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Bacterial endophytes: Molecular interactions with their hosts.

Surjit S Dudeja1, Pooja Suneja-Madan2, Minakshi Paul1

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Endophytic bacteria enhance plant growth by improving nutrient availability and controlling pathogens. Advanced molecular techniques are revealing the complex genetic interactions involved in these beneficial plant-microbe relationships.

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Area of Science:

  • Microbiology
  • Plant Science
  • Genomics

Background:

  • Plant growth promotion is linked to microbes in epiphytic, endophytic, or rhizospheric associations.
  • Endophytic bacteria are key players, offering benefits like enhanced nutrient availability, plant hormone production, and pathogen control.

Purpose of the Study:

  • To review recent advancements in understanding molecular communication between plants and endophytic bacteria.
  • To highlight the role of modern multidisciplinary approaches in unraveling these interactions.

Main Methods:

  • Metagenomics, metaproteomics, metatranscriptomics, metaproteogenomics, microRNA analysis, microarrays, and whole-genome sequencing.
  • Comparative genomics to identify gene expression changes in host plants and bacterial endophytes.

Main Results:

  • Over 400 genes in both host plants and endophytic bacteria show altered expression for endophytism and growth promotion.
  • Specific gene involvement identified: >20 for endophytism, ~50 for direct growth promotion, ~25 for biocontrol, ~10 for stress mitigation.

Conclusions:

  • Modern omics techniques are crucial for dissecting plant-endophyte molecular dialogues.
  • Significant genetic underpinnings exist for endophytic bacteria's beneficial roles in plant health and growth.