Antagonistic Streptomyces-PR87 Application, Improves Significantly Growth, Yield, and Fruit QualitiesGreenhouse Tomatoes

摘要

Streptomyces-PR87 has potential to control plant pathogens and promote plant-growth. This research aims to, develop the application of Streptomyces-PR87 for tomato-growth enhancement and determine plant-growth promoting mechanisms. Results, the efficient protocol was weekly interval cell suspension spraying OD600 = 1 volume 200 mL / tray 4 times. Seedling was showed the increasing of plant height, number of true leaf, SPAD value, root area and biomass. Continuous spraying OD600 = 1, 20 mlVplant at after transplanting, 12 weeks was promoted plant high, SPAD value, number of inflorescence, fruit set inflorescence and also increased yield up to 50-60 percent, flesh thickness 16-20 percent, fruit firmness 24-66 percent and percentage of Brix. Response of 6 tomatoes varieties on spraying application was showed well growth and non-appeared negative effected. Streptomyces- PR87 has mechanisms involved plant-growth promotion including biosynthesized indole-3-acetic acid via tryptophan dependent pathway with the highest level was 3.07 /ig/ mL, the highest phosphate solubility index was 2.0 and presented of siderophore activity.