Fruit Set and Fruit Growth of 'Irwin' Mango as Affected by Honeybee Pollination.

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  • ‘アーウィン’マンゴーにおける着果と果実の肥大発育に及ぼすミツバチ受粉の効果
  • アーウィン マンゴー ニ オケル チャッカ ト カジツ ノ ヒダイ ハツイク

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Abstract

In 4-year-old trees of‘Irwin’mango grown in a plastic house, panicles were pollinated with honeybees and some of them were free from honeybee pollination by bagging with a cheesecloth during flowering. The percentage of pollen grains adhering onto the stigma surface, embryo or seed formation, initial fruit set, fruit enlargement, and number of harvested fruits were investigated in the panicles of the two treatments to clarify the effect of honeybee pollination on productivity.<BR>In the honeybee pollination plot, pollen grains adhered onto the stigma surface in many flowers and some of them extended tubes into ovaries, while few flowers were pollinated in the plot free from honeybees. However, differences in the initial fruit set as well as number of harvested fruits between the treatments were not conspicuous. Pollination itself presumably is not directly related to the fruit set of‘Irwin’mango. Honeybee pollination promoted embryo or seed formation. In the panicles free from honeybees, all the harvested fruits were seedless and smaller than the seeded fruits obtained by honeybee pollination. These results suggest that honeybees as a pollinator increase the yield through the production of a larger number of seeded fruits with a larger size.

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