Resumo

CAZARES-ESQUIVEL, Sigrid Eugenia; CARBALLO-SANCHEZ, Marco Polo  e  ALMARAZ-SUAREZ, Juan José. Effect of plant growth-promoting rhizobacteria on agronomic and macronutrient parameters in pak choi. Rev. Mex. Cienc. Agríc [online]. 2023, vol.14, n.4, pp.633-639.  Epub 04-Ago-2023. ISSN 2007-0934.  https://doi.org/10.29312/remexca.v14i4.3118.

Pak choi is a vegetable of high nutritional value and palatability, which has promoted the increase of its cultivation and consumption outside Asia, its region of origin. This work evaluated the effect of the inoculation of three strains of plant growth-promoting rhizobacteria (PGPR) Arthrobacter pokkalii JLB4, Pseudomonas tolaasii P61 and Pseudomonas tolaasii A46 on pak choi plants under controlled conditions in a high tunnel in 2021. Pak choi seedlings without inoculation were used as a control and two inoculations were performed, the first immediately after transplantation of the seedlings into bags with 5 kg of soil and the second one month later. The plants were simultaneously fertilized with inoculation with NPK in a ratio 164-53-187. The results obtained showed that the strain Pseudomonas tolaasii P61 was the one that had the greatest effect on dry weight (23.04 ± 0.057 g plant-1), as well as on the content of P (0.1704 ± 0.001 g plant-1) and S (0.1847 ± 0.004 g plant-1) compared to the control, with increases of 11.5%, 10.8% and 12.3%, respectively. The strain Arthrobacter pokkalii JLB4 caused greater root growth, the root volume (75 ± 5 ml) was 49% higher than the control. However, it had no effect on the dry weight of the aerial part. The results suggest that the combined use of fertilizer and PGPR leads to greater accumulation of biomass and nutrients, such as P, K and S, than the application of fertilizer alone.

Palavras-chave : Brassica rapa subsp. chinensis; Pseudomonas tolaasii; Arthrobacter pokkalii.