Morfogênese de espécies do gênero Brachiaria durante as estações do ano

Abstract

The present work was carried out with the objective of evaluating the morphogenesis of four forage grasses species of Brachiaria genus: signalgrass (Brachiaria decumbens), humidicolagrass (Brachiaria humidicola), ruziziensisgrass (Brachiaria ruziziensis) and tannergrass (Brachiaria arrecta) during the seasons (autumn, winter, spring and summer). The experiment was carried out from April 2022 to March 2023 at the Capim Branco Experimental Farm, at the University Feddade Federal de Uberlândia, in a completely randomized design, with three replications. The morphogenesis of forage plants was evaluated based on four characteristics: leaf appearance rate (LApR), leaf elongation rate (LAlR), leaf life span (LLS) and stem elongation rate (SAlR). In autumn and winter, there were lower LApR, LAlR and SAlR, while, in spring and summer, there were higher values of these characteristics. On the other hand, in autumn and winter, the LLS was prolonged, compared to other seasons. In autumn, B. arrecta had higher LApR and lower LLS than the other grasses. In this season, B. arrecta and B. humidicola had higher LAlR. SAlR in autumn was higher in B. ruziziensis. In winter, B. arrecta exhibited higher LApR, LAlR and SAlR, but lower LSS, compared to other brachiaria. In spring, the LApR of B. arrecta was higher compared to other grasses. In spring, the LAlR of B. ruziziensis and B. decumbens was higher than that of B. arrecta and B. humidicola. In spring, SAlR was higher in B. arrecta and LSS in B. humidicola was higher than in other brachiarias. In summer, B. arrecta had higher LApR, B. ruziziensis had higher LAlR than the other brachiarias. The grasses B. decumbens, B. humidicola, B. ruziziensis and B. arrecta have seasonal growth patterns. The grasses B. decumbens, B. humidicola, B. ruziziensis and B. arrecta respond differently to the specific environmental conditions of each season of the year.