Stimulation of germination and physiological potential of rye and triticale by Azospirillum brasilense, submitted to chemical seed treatment

Abstract

TThis study aimed to evaluate the effects of the interaction of inoculation of Azospirillum brasilense with captan and carboxin + tiram fungicides used in seed treatment on the initial development of rye and triticale. The study in two simultaneous experiments was developed at the Universidade Federal da Fronteira Sul, campus Laranjeiras do Sul, Paraná State, Brazil. The design was completely randomized, with eight treatments and four replications. The treatments were: control; inoculant Azospirilum brasilense; fungicide captan; fungicide carboxin + tiram; captan + carboxin + tiram; A. brasiliense + captan; A. brasiliense + carboxin + tiram; A. brasiliense + captan + carboxin + tiram. We evaluated the germination test (4º, 7º/8º days after sowning) and biometric parameters (number of roots; root, shoot and total length; fresh and dry masses). For rye, A. brasilense demonstrated synergistic interaction with captan to root length, whereas for initial germination and shoot length the highest values were observed when bacterium was used alone. The carboxin + tiram provided less value for shoot and root length. For the initial development of triticale, the bacterium showed synergistic interaction when used with carboxin + tiram for aerial part, however, for the variables germination, total length of plant and length and number of roots, the highest values were obtained when A. brasiliense was used alone, so that presence of both fungicides resulted in a smaller increase. Fungicides and A. brasiliense has interaction with germination and development of rye and triticale.