Fruit size and shape relationship in Satsuma mandarin

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  • 温州ミカンの果実の肥大と果形指数
  • ウンシュウ ミカン ノ カジツ ノ ヒダイ ト カケイ シスウ

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Abstract

To observe growth of satsuma mandarin fruit classified by shape index (transverse diameter/longitudinal diameter) was carried out, in relation to leaf number per bearing shoot and per fruit. The results were summarized as follows. 1. There were significant correlations with fruit size and shape of mature fruits on adult trees. The larger fruits showed to be oblate. The fruits with many leaves on the bearing shoot were large in size and high in shape index. 2. Diameters of different shape of young fruits were measured throughout the growing season. The oblong or oblate young fruits grew up to be the same shape of matured ones. This tendency was significant on leafless fruits. 3. Daily changes of the fruit shape index were investigated on a fine day of early July to November. The young fruits showed larger changes in shape index. When the fruits neared to maturity, the changes in index became small. All fruits were oblate in the afternoon and oblong in the early morning. 4. Eighty-year-old trees with 10, 20, 30, 40 and 50 leaves per fruit were investigated on the fruit growth. The more the leaves per fruit, the larger the fruits harvested were. The trees with 30 leaves per fruit produced the most oblate fruits.

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