Competitiveness of Bradyrhizobium japonicum inoculation strain for soybean nodule occupancy

Dragana Miljakovic; Jelena Marinković; Maja Ignjatov; Dragana Milosević; Zorica Nikolić; Branislava Tintor; Vojin Đukić

doi:10.17221/430/2021-PSE

Competitiveness of Bradyrhizobium japonicum inoculation strain for soybean nodule occupancy

Dragana Miljakovic , Jelena Marinković, Maja Ignjatov, Dragana Milosević, Zorica Nikolić, Branislava Tintor, Vojin Đukić

https://doi.org/10.17221/430/2021-PSECitation:

Miljaković D., Marinković J., Ignjatov M., Milošević D., Nikolić Z., Tintor B., Đukić V. (2022): Competitivenessof Bradyrhizobium japonicum inoculation strain for soybean nodule occupancy. Plant Soil Environ., 68: 59–64.

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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

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Czech Academy of Agricultural Sciences

Competitiveness of Bradyrhizobium japonicum inoculation strain for soybean nodule occupancy

Dragana Miljakovic , Jelena Marinković, Maja Ignjatov, Dragana Milosević, Zorica Nikolić, Branislava Tintor, Vojin Đukić

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