Parthenocarpic fruit set in triploid watermelon induced by CPPUand 2,4-D applications |
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Authors: | JV?Maroto A?Miguel Email author" target="_blank">S?Lopez-GalarzaEmail author A?San Bautista B?Pascual J?Alagarda JL?Guardiola |
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Institution: | (1) Departamento de Producciòn Vegetal, Universidad Politécnica de Valencia, Camino de Vera 14, 46020, Valencia, Spain;(2) Apartado Oficial, IVIA, 46113 Valencia, Moncada, Spain;(3) Departamento de Biología Vegetal, Universidad Politécnica de Valencia, Camino de Vera 14, 46020 Valencia, Spain |
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Abstract: | The localized application of the synthetic cytokinin CPPU ((2-chloro-4-pyridyl)-N-phenyl urea) to ovaries at flower opening was as effective as free pollination in setting parthenocarpic fruit in the triploid watermelon cultivar ‘Reina de Corazones’, and increased yield per unit land area by at least 50%, simply due to the lack of requirement for diploid pollen producing plants within the orchard. The application of the synthetic auxin 2,4-D (2,4-dichlorophenoxy acetic acid) as a full coverage spray, was also effective in setting fruit; total yield was however 10% smaller than in the CPPU-treated plots, but the cost of application was much less expensive. These applications had no adverse effect on fruit quality, and their effectiveness in commercial watermelon production was evaluated over 4 years. Localized applications of 2,4-D to ovaries were less effective in setting fruit, and increased hollow fruit. |
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Keywords: | Citrullus lanatus Fruit quality Fruit set Fruit yield Growth regulators Triploid watermelon |
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