Evaluación de Bacillus spp. como rizobacterias promotoras del crecimiento vegetal (RPCV) en brócoli Brassica oleracea var. italica) y lechuga (Lactuca sativa)

Ramiro Daniel Acurio Vásconez, Johanna Estefania Mamarandi Mossot, Andrea Giomayra Ojeda Shagñay, Estefany Michelle Tenorio Moya, Viviana Pamela Chiluisa Utreras, Ivonne de los Ángeles Vaca Suquillo

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3 Citas (Scopus)


Lettuce and broccoli are valuable agricultural products in Ecuador whose cultivation demands considerable quantities of mineral nutrients, usually obtained from chemical fertilizers. As the use of plant growth-promoting rhizobacteria (PGPR) has shown to be a biological alternative for cropping these vegetable species, several strains of Bacillus spp. were evaluated through laboratory and field tests. Biological nitrogen fixation was performed by a qualitative assessment in a free nitrogen culture medium; the indoleacetic acid production was carried out in a Tryptic Soy Broth (TSB) medium by quantifying its concentration using Salkowski’s reagent; phosphate solubilization was established on an NBRIP medium and the transformed phosphorus concentration was quantified with the Mo-Blue reagent. The data obtained showed a significant difference between the treatments (p < 0.01) where B. megaterium and B. licheniformis showed a higher ability to fix nitrogen, produce auxins, and solubilize phosphate. Field tests achieved, on the one hand, an increase in height of 26.7 % and 13.7 % in lettuce and broccoli, respectively, with a weekly application of B. licheniformis. On the other hand, a weekly application of B. megaterium significantly increased the dry matter content, length, and root weight in lettuce as well as in broccoli. All comparisons were made against a control. These results show that the strains identified in this research could be considered as growth-promoting microorganisms and are a biological alternative to chemical fertilizers.

Título traducido de la contribuciónEvaluation of Bacillus spp. as plant growth-promoting rhizobacteria (PGPR) in broccoli (Brassica oleracea var. italica) and lettuce (Lactuca sativa)
Idioma originalEspañol
Número de artículoe1465
PublicaciónCiencia Tecnologia Agropecuaria
EstadoPublicada - jul. 2020

Nota bibliográfica

Publisher Copyright:
© 2020 Corporacion Colombiana de Investigacion Agropecuaria Corpoica. All rights reserved.

Copyright 2020 Elsevier B.V., All rights reserved.

Palabras clave

  • Auxins
  • Biofertilizer
  • Nitrogen fixation
  • Phosphate solubilizing
  • Rhizobacteria


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