The growing of Solanum lycopersicum L. "tomato" is affected by salinity, reducing its water consumption, and affecting negatively plant growth and development. Therefore, it is necessary to seek sustainable cultivation and fertilization options, such as the use of plant growth-promoting rhizobacteria. This research aimed to determine the potential of rhizospheric Actinobacteria isolated from Opuntia sp. "prickly pear" as tomato growth promoting under salinity. The genera of isolated Actinobacteria were identified, the synthesis of 1-aminocyclopropane-1-carboxylic acid deaminase (ACC) was characterized and its effect on the germination of tomato cultivar Río Grande seeds was evaluated. Two tests on non-saline and saline soils were carried out to compare the effect of Streptomyces spp. and Nocardia sp. in plant development in the greenhouse. Several Actinobacteria genera were isolated fro...

El cultivo de Solanum lycopersicum L. “tomate” es afectado por la salinidad. Objetivo general determinar el potencial de Actinobacterias rizosféricas de Opuntia quitensis F.A.C. Weber “tuna” como promotoras de crecimiento en tomate bajo estrés salino. Metodología: Las Actinobacterias se aislaron de la rizósfera, se identificó el género y se investigó la actividad de la enzima ácido 1-aminociclopropano-1-carboxílico desaminasa (ACC) y el efecto en la germinación de semillas de tomate cv. Rio Grande bajo salinidad (Conductividad eléctrica, CEe=6,94 dSm-1). En condiciones de invernadero se realizaron dos ensayos en suelos no salino (CEe=1,40 dSm-1) y salino (CEe= 10,28 dSm-1 ) para comparar el efecto de Streptomyces sp. 10, Streptomyces sp. 21, y Nocardia sp. 13 en el desarrollo de las plantas. Resultados: En el 87,03 % de muestras de rizósfera se aislaron e identificaro...

Crops of Vigna unguiculata L. “cowpea” and Zea mays L. “corn” require chemical fertilizers for proper growth and development; however, its inadequate application contaminates the environment, creating the need to search new alternatives that reduce its impact. Due to this, the objective of this research was to determine the effect of a biofertilizer from fish wastes on the yield of cowpea and corn, and its effect on their rhizospheric microbiota. The physicochemical and biological characteristics of the biofertilizer were determined, and then was applied on the field under a completely randomized block design with six treatments: absolute control, chemical control, biofertilizer at 1%, 1.25%, 1.5% and 1.25% plus chemical fertilizer. The application of biofertilizer at 1, 1.25 and 1.5% increased the height, root length and yield of cowpea; however, the increase percentages were lo...