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ISHS Acta Horticulturae 614: VI International Symposium on Protected Cultivation in Mild Winter Climate: Product and Process Innovation

GREENHOUSE PRODUCTION OF DIPLOID WATERMELON WITHOUT BIOLOGICAL POLLINATION

Authors:   F. Camacho Ferre, E.J. Fernández Rodríguez, M. Díaz Pérez
Keywords:   citokinins, auxins, 2,4 dichlorophenoxyacetic acid, 1-(2-chloro-4-pyridyl)-3-phenylurea, plant growth regulators, fruit setting.
DOI:   10.17660/ActaHortic.2003.614.39
Abstract:
A trial was conducted growing diploid watermelon cv. Sweet Marvel (S&G) without honeybee pollination in a typical ´parral´ greenhouse in Campo de Níjar, Almería, Spain. The area of the trial was completely isolated by means of a photoselective 50 mesh anti-insect net. The effects of two different plant growth regulators, 2,4 dichlorophenoxyacetic acid (2,4 D) (amine salt) and forchlorfenuron [1-(2-chloro-4-pyridyl)-3-phenylurea or CPPU] on yield and seedless fruit induction were analysed. Experimental design consisted of completely randomised blocks. Six treatments were used: 8, 12 and 16 ppm of 2,4 D, and 50, 100 and 200 ppm of CPPU. CPPU treatments were sprayed only over female flowers at two different moments whereas 2,4-D was sprayed over the entire plant in a single treatment. Yield was significantly affected by the treatments. As the dosage of 2,4 D increased yield was reduced, though the opposite trend was found when considering CPPU. The highest yield was found at 200 ppm CPPU with 5.14 kg m-2, and the lowest at 50 ppm CPPU. The highest proportion of seedless fruits was found in 200 ppm CPPU, 97.8 %, showing statistical differences with 50 and 100 ppm CPPU which only yielded 58.1 % and 60.2 % respectively, but not with any of the 2,4 D treatments.

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