Effect of co-inoculation with Bradyrhizobium japonicum and Pseudomonas putida on root morph-architecture traits, nodulation and growth of soybean in response to phosphorus supply under hydroponic conditions

Shahjahon A. Begmatov, Yuriy I. Enakiev, Kakhramon D. Davranov, Dilfuza P. Jabborova

Abstract: Plant growth promoting Rhizobacteria with plant root inoculation plays important role in plant growth and yield. In our research, the root morph-architecture traits, nodulation and growth on soybean by Bradyrhizobium japonicum USDA 110 and Pseudomonas putida TSAU 1 strains effects were studied in high (250 µmol) and low (50 µmol) phosphorus nutrient solutions under hydroponic conditions. Soybean plants were grown for 45 days at 29°C day temperature and 20°C night temperature in phosphorus supply hydroponic conditions. Results revealed that the combination of B. japonicum and P. putida inoculation soybean significantly raised root morph-architecture traits, nodulation, and growth on soybean compared to control and single inoculation with B. japonicum USDA 110 alone under both nutrient solutions. There was a significant and positive correlation between root architecture and nodule number of soybean coinoculated with B. japonicum USDA 110 and P. putida TSAU 1 under high phosphorus (250 µM) nutrient condition. Our results indicate that the higher efficiency of the combination with B. japonicum USDA 110 and P. putida TSAU 1 symbiotic system is related to the ability to increase root morph-architecture traits, nodulation, and growth under low and high phosphorus nutrient solutions.

Keywords: nodulation; phosphorus; Rhizobacteria; root morph-architecture; soybean growth

Date published: 2019-01-04