Seleção de rizobactérias promotoras de crescimento para a cultura da soja

Abstract

The rhizosphere facilitates root colonization by plant growth promoting rhizobacteria (PGPR), which may offer important benefits for the host. They are bacteria of free life in the soil that can associate with some plants, unleashing several benefits for the plant growth. With this work, we aimed to select rhizobacteria that promote the growth of soybean plants. The experiment was carried out at the Federal University of Pampa - Itaqui Campus. The rhizobacteria were pricked out in Petri dishes containing MB1 media, and incubated in BOD at 28° C for 24h. For the microbiolization of the seeds, a bacterial suspension from rhizobacteria was prepared in saline solution (0.85% NaCl), in the concentration of OD540 = 0.5 and adjusted in the spectrophotometer. Soybean seeds were microbiolized with ten rhizobacterial isolates already pre-selected in previous studies. Soon, the seeds were sown in pots containing commercial substratum Mecplant® . Finally, we conducted the greenhouse where emergency speed, plant size, leaf numbers and dry matter of shoot and root were evaluated. However, none of the ten isolates tested promoted the growth of soybean plants.