BACTÉRIAS PROMOTORAS DO CRESCIMENTO RADICULAR EM PLÂNTULAS DE DOIS CULTIVARES DE ARROZ IRRIGADO POR INUNDAÇÃO

Abstract

For growing and development the plants, in nature, count with the benefits of microorganisms residing in their rhizosphere. Plant growth promoting rhizobacteria (PGPR) are some of these microorganisms that interact in a beneficial way with plant species. Therefore, seed inoculation with PGPR can be an important and sustainable alternative to improve initial development and crop production. The aim of this study was to determine the effect of seeds microbiolization with PGPR on the root length of lowland rice seedlings. Under controlled conditions, two experiments were conducted with lowland rice cultivars (BRS Catiana and A 702 CL) in completely randomized design, with seven treatments and 10 replications. The treatments consisted of six microorganisms: BRM32109 (Bacillus sp.), BRM32110 (Bacillus sp.), BRM32111 (Pseudomonas sp.), BRM32112 (Pseudomonas fluorescens), BRM32113 (Burkholderia pyrrocinia), BRM32114 (Serratia sp.) and a control (without microorganism). The data were submitted to analysis of variance, the means among the treatments with PGPR were compared by LSD test (p<0.05) and, the treatments with microorganisms were individually compared to the control by Dunnett test (p<0.05). Only the cultivar BRS Catiana showed difference among the treatments. The highest root length was presented by the seeds treated with the isolates BRM32110, BRM32112, BRM32109, and BRM32114. Both of cultivars had significance when compared microorganisms to the control. Highlight for seeds of cultivar BRS Catiana, that when treated with the isolates BRM32110 and BRM32112 presented an average increase of 25.7% on the root length, compared to control treatment. For the cultivar A 702 CL, all the microorganisms provided increments with average value of 31% in the root length of rice seedlings. Based on the results it can be inferred that PGPR provide significant increases in seedling root length of lowland rice cultivars.