Artículos de revistas
Priming and stress under high humidity and temperature on the physiological quality of Brachiaria brizantha cv. MG-5 seeds
Fecha
2016-01-01Registro en:
Acta Scientiarum-agronomy. Maringa: Univ Estadual Maringa, Pro-reitoria Pesquisa Pos-graduacao, v. 38, n. 1, p. 123-127, 2016.
1807-8621
10.4025/actasciagron.v38i1.26021
S1807-86212016000100123
WOS:000371225500014
S1807-86212016000100123.pdf
0756504113273662
Autor
Universidade Estadual de Mato Grosso do Sul (UEMS)
Universidade Estadual Paulista (Unesp)
Institución
Resumen
Palisade grass is a forage plant that is widely used in pasture cropping in the Brazilian savannah. The aim of this experiment was to evaluate palisade grass (Brachiaria brizantha cv. MG-5) seeds subjected to priming and stress at high humidity and temperature (before and after conditioning). The experimental design was completely randomized in a 2x5 factorial arrangement. Seeds were exposed to stress under high humidity and temperature (before and after conditioning) and five priming treatments [Water (Control), potassium nitrate (KNO3) at 0.2%, calcium nitrate Ca(NO3)(2) at 0.2%, gibberellin (GA(3)) at 0.2% and glucose at 10%] with four replications. Two experiments were performed: Experiment I - seed with chemical scarification using H2SO4 and Experiment II - without scarification. The stress on the seed was applied using artificial aging at 41 degrees C for 96 hours. Seed priming was accomplished by immersion at 25 degrees C for 2 hours. Thereafter, the seeds were oven-dried at 35 degrees C until they regained hygroscopic equilibrium. Seed germination and vigor were evaluated. Priming using KNO3 and Ca(NO3)(2) produced seeds with high tolerance to stress under high temperature, and this process is efficient to overcome dormancy.