CPPUとGA<SUB>3</SUB>の混合処理が‘アーウィン’マンゴー果実の肥大生長に及ぼす影響

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  • Effect of Combined Application of CPPU and GA3 on the Growth of 'Irwin' Mango Fruits.

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The effect of the combined application of solutions of CPPU and GA3 on fruit growth was investigated in ‘Irwin’ mango. Two applications of 10ppm or 20ppmCPPU plus 100ppm GA3 to whole panicles from the full bloom stage caused abnormal fruit growth and no fruit set could be obtained. When the same treatments were applied from the end of the flowering time, fruit growth was not appreciably affected and the TSS contents of the fruits decreased. Spraying of 10ppm CPPU plus 100ppm GA3 to panicles twice and 4 times from the end of the physiological fruit drop stage promoted fruit growth. The effect was more pronounced with 4 applications than with 2 applications. Total yield per tree increased because of the increase in the average weight of both seeded and seedless fruits and the number of harvested seedless fruits increased with 4 applications. The ratio of bigger-seeded fruits weighing of more than 400g was about 60% of that of the total number of harvested fruits with 4 applications, followed by nearly 45% with 2 applications and about 25% in the control. Spraying the solution 4 times increased the ratio of seedless fruits weighing more than 200g but did not produce any seedless fruits weighing more than 400g. More frequent applications of the solution to panicles tended to delay the fruit maturity as well as to decrease the sugar content in ripened fruits. These results indicate that the combined application of 10ppm CPPU plus 100ppm GA3 from the early stage of fruit growth, which promoted fruit enlargement, has a potential to increase the commercial value of ‘Irwin’ mango fruits, but at the same time the treatment may decrease the quality of ripened fruit.

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  • 熱帯農業

    熱帯農業 46 (4), 224-229, 2002

    日本熱帯農業学会

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