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<p>Plant growth-promoting bacteria (PGPB) inoculation is a promising management to improve sugarcane yield. However, different PGPB-traits from sugarcane fields in northeastern (NE) Brazil associated with plant nutrition (molybdenum – Mo, and nitrogen – N) need to be explored due to their potential to N budgets impact plant growth. The objective of this study was to evaluate the nitrogen nutrition and the performance of sugarcane in response to inoculation with PGPB and Mo and N fertilization. Two inoculation treatments and the control were used, (1) <i>Pantoea</i> sp. (UAGC 865); and (2) <i>Stenotrophomonas</i> sp. (UACG 869), and then plants were subjected to the interaction between N (0 and 2.90&#xa0;g pot<sup>−1</sup>) and Mo (0 and 0.90&#xa0;g pot<sup>−1</sup>) fertilizations. The biomass production, N contents, nitrate reductase and δ<sup>15</sup>N were measured in cane plant (RB867515 variety) in a greenhouse. The results suggest that Mo/N availability and bacteria strains affect N<sub>2</sub> fixation and alter the plant growth-promoting effects. Contribution of atmospheric N<sub>2</sub> to sugarcane was only significant in non-N-fertilized plants (53%). N fixation responded to the inoculation of strains and Mo availability with a tendency to increase N in BNF; however, N levels did not increase nor did they surpass the biomass yield of N-fertilized plants. Inoculation of strains, mainly <i>Stenotrophomonas</i> sp., and crop nutrition promoted the greatest increase in biomass production (53.8%), with BNF contributions of only 1.63%. Thus, the growth-promoting processes induced by inoculation and N and Mo fertilization can be promising strategies to increase crop yield potential in NE Brazil.</p>

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Plant Growth-Promoting Rhizobacteria and Plant Nutrition (Molybdenum and Nitrogen) can Enhance Sugarcane Performance

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Magda Aline da Silva,
  • Emídio Cantídio Almeida de Oliveira,
  • Jane Kelly Silva Araujo,
  • Joel José de Andrade,
  • Amanda Michele Santos de Lima,
  • Fernando José Freire

摘要

Plant growth-promoting bacteria (PGPB) inoculation is a promising management to improve sugarcane yield. However, different PGPB-traits from sugarcane fields in northeastern (NE) Brazil associated with plant nutrition (molybdenum – Mo, and nitrogen – N) need to be explored due to their potential to N budgets impact plant growth. The objective of this study was to evaluate the nitrogen nutrition and the performance of sugarcane in response to inoculation with PGPB and Mo and N fertilization. Two inoculation treatments and the control were used, (1) Pantoea sp. (UAGC 865); and (2) Stenotrophomonas sp. (UACG 869), and then plants were subjected to the interaction between N (0 and 2.90 g pot−1) and Mo (0 and 0.90 g pot−1) fertilizations. The biomass production, N contents, nitrate reductase and δ15N were measured in cane plant (RB867515 variety) in a greenhouse. The results suggest that Mo/N availability and bacteria strains affect N2 fixation and alter the plant growth-promoting effects. Contribution of atmospheric N2 to sugarcane was only significant in non-N-fertilized plants (53%). N fixation responded to the inoculation of strains and Mo availability with a tendency to increase N in BNF; however, N levels did not increase nor did they surpass the biomass yield of N-fertilized plants. Inoculation of strains, mainly Stenotrophomonas sp., and crop nutrition promoted the greatest increase in biomass production (53.8%), with BNF contributions of only 1.63%. Thus, the growth-promoting processes induced by inoculation and N and Mo fertilization can be promising strategies to increase crop yield potential in NE Brazil.