulp and 18-20% inthe stone. At harvest, larger fruit, on treatment 100, had a higher proportion of weight in the pulp. Good relationships between water and dry weight of each fruit component were found, regardless of the treatment. They showed that the rate of water accumulation decreased when the dry weight increased and that the dry-matter content increased as the fruit developed as well. Increasing leaf:fruit ratio to 100 leaves per fruit improved fruit yield by 300 g and pulp dry-matter content by 6%, for a total of550 g and 20% at harvest. Fruit quality as estimated by pulp dry-matter content could be calculated easily during the changes in fruit weight over the season. Moreover, this indicator could be useful to assess the maturity of mango fruit.