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Microbe-Plant Interactions01:09

Microbe-Plant Interactions

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Microbe-plant interactions represent a dynamic spectrum of associations shaped by intricate chemical signaling. These interactions can be neutral, beneficial, or detrimental, and profoundly influence plant physiology, growth, and ecosystem function. The plant microbiome, comprising bacteria, fungi, archaea, protists, and viruses, plays a pivotal role in mediating these effects through surface colonization, internal colonization, or systemic symbiosis.Mutualistic associations, particularly with...
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Seed-derived defensins from Scots pine: structural and functional features.

Plantaยท2021
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Updated: May 6, 2026

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Isolation and Characterization of Multi-Trait Plant Growth-Promoting Endophytic Bacteria from Scots Pine Tissues.

Yuliia I Shalovylo1,2, Yurii M Yusypovych1, Oleh Y Kit1

  • 1Ukrainian National Forestry University, 103 Gen Chuprynky Str., Lviv 79057, Ukraine.

Journal of Microbiology and Biotechnology
|February 2, 2025
PubMed
Summary

This study found that specific Pseudomonas strains, P57 and P88, significantly boost Scots pine seedling growth and stress resistance. These plant growth-promoting bacteria enhance germination and biomass, offering a sustainable solution for forestry and afforestation efforts.

Keywords:
Endophytic bacteriaPinus sylvestris L.PseudomonasStenotrophomonasgrowth-promoting potentialseed inoculation

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Area of Science:

  • Forestry and Plant Pathology
  • Microbial Ecology and Biotechnology

Background:

  • Scots pine (Pinus sylvestris) is economically vital, but seedling viability and stress resistance are challenges in afforestation.
  • Plant growth-promoting (PGP) bacteria, particularly Pseudomonas, show promise for enhancing crop growth, yet their efficacy in trees is less understood.

Purpose of the Study:

  • To isolate and identify PGP Pseudomonas strains from Scots pine stems.
  • To evaluate the in vitro PGP activities and in vivo bioinoculant potential of these strains for Scots pine.

Main Methods:

  • Isolation and 16S rRNA gene sequencing of bacterial strains from Scots pine stems.
  • In vitro assays for antifungal activity, nitrogen fixation, IAA, ammonia, siderophore production, and phosphate solubilization.
  • Two-year field trial assessing seed germination, seedling biomass, and bacterial colonization post-inoculation.

Main Results:

  • Four bacterial isolates were identified, including Pseudomonas putida P57 and Pseudomonas lurida P88.
  • All isolates inhibited fungal pathogens and exhibited PGP traits like nitrogen fixation and IAA production.
  • Bioinoculation with P57 and P88 significantly increased seed germination (35-45%) and seedling aerial biomass (80-140%), with long-term root and stem colonization.

Conclusions:

  • Selected Pseudomonas strains possess significant plant growth-promoting and stress-alleviating properties.
  • These PGP bacteria demonstrate strong potential as effective bioinoculants for improving Scots pine seedling establishment and growth in field conditions.
  • The study supports the use of microbial solutions for sustainable forestry and enhancing tree resilience in challenging environments.