Bactérias promotoras de crescimento alteram o desenvolvimento da parte aérea e sistema radicular da canola

Abstract

Plant growth promoting rhizobacteria (PGPR) are soil bacteria that have the ability to colonize the rhizosphere and favor the growth of plants through several mechanisms, such as phytohormone production, biological fixation in nitrogen (BNF), increased efficiency in uptake of nutrients in the soil, and greater tolerance to water stress or disease attack. The objective of this work was to evaluate the effects of inoculation of different growth promoting bacteria on the development of canola plants. The experiment was conducted in a greenhouse with a completely randomized design. Four treatments were evaluated: control - without inoculation, Azospirillum brasilense of strain Ab-V5, Rhizobium sp. strain 8121, and Bacillus sp. strain CM. The height parameter of plants was evaluated weekly, starting at 25 days after sowing (DAS). At the end of the evaluations, at 53 DAS, the length of the main root, the dry mass of the aerial part and the root system were measured. The canola showed a linear increase in height from 25 to 53 DAS. Bacillus sp. negatively influenced the growth of the plants, reducing their height in periods 25, 32 and 39 DAS in relation to the control group. A. brazilense. yielded 2.64 times more dry root mass (0.7 g plant-1) than the control plants (0.3 g plant-1). Even though Rhizobium sp. produced an increase in the length of the main root, this was not reflected in an increment of dry mass in the root system. The greatest development of the root system was provided by A. brazilense.

Efecto de rizobacterias promotoras del crecimiento vegetal en parámetros agronómicos y de macronutrientes en pak choi

“…Un sistema radical más abundante beneficia al anclaje y soporte de la planta al suelo, una mayor superficie de contacto permite que la planta explore el suelo, Absorba agua y nutrientes, así como una mayor interacción con los microorganismos del suelo. Los resultados de las interacciones entre suelo-planta-microorganismo resultan complejas y van a diferir de factores como el tipo de suelo, su localización geográfica, la etapa fenológica y salud de la planta (Gomes et al, 2018).…”