Journal of Soil and Plant Interactions
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Agricultural Research Education And Extention Organization
Abstract: (35 Views)
Background and Objective: Corn is a crop with moderate sensitivity to soil salinity; therefore, improving its resistance to salinity stress is very important. Methods: To investigate the effect of native extremophile isolates of Khorasan Razavi (with the highest ability to produce tri-indoleacetic acid (IAA), soluble mineral phosphates (PSB), and exopolysaccharides (EPS)) on the yield, yield components, and micronutrient concentrations of supersweet corn (Elika cultivar), a study was conducted using three separate factorial experiments in a randomized complete block design. Each experiment included two factors: 1) type of bacteria (halophilic, alkaliphilic, and haloalkaliphilic) and 2) three different native isolates of each type, along with two controls (culture medium without bacteria and water) in nine replications under saline-alkali soil conditions in 2024. Results: The average isolate’s concentration of IAA, PSB, and EPS production were obtained for halophiles (74.55, 44.54 mg l-1 and 29.27 µM l-1), alkaliphiles (1390.50, 135.65 mg l-1 and 19.12 µM l-1), and haloalkaliphiles (256.97, 141.66 mg l-1 and 99.79 µM l-1), respectively. The average yield components and concentrations of micronutrients, except iron, were higher in the haloalkaliphilic group, and the average corn yield was higher in the halophilic group. Alkaliphilic bacteria showed superiority in the absorption of iron (145.4 mg/kg) and manganese (34.6 mg/kg). The efficiency of alkaliphiles was not as high as the other two groups, probably due to insufficient sodium concentration, but A14 had a higher yield (2.245 kg/m2) than the others. Conclusions: The maximum average corn yield was observed in the halophilic isolate H5 with 3.879 kg/m2, followed by the haloalkaliphilic isolate HA8 with 2.825 kg/m2. There was a difference of 2.7 kg/m2 between the maximum (H5) and minimum (A11) corn yield. The lower yield in the haloalkaliphilic isolates was probably due to the higher soil salinity (34.1 dS/m) compared to the halophilic isolates (12.5 dS/m).
Type of Study: Research |
Subject:
Plant growth promoting microrganisms in the rhizosphere
Received: 2025/06/30 | Accepted: 2025/11/2
Received: 2025/06/30 | Accepted: 2025/11/2
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Journal of Soil and Plant Interactions by http://jspi.iut.ac.ir is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License which allows users to read, copy, distribute and make derivative works for non-commercial purposes from the material, as long as the author of the original work is cited properly.
