Enhanced yield of tomato in response to 2-(3,4-dichlorophenoxy)triethylamine (DCPTA) |
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Authors: | J. H. Keithly H. Yokoyama H. Gausman |
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Affiliation: | (1) United States Department of Agriculture, Agricultural Research Service, Fruit and Vegetable Chemistry Laboratory, 263 S. Chester Avenue, 91106 Pasadena, CA, USA;(2) Cropping Systems Research Laboratory, Route 3, Box 215, 79401 Lubbock, TX, USA |
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Abstract: | Application of the bioregulator, 2-(3,4-dichlorophenoxy)triethylamine (DCPTA) to tomato (Lycopersicon esculentum Mill. cv. Pixie) significantly increased the vegetative growth and fruit-yield productivities of mature plants. Compared with controls, application of 30 M (10 ppm) DCPTA as a pre-germination seed treatment increased the mean relative growth rates of leaves, stems, and roots, 37%, 16%, and 20%, respectively, during exponential growth. At fruit harvest, the dry weights of leaves, stems, and roots, and the harvestable yield of 30 M DCPTA-treated plants were doubled when compared with controls. Increases in both the total fruit number per plant and the size of individual fruits contributed to the improved yield of 30 M DCPTA-treated plants. The total soluble solids contents of mature fruits harvested from 30 M DCPTA-treated plants were increased 24%, and the lycopene and beta-carotene contents were doubled as compared with controls. These results indicate that DCPTA treatment does not adversely affect the balanced partitioning of photoassimilate to vegetative and reproductive sinks in tomato. |
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Keywords: | bioregulator fruit quality Lycopersicon esculentum relative growth rate total soluble solids |
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