Ozonation of quinoa seeds (Chenopodium quinoa Willd.): saturation and decomposition kinetics of ozone and physiological quality of seeds

Abstract

Ozonation has been evaluated as an alternative method for seed treatment. In this context, the goal of this study was to evaluate the saturation process and kinetics of decomposition of ozone in a porous medium composed of quinoa BRS Syetetuba and possible changes in seed quality. Ozone concentration and saturation time in the porous medium and half-life were determined by adopting an inlet ozone concentration of 885 ppm and a flow rate of 5.0 L min-1 at 25 °C. The ozonation periods adopted were 0, 30, 60, 90, and 120 min. Regarding the physiological quality of the seeds, the germination percentage, germination speed index, electrical conductivity, and length of the shoot, root, and normal seedlings were analyzed. At the inlet ozone concentration of 885 ppm and a flow rate of 5.0 L min-1, the saturation concentration and saturation time in the porous medium composed of quinoa were 522.5 ppm and 12.0 min, respectively. The half-life of ozone in the porous medium was 6.08 min at 25 °C. Under these conditions, ozonation did not affect the physiological quality of quinoa BRS Syetetuba seeds for up to 120 min.

Caracterización físico-química y capacidad antioxidante de progenies de quinua originarias de Colombia, Brasil y Ecuador producidas en la Sabana Brasileña

“…It has a cycle of around 120 d, an average plant height of 180 cm, cylindrical and flattened grains with a white pericarp surrounded by the perigone, which opens during maturation. The seeds have high quality with tolerance to high-stress environments (Alencar et al, 2021), an average weight of 2.5 and 3.3 g (weight of 1,000 grains) in summer and winter crops, respectively, containing up to 18% of protein, grain yield of 2.3 t ha -1 , and dry matter of 7.5 t ha -1 . It has no pigmentation (Spehar et al, 2011).…”

Hybridization between progenies and agronomic characterization of the F2 generation in quinoa

“…It has a cycle of 120 days, an average plant height of 180 cm, grains with a white pericarp covered by the perigonium, which opens during maturation. The seeds have high quality and tolerance to high-stress environments (Alencar et al 2021), an average weight of 2.5 g and 3.3 g (weight of 1000 grains) in summer and winter crops, respectively, containing up to 18 g 100 -1 g of protein, grain yield of 2.3 t ha -1 , and dry matter of 7.5 t ha -1 . It has no pigmentation (Spehar et al 2011).…”