Effect of Different Fruit Size and Dry Matter Production on Fruit Load and Fruit Set Ratio in a Greenhouse Sweet Pepper

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  • 物質生産および1果重の違いがパプリカの着果負担および着果率へ与える影響

Abstract

<p>The fruit set ratio in a greenhouse sweet pepper (Capsicum annuum) fluctuates with peaks and troughs during cultivation, and fresh fruit yields also fluctuate. The main causes of this phenomenon may be the amount of dry matter production and fruit sink strength: source-to-sink relationship. However, this theory has not been sufficiently investigated in a wide range of cultivars with different fruit sizes. Therefore, we examined the relationship between the fruit set ratio and source-to-sink ratio of four sweet pepper cultivars (‘Artega’, ‘Nagano’, ‘Nesbitt’, and ‘Trirosso’) under a rockwool system for 250 days. Medium to large fruit cultivars showed marked fluctuations in fruit set ratio and source-to-sink ratio, compared with small ones. Regression curves between the source-to-sink ratio and fruit set ratio in each cultivar were significant (P < 0.001), and they showed different tendencies among cultivars. In conclusion, stabilizing the source-to-sink ratio of each cultivar based on the fruit size might mitigate fluctuations in fresh fruit yields.</p>

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