Resumo

NINO-HERNANDEZ, Juan Camilo et al. Light, gibberellins and burial depth affect seed germination of Amaranthus hybridus L. rev.udcaactual.divulg.cient. [online]. 2020, vol.23, n.2, e1545.  Epub 30-Jul-2020. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v23.n2.2020.1545.

Amaranthus hybridus L., known as bledo, is a weed in a wide variety of crops worldwide, characterized by producing high number of seeds with dormancy. To generate sustainable management strategies of this species, it is necessary to better understand the physiology of its seeds. Therefore, the objective was to evaluate the effect of light, gibberellins, and seed burying depth on seed germination of bledo. In the first experiment, four light conditions were evaluated (red, blue, without light and natural light (control)), in the second experiment the seeds were imbibed in different concentrations of gibberellic acid (0, 200, 400 and 800mg L-1 of GA3), and in the last experiment, 8 planting depths were evaluated (10, 20, 30, 40, 50, 60, 70 or 80mm) using peat as a substrate. A higher percentage of seed germination in darkness was found, indicating that this species had negative photoblastic seeds. For the gibberellin experiment, the best result was obtained with treatment with 400 and 800mg L-1 of gibberellic acid. In the third experiment, a high percentage of seedling emergence was observed from the first depths (10mm to 30mm); the greater was the depth, the less emergence was found. The differential responses to light, the application of gibberellins, and the high percentage of non-germinated viable seeds allowed to conclude that bledo seeds possess physiological dormancy.

Palavras-chave : Tetrazolium; Dormancy; Hormones; Photoblastic seeds; Weed management.

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