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Effects of gibberellins on morphology and productivity of bean (Phaseolus vulgaris L. cv. 'Carioca')

Seedlings of (Phaseolus vulgaris L. cv 'Carioca') were treated, 7 days after germination, with gibberellins in the concentrations of 50, 500 and 1000 ppm and the check treatment, to verify the affect of the gibberellins on the morphology and productivity of the bean plant. The experiment was made under greenhouse conditions during year of 1972. The most effective treatment with the gibberellins were obtained with the concentrations of 500 and 50 ppm and excepting with the concentration of 500 ppm in which one a negative result was related with the length of leaves. There was an affective increase of elongation in the stem of the plants treated with the gibberellins. Significant differences related to the length of the internodes occurred during the first thirty-one days of growth and no significant differences were obtained after that period in the plants with gibberellins. It was also verified in all treated plants there was a little increase in the number of internodes and in the number of leaves. According with the number of flowers it was noted there was a tendency to increase the number of them at the concentrations of 500 and 50 ppm of gibberellins, however the production of the beans was not significant.


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