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Background and aims <p>The inoculation of <i>Bradyrhizobium</i> spp. in soybean is a widespread technology in Brazil and one of the most successful cases of plant-bacteria interaction once all the nitrogen required by the plant is provided through biological nitrogen fixation. Co-inoculation of <i>Bradyrhizobium spp</i>. with <i>Azospirillum brasilense</i> AbV5/AbV6 was recommended in Brazil in 2013, but its adoption by farmers has been limited due to variable yield gains. In the present work, we hypothesized that additional traits of <i>A. brasilense</i>, such as resistance to oxidative stress and ammonium excretion, further enhance its growth-promoting effects in soybean when co-inoculated.</p> Methods <p>Therefore, an oxidative resistant strain (IH1), two constitutive nitrogen fixing strains (HM053 and HM210) and the commercial strains (AbV5/AbV6) of <i>A. brasilense</i> were co-inoculated with <i>Bradyrhizobium</i> spp. in soybean. The experiments were carried out in four distinct soil and edaphoclimatic regions of Brazil to evaluate soybean nodulation, growth, and yield.</p> Results <p>The novel strains of <i>A. brasilense</i> enhanced soybean nodulation and grain yield. The co-inoculation with the HM053 strain resulted in the highest increase in soybean grain yield, ranging from 4.3% to 25.4%, or 151.7 to 878.1&#xa0;kg/ha, compared to single inoculation.</p> Conclusion <p>This promising technology generates environmental and economic gains, since it promotes plant growth, increases yield and contributes for a sustainable agriculture.</p>

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Enhancing soybean yield through co-inoculation of Bradyrhizobium spp. and ammonium-excreting Azospirillum brasilense HM053

  • 期刊论文

  • 发表日期：

    2025年2月28日

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  • S. C. Araujo,
  • R. M. Etto,
  • E. M. Souza,
  • F. O. Pedrosa,
  • F. Furmam-Cherobim,
  • A. R. Bini,
  • D. R. P. Gonçalves,
  • E. Guerlinguer,
  • P. C. Conceição,
  • A. L. Braccini,
  • D. C. V. Marteli,
  • E. L. Souchie,
  • I. M. B. Torneli,
  • C. W. Galvão

摘要

Background and aims

The inoculation of Bradyrhizobium spp. in soybean is a widespread technology in Brazil and one of the most successful cases of plant-bacteria interaction once all the nitrogen required by the plant is provided through biological nitrogen fixation. Co-inoculation of Bradyrhizobium spp. with Azospirillum brasilense AbV5/AbV6 was recommended in Brazil in 2013, but its adoption by farmers has been limited due to variable yield gains. In the present work, we hypothesized that additional traits of A. brasilense, such as resistance to oxidative stress and ammonium excretion, further enhance its growth-promoting effects in soybean when co-inoculated.

Methods

Therefore, an oxidative resistant strain (IH1), two constitutive nitrogen fixing strains (HM053 and HM210) and the commercial strains (AbV5/AbV6) of A. brasilense were co-inoculated with Bradyrhizobium spp. in soybean. The experiments were carried out in four distinct soil and edaphoclimatic regions of Brazil to evaluate soybean nodulation, growth, and yield.

Results

The novel strains of A. brasilense enhanced soybean nodulation and grain yield. The co-inoculation with the HM053 strain resulted in the highest increase in soybean grain yield, ranging from 4.3% to 25.4%, or 151.7 to 878.1 kg/ha, compared to single inoculation.

Conclusion

This promising technology generates environmental and economic gains, since it promotes plant growth, increases yield and contributes for a sustainable agriculture.