Competitiveness of Bradyrhizobium japonicum inoculation strain for soybean nodule occupancy

Dragana Miljaković, Jelena Marinković, Maja Ignjatov, Dragana Milošević, Zorica Nikolić, Branislava Tintor and Vojin Đukić
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Jelena Marinković: Institute of Field and Vegetable Crops, Novi Sad, Serbia
Maja Ignjatov: Institute of Field and Vegetable Crops, Novi Sad, Serbia
Dragana Milošević: Institute of Field and Vegetable Crops, Novi Sad, Serbia
Zorica Nikolić: Institute of Field and Vegetable Crops, Novi Sad, Serbia
Branislava Tintor: Institute of Field and Vegetable Crops, Novi Sad, Serbia
Vojin Đukić: Institute of Field and Vegetable Crops, Novi Sad, Serbia

Plant, Soil and Environment, 2022, vol. 68, issue 1, 59-64

Abstract: The competitiveness of Bradyrhizobium japonicum inoculation strain against indigenous rhizobia was examined in a soil pot experiment. The effect of inoculation strain was evaluated under different soil conditions: with or without previously grown soybean and applied commercial inoculant. Molecular identification of inoculation strain and investigated rhizobial isolates, obtained from nodules representing inoculated treatments, was performed based on 16S rDNA and enterobacterial repetitive intergenic consensus (ERIC) sequencing. Inoculation strain showed a significant effect on the investigated parameters in both soils. Higher nodule occupancy (45% vs. 18%), nodule number (111% vs. 5%), nodule dry weight (49% vs. 9%), shoot length (15% vs. 7%), root length (31% vs. 13%), shoot dry weight (34% vs. 11%), shoot nitrogen content (27% vs. 2%), and nodule nitrogen content (9% vs. 5%) was detected in soil without previously grown soybean and applied commercial inoculant. Soil had a significant effect on the shoot, root and nodule nitrogen content, while interaction of experimental factors significantly altered dry weight and nitrogen content of shoots, roots and nodules, as well as number of nodules. Nodulation parameters were significantly related with shoot dry weight, shoot and nodule nitrogen content. Symbiotic performance of inoculation strains in the field could be improved through co-selection for their competitiveness and effectiveness.

Keywords: competitiveness for nodulation; Glycine max; nitrogen fixation; protein crop; symbiotic bacteria (search for similar items in EconPapers)
Date: 2022
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:68:y:2022:i:1:id:430-2021-pse

DOI: 10.17221/430/2021-PSE

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