Plant growth promoting bacteria and mycorrhizal on varieties of Sorghum spp. germination under stressing abiotic conditions

Background. Mexico currently ranks first in Sorghum production. Notwithstanding, soils in a productive area of Sonora are too poor in organic matter with saline intrusion and high temperatures. Farmers apply synthetic fertilizers but the indiscriminate use increase salinity. Under dry and arid zones, plant growth promoting bacteria (PGPB) and arbuscular mycorrhizal fungi (AMF) signifies a substitute to obtain nutrients. Objective. New and productive varieties of Sorghum in Sonora desert (Silo Miel 370 VCB (370), Sorgo Silo Miel 315 VC (315), Sorgo Silo Miel II (II) and Camino 526 Croplan winfield (526)) were evaluated inoculated with a species PGPB and AMF. Methodology. Under salinity, temperature regime (night/ day) in germination stage, tests were carried out considering the inoculation with PGPB and AMF; growth variables were measured like a percentage and rate, plant height, root length, and produced biomass (fresh and dry matter). Results. The cultivar 526 was the most outstanding with the PGPB and AMF evaluated; at the seedling stage, there were significant differences between the treatments for plant height, root length, fresh and dry weight, considering NaCl levels and temperature regimes. Implication. Studies of the association of PGPB and AMF with the Sorghum cv. 526 are recommended under field conditions. Conclusion. This study is the first step to obtain an ideal variety of Sorghum, which is a principal crop in dry arid and desert zones of México. This kind of study promotes beneficial microorganisms as a resource to increase the development and productivity of plants.