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Background and aims <p>Inoculation with plant beneficial microorganism (BM) may enhance plants’ resilience, their growth and decrease the susceptibility to pathogens and diseases. Good example of a beneficial microorganism is <i>Ensifer meliloti</i> (<i>Sinorhizobium meliloti</i>) Rm2011, a <i>N</i>-acyl homoserine lactones producing bacterium known for its beneficial effects on different plants in greenhouse or in vitro settings. Aim of this study was to transfer these findings to field conditions, a crucial step in development of applications for sustainable agriculture.</p> Methods <p>In this report, we present results from a four-year-long field experiment, in which genetically diverse spring barley (<i>Hordeum vulgare</i>) lines were inoculated with <i>E.</i>&#xa0;<i>meliloti</i>. The susceptibility of barley to naturally occurring leaf pathogens and diseases (e. g. leaf rust, mildew, chlorosis and necrosis) was monitored throughout the vegetative season. In addition, during the growth season, environmental parameters like air and soil temperatures, humidity and rainfall were recorded.</p> Results <p>We demonstrate that barley responsiveness to inoculation with BM, referred to here as <i>primability</i>, depends on its genetic background. Both <i>primable</i> and <i>non-primable</i> barley lines were identified. Our results indicate moreover that upon field conditions, air temperature and air humidity, modulate the potential responsiveness of barley to <i>E.</i>&#xa0;<i>meliloti</i> in <i>primable</i> lines.</p> Conclusion <p>This study shows that a plant protective application based on inoculation with <i>E. meliloti</i> should consider multifactorial interactions among the plant genotype, the pathogen and the beneficial microorganism. Furthermore, the environment can have an influence on the effectiveness of the inoculation.</p>

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Effectiveness of Ensifer meliloti as beneficial microorganism depends on barley’s genotype and specific environmental factors

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月9日

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  • Matthias Cambeis,
  • Nina Bziuk,
  • Benjamin Straube,
  • Karolin Pohl,
  • Desirée Lauterbach,
  • Johannes Krumwiede,
  • Kornelia Smalla,
  • Adam Schikora

摘要

Background and aims

Inoculation with plant beneficial microorganism (BM) may enhance plants’ resilience, their growth and decrease the susceptibility to pathogens and diseases. Good example of a beneficial microorganism is Ensifer meliloti (Sinorhizobium meliloti) Rm2011, a N-acyl homoserine lactones producing bacterium known for its beneficial effects on different plants in greenhouse or in vitro settings. Aim of this study was to transfer these findings to field conditions, a crucial step in development of applications for sustainable agriculture.

Methods

In this report, we present results from a four-year-long field experiment, in which genetically diverse spring barley (Hordeum vulgare) lines were inoculated with E. meliloti. The susceptibility of barley to naturally occurring leaf pathogens and diseases (e. g. leaf rust, mildew, chlorosis and necrosis) was monitored throughout the vegetative season. In addition, during the growth season, environmental parameters like air and soil temperatures, humidity and rainfall were recorded.

Results

We demonstrate that barley responsiveness to inoculation with BM, referred to here as primability, depends on its genetic background. Both primable and non-primable barley lines were identified. Our results indicate moreover that upon field conditions, air temperature and air humidity, modulate the potential responsiveness of barley to E. meliloti in primable lines.

Conclusion

This study shows that a plant protective application based on inoculation with E. meliloti should consider multifactorial interactions among the plant genotype, the pathogen and the beneficial microorganism. Furthermore, the environment can have an influence on the effectiveness of the inoculation.