Aluminum content (Al) available in soil solution with high acidity is one of the abiotic factors that strongly intervenes with the growth and development of black oat (Avena strigosa Schreb.). After its assimilation, cells and organelles are affected at morphological, cytogenetic and physiological levels, causing low plant grain yields. In this study, black oat genotypes were subjected to aluminum stress under hydroponic conditions to determine the most effective character for the selection of seedlings in controlled environment. Moreover, other objectives were to characterize distinct genetic compositions of black oats aiming the establishment of crossing blocks; to improve the accuracy of genotype recommendation for environments with high presence of this chemical element, and to establish the aluminum concentration that allows the scoring of aluminum tolerance under hydroponic conditions. Adopting the Camargo and Oliveira, in 1981, methodology, five aluminum levels: 0, 5, 10, 20 and 40 mg L-1, with addition of Al2(SO4)3.18H2O, were used. The experimental design was complete randomized blocks with three replications in 5 x 10 factors (dose x genotype). The character root length and the doses 10 and 20 and mg L-1 of Al3+ provided the best differentiation between the genotypes regarding aluminum tolerance and sensibility. The black oat cultivar IAPAR 61 evidenced high aluminum sensibility, contrasting with genotypes PRETA COMUM and EMBRAPA 140, which expressed high tolerance in the presence of the toxic element in the culture environment.
Avena strigosa Schreb.; nutrient solution; seedling characters; tolerance; sensibility
