Germinação de sementes e crescimento de plântulas de aveia preta (Avena strigosa) sob concentrações de cádmio

Abstract

When considering the use of residue agricultural products and fertilizers, cadmium and other metals are found in considerable concentrations, which makes it relevant to evaluate their behavior when applied to soil and plants. Considering that oat has been widely used in polution analysis studies.In order to achieve such objectives, a germination test was conducted under a time split-plot and the experimental design was random blocks (DBC), the seeds of each culture were divided in 4 blocks of 16 repetitions of 50 seeds and each repetition was seeded in a Germitest paper substrate, which was previously moistened with a water volume which was 2,5 times greater than the weight of the Germitest paper. The water used in the embibition of the 4 blocks recieved different concentrations of cadmium chloride (CdCl2), in order for the final cadmium concentrations to be 0,0, 25,0, 50,0 e 100,0 mg L-1, which generates four different treatments. The paper rolls were kept in a germinator under illumination and a constant 25ºC temperature, and the evaluations (vigor and viability of seeds, germination speed and growth evaluation) were done in 4 repetitions of each treatment in the fourth, fifth, sixth and seventh days after the seeding. The cadmium didn’t affect the oat’s germination process; however, it was possible to observe a significant difference in the lengths of the aerial part and root between the zero sample (without cadmium addition) and the biggest concentration sample (100mg/L Cd). The zero sample was the one that exhibited a better performance in all of the evaluated criteria, showing that the metal is harmful to the black oat’s development.