Co-inoculação de sementes com produtos microbiológicos e variáveis morfofisiológicas em plantas de feijão

Abstract

Inoculation with beneficial microorganisms stands out as a promising biotechnological tool to increase common bean productivity. Within this context, this study aimed to evaluate the effect of treatments with Rhizobium tropici and Bacillus spp. consortia, applied alone and in combination, on the initial morphophysiological development of bean plants from seeds with different vigor levels (with and without accelerated aging). The experiment was conducted in a greenhouse, following a completely randomized design in a 7 x 2 factorial scheme, with four replications. Sequential evaluations of plant height were carried out, followed by the quantification of relative chlorophyll levels (SPAD) and leaf gas exchange parameters (IRGA) at 32 days after sowing. The results demonstrated that, although the T4 microbial consortium (B. amyloliquefaciens, B. velezensis, B. thuringiensis) promoted occasional superior improvements in growth variables and photosynthetic efficiency, such responses were of agronomically modest magnitude and inconsistent when compared to the control. The efficacy of inoculation with Rhizobium tropici was severely compromised by the physiological stress imposed by the accelerated aging of the seeds. The increments provided by the tested inoculants were not robust enough to economically justify their adoption, indicating the need to investigate more efficient and compatible microbial strains or to conduct trials under field conditions