Effects Of Heating And Sulfuric Acid On Seed Dormancy Of Brachiaria Dictyoneura Cv. Llanero.
(Almeida, Clodoaldo Rocha de)
Effects of heating and sulfuric acid on seed dormancy of Brachiaria dictyoneura cv. Llanero.Seed dormancy is emphasized in the literature as a problem for theestablishment of tropical pasture grasses. Immersion of seeds insulfuric acid (H2SO4) has been widely used and is effective in breakingdormancy of Brachiaria seeds, although this treatment raisesinconveniences relating to the operator safety during application.Moreover, refusal of residues from this chemical treatment may becomeharmful to the environment. This essay aims to evaluate alternativeseed treatments for overcoming dormancy, comparing physiologicaleffects from heating treatments (55, 65, 75 and 85 o C, for 5, 10 and15 hour) and chemical scarification (immersion in H2SO4 for 15 minutes)in seeds of Brachiaria dyctioneura cv. Llanero (Brachiaria humidicolacv. Llanero, according to Renvoize et al., 1996). Therefore, seeds wereevaluated for their quality attributes (water content, germination,tetrazolium, first count of germination, seedling emergence, shootlength of seedlings, and emergence speed index), twice during theexperiment (in the beginning and at the end of a six-month storage).Heating and sulfuric acid are alternative treatments for overcomingseed dormancy, consequently favoring physiological performance.However, particularly for the heating treatment, seed deterioration maybe accelerated during storage.
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