モモの単為結果および果実の肥大におよぼすジベレリンの影響

清川 薫雄, 中川 昌一

doi:10.2503/jjshs.41.133

Induction of parthenocarpy in Japanese cultivars of the peach was demonstrated. Among several growth regulators examined, GA₃ was only effective to induce parthenocarpic fruit in Okubo cultivar, when it was applied at a concentration of 500 or 1000ppm at the balloon stage. Moreover, GA₃ was effective to induce parthenocarpy in 3 of the 6 cultivars tested, but had no effect on the ramaining 3 cultivars. It was also found that the percentage of parthenocarpic fruit set increased with increase in a concentration of GA₃, and higher percentages of parthenocarpic fruit set were obtained in repeated applications of GA₃. No effects were obtained in the growth of parthenocarpic fruit for three concentrations of GA₃ when it was applied only once at the balloon stage, but pronounced effects were found in parthenocarpic fruit growth when GA₃ was applied repeatedly during the early stage of fruit growth, even if it was applied at a low concentration. Fruit quality of parthenocarpic fruit induced by GA₃ was almost identical to those of pollinated fruit, although fruit size and weight were smaller than the pollinated fruit. It was also shown that non-pollinated peach fruit will continue their further growth when GA₃ at a concentration of 1000ppm was applied within 30 days after emasculation, but not thereafter. Morphological observations showed that there were little or no differences in mesocarp thickness between seeded and parthenocarpic fruits, although some differences in cell number and cell size were found between them. While, tissue thickness of pits and pit cavity in the parthenocarpic fruit were smaller than those of the seeded one.

モモの単為結果および果実の肥大におよぼすジベレリンの影響

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モモの単為結果および果実の肥大におよぼすジベレリンの影響

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