Evaluating effects of plant growth-promoting rhizobacteria on the radiation use efficiency and yield of soybean (Glycine max) under water deficit stress condition
2019
Mondani, Farzad | Khani, Kianoosh | Honarmand, Saeid Jalali | Saeidi, Mohsen
The application of soil microorganisms in the agroecosystems is one of possibility that improve crops yield via increase resources use efficiency and capture capacity. The aim of this study was to evaluate ecophysiological traits such as radiation absorption and use efficiency, and yield of soybean under the water deficit stress and plant growth-promoting rhizobacteria (PGPR) application conditions. Treatments evaluated in the study were contribution of different irrigation regimes including the water deficit stress from mid pod to maturity stages (I1), the water deficit stress from grain filling to maturity stages (I2) and optimum irrigation in all development stages (I3), and the PGPR application including uninoculated control (B1), Bacillus subtilis (B2) and Bacillus licheniformis (B3). The water deficit stress reduced all measured traits of soybean significantly. In all irrigation regimes, the highest and the lowest measured traits were observed in the B. licheniformis application and uninoculated control, respectively. The greatest effects of the PGPR inoculated observed for grain yield (22.9%) followed by protein content (18.8%) and radiation use efficiency (15.2%), respectively, in the I2 treatment than other irrigation regimes. The PGPR application increased significantly leaf area index (13.2%), total dry weight (13.0%), radiation use efficiency (15.2%), grain yield (13.1%) and oil (9.2%) and protein (9.6%) content in B3 compared to B1 treatments. The greatest effects of PGPR were observed in the I2 treatment compared to other treatments. The PGPR could promote soybean yield under the water deficit stress via increasing of photosynthesis and radiation use efficiency.
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