Tomato is a vegetable crop with probiotic interest. Currently subject to a global biosecurity emergency due to the epidemic caused by COVID-19, humanity is seeking to maintain its health and become stronger by eating vegetables that have probiotic properties. Considering the request of tomato farmers in the Comarca Lagunera (CL) region, the objective of this work consisted of determining the impact of bioinoculation with Azospirillum brasilense (Ab) and solarized manure (M) on the yield and phytochemical quality of tomato fruits produced in shade mesh. Seeds of the saladette variety TOP 2299 were inoculated with Ab at 1 × 108 CFU.mL. Before 46 days after being sowed, seedlings were transplanted in soil enriched with manure solarized at a rate of 0, 40, 80, 120 and 160 t ha−1; a chemical fertilization (CHF) treatment was also adopted (366-95-635). Emergence, growth, root length, bromatological studies (protein and lipids in plant), yield and organoleptic (Vit C, phenols, flavonoids and lycopene) variables were considered. The results show that biofertilization based on Ab + M40 can be an alternative to produce tomato in shade-house conditions in the CL compared with non-inoculated and CHF treatments.

La investigación consistió en la aplicación foliar de nanopartículas de óxido de zinc (NPs ZnO), dos fuentes comerciales (Z40 y GZ), además de un tratamiento testigo y su efecto en el rendimiento y calidad comercial y nutracéutica en frutos de melón (Cucumis melo L.) cv Cruiser. Los tratamientos consistieron en la aplicación foliar de cinco dosis de NPs ZnO: 50, 100, 150, 200 y 250 mg L-1. Los resultados indicaron que el mayor rendimiento fue para el tratamiento con 200 mg L-1 de NPs ZnO con un incremento de 53 t ha-1, con relación al testigo, misma tendencia fue para el peso del fruto que mostró valores de 1.74 kg, 1.45 kg y 1.33 kg, respectivamente. En relación con el contenido de flavonoides, las dosis de 50 y 100 mg L-1 superaron al tratamiento testigo y a las fuentes comerciales; sin embargo, a medida que aumentaba la concentración de NP, disminuían los flavonoides. Los fenoles, la capacidad antioxidante (DPPH) y la vitamina C disminuyeron en 17, 10.8 y 9% con el control respectivamente. La mayor concentración de zinc en pulpa fue observada con e 200 mg L-1 NPs ZnO. El uso de nanopartículas de zinc es una buena alternativa para mejorar el rendimiento y contenido nutracéutico y la concentración de Zn en frutos de melón, siendo una opción para combatir la desnutrición de este micronutrimento.

In the communities of Sierra Mojada and Viesca, Coahuila, Mexico of Coahuila desert, two rhizosphere samplings of candelilla (Euphorbia antisyphilitica Zucc) were collected to isolate, characterize, and identifying plant growth-promoting rhizobacteria (PGPR); 165 rhizobacteria were tested in vitro with Arabidopsis thaliana seedlings to evaluate their potential as plant growth promoters, and obtaining 21 strains with best results in the variables of the number of secondary roots and fresh weight concerning the uninoculated control. Their salinity tolerance was evaluated at concentrations from 0.85 M, 1.7 M and 2.55 M of NaCl. Biochemical tests were accomplishing such as siderophores production, phosphates solubilization, production of Indole-3-acetic acid (IAA), and the activity of the ACC deaminase enzyme. The results obtained from 21 strains selected, high activities were obtained in organic substances like a siderophores since they developed a translucent orange halo around their growth; four rhizobacteria developed a clear halo around the bacterial growth with a thickness between 1.487 mm ± 0.667 mm and 5.267 mm ± 0.704 mm in phosphates solubilization; in the production of Indole-3-acetic acid (IAA), the bacterial strains showed the presence of this phytohormone, with values ​​from 4.444 μg mL-1 to 19.286 μg mL-1; and according to the activity of the ACC deaminase enzyme, values ​​from 0.424 to 1.306 µmol α-KB/h/mg Pr were showed. 16S rRNA sequencing was carried out and genus identified were Bacillus, Staphylococcus, Acinetobacter, Cronobacter and Siccibacter. The results obtained show the potential of the isolated rhizobacteria as growth promoters and the increase in the biomass of the Arabidopsis thaliana seedlings is evident. This is a first indication to proceed to carry out tests in different phenological stages in crops of agricultural importance.