The relationship between parthenocarpy and yield and yield-related traits in eggplant
2010
Koga, T., Fukuoka-ken. Agricultural Research Center, Chikushino (Japan) | Shimomura, K. | Sueyoshi, T. | Mitsui, H. | Hamachi, Y.
Common Japanese eggplant varieties are non-parthenocarpic and need 4-CPA treatment to bear fruit in forcing culture. Performing this treatment is quite time consuming, and culturing parthenocarpic eggplant requires fewer working hours. Therefore, we examined the relationship parthenocarpy and yield and yield-related traits in eggplant in forcing culture. In this study, we used parthenocarpic and non-parthenocarpic doubled haploid (DH) lines that originated by anther culture of Fsub(1) hybrid between 'Chikuyo' or 'Kokuyo', which are Japanese common Fsub(1) varieties, as a seed parent and AE-P03 or AE-P05, which are parthenocarpic pure lines, as a pollen parent. The numbers of flowers and fruit growth percentages of parthenocarpic lines were equal to those of non-parthenocarpic lines. However, the fruit set percentages of parthenocarpic lines were lower than those of non-parthenocarpic lines. Especially, the fruit set percentages of parthenocarpic lines between April on June were over 10 points lower than those of non-parthenocarpic lines. As a result, the yield of parthenocarpic lines was lower than that of non-parthenocarpic lines. These findings suggest that for the breeding of parthenocarpic eggplant varieties, it is important to develop fruit load ability using with hybrid vigor.
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