Use of plant growth promoting rhizobacteria strains in tomato (Lycopersicon esculentum Mill.) in villaflores, chiapas, Mexico

摘要

The strains GB03 and IN937b of Bacillus subtilis and IN937a of B. amyloliquefaciens were evaluated at three rates (106, 107, and 108 CFU/ml‐1) in seed germination and growth promotion in tomato plants. The most probable number was used to determine the bacterial population. In the experiment conducted under laboratory conditions, the germination rate increased in seeds treated with IN937a at 108 CFU/ml and GB03 at 106 and 107CFU/ml. The root length was increased with GB03 at 108 CFU/ml and the caliper diameter with the same strain at 106 CFU/ml and the strain IN937b at 108 CFU/ml. Under greenhouse conditions, seed germination was increased with strains IN937a at 106 CFU/ml and GB03 at 106 and 108 CFU/ml. Shoot and root weight was enhanced with the strain GB03 at 107 CFU/ml while the total weight with the strain GB03 at 106 CFU/ml and IN937b at 106 CFU/ml. Stem length was increased with IN937a at 106 CFU/ml, GB03 at 107 CFU/ml and IN937b at 108 CFU/ml. In general strains IN937a and GB03 increased the caliper diameter. Growth promotion was achieved with the strains IN937a at 108 CFU/ml, GB03 at 106and 10 CFU/ml and IN937b in all three concentrations. The chlorophyll content was increased with IN937a at 107 and 108 CFU/ml.