Condicionamento fisiológico de sementes de couve (Brassica oleracea var. acephala) com bioestimulantes à base de algas

Abstract

Cabbage (Brassica oleracea var. Acephala) belongs to the botanic family Brassicaceae, an important leafy vegetable. The seed physiological performance is fundamental for the crop establishment. One seed treatment technique that can contribute to the improvement of the physiological potential is seed priming. The objective of this work was to evaluate the effect of cabbage seed priming with algaae biostimulants. The experimental design was completely randomized, with a 2 x 4 factorial scheme (biostimulants x doses), with five replications. The treatments consisted of algae biostimulants (Ascophyllum nodosum and Solieria sp.) and doses of 0; 0.25; 0.50; 1.0 mL L-1 water. Seed soaked curves were used to determine the ideal priming period. The effect of the treatments was evaluated by sanity test, germination percentage, radicle protrusion speed index, shoot and root seedling length and root and shoot seedlings dry mass, under optimum temperature conditions (20 °C) and stress (30 °C). The results were submitted to analysis of variance and regression. The period of 22 hours of soaked is adequate for the conditioning of cabbage seeds with biostimulants based on Ascophyllum nodosum and Solieria sp. The conditioning of cabbage seeds with Ascophyllum nodosum and Solieria sp. does not interfere with seed health. In general, the use of algae biostimulants demonstrated that it is possible to improve the physiological performance of cabbage seeds under ideal conditions of temperature, but it was not able to mitigate the effects of high temperature stress.