Priming and stress under high humidity and temperature on thephysiological quality of Brachiaria brizantha cv. MG-5 seeds

Thiago   Barbosa Batista; Eliana   Duarte Cardoso; Flávio   Ferreira da Silva Binotti; Edilson   Costa; Marco   Eustáquio de Sá

Priming and stress under high humidity and temperature on thephysiological quality of Brachiaria brizantha cv. MG-5 seeds

Autores

Thiago Barbosa Batista

Eliana Duarte Cardoso

Flávio Ferreira da Silva Binotti

Edilson Costa

Marco Eustáquio de Sá

Editor

Universidade Estadual de Maringá

Descripción

Palisade grass is a forage plant that is widely used in pasture cropping in the Braziliansavannah. The aim of this experiment was to evaluate palisade grass (Brachiaria brizantha cv. MG–5) seedssubjected to priming and stress at high humidity and temperature (before and after conditioning). Theexperimental design was completely randomized in a 2x5 factorial arrangement. Seeds were exposed tostress 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 (GA3)at 0.2% and glucose at 10%] with four replications. Two experiments were performed: Experiment I - seedwith chemical scarification using H2SO4 and Experiment II - without scarification. The stress on the seedwas applied using artificial aging at 41°C for 96 hours. Seed priming was accomplished by immersion at25°C for 2 hours. Thereafter, the seeds were oven-dried at 35°C until they regained hygroscopicequilibrium. Seed germination and vigor were evaluated. Priming using KNO3 and Ca(NO3)2 producedseeds with high tolerance to stress under high temperature, and this process is efficient to overcomedormancy.