| Congresso Brasileiro de Microbiologia 2023 | Resumo: 1019-1 | ||||
Resumo:The genus Bacillus includes rod shape bacteria with high spore production and genotypic and phenotypic diversity. Some species are found in the soil and are capable of interacting with the plant’s roots promoting its growth. These bacteria are called plant growth-promoting rhizobacteria (PGPRs). In that regard, there are already products based on these bacteria, standing out because of their sporulation capacity, which improves product shelf-life. The objective of this work was to evaluate tomato cv. Micro-Tom (Solanum lycopersicum L. cv. Micro-Tom) root growth speed and size to select promising RPCPs strains. A group of 13 strains of Bacillus was inoculated (108 UFC/mL) in 5 seeds for each treatment for 30 minutes and germinated in Petri dishes with soaked filter paper for three days. After three days of germination, the seeds were sowed in Petri dishes with agar and maintained in the B.O.D at 28°C, following the radicular growth for the next 4 days. The samples were imaged by scanner every 24 hours and measured with ImageJ software. The roots treated with the strain RZ3MS27 showed a larger size on the third day compared to the others, except for RZ5MS10, indicating its potential as a growth promoter, especially in the early stages of plant development. This resulted in the largest average root size in absolute terms by the sixth day. Most of the treatments had their greatest effect on daily root growth on the 4th and 5th days of development, while the control containing only culture medium (MC) on the 3rd and 4th days exhibited the smallest root size, indicating its negative effect on this parameter compared to the other treatments. Thus, the inoculation of the RZ3MS27 strain has a significant effect in the early days of growth, influencing the initial rooting and promoting greater vigor and faster germination during this period of the crop in the field. Palavras-chave: Bacillus, plant growth promoting rhizobacteria, root, strain, tomato Agência de fomento:PET-MEC e FEALQ | |||||