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Orchid Root Associated Bacteria: Linchpins or Accessories?

Jaspreet Kaur1, Jyotsna Sharma1

  • 1Department of Plant and Soil Science, Texas Tech University, Lubbock, TX, United States.

Frontiers in Plant Science
|July 12, 2021
PubMed
Summary

Root-associated bacteria (RAB) play a crucial role in plant health, yet their interactions with orchids remain understudied. Further research into orchid RAB ecology is essential for understanding plant-microbial dynamics and conservation efforts.

Keywords:
mycorrhizal fungimycorrhization helper bacteriaorchidsplant growth promoting rhizobacteriarhizosphereroots

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Area of Science:

  • Plant-microbial ecology
  • Bacteriology
  • Mycology

Background:

  • Root-associated bacteria (RAB) interact with plants and fungi, influencing plant fitness and diversity.
  • Orchidaceae, an obligate mycorrhizal plant family, have poorly understood RAB associations.
  • Current research on RAB in orchids and their tripartite interactions is limited.

Purpose of the Study:

  • To highlight the current knowledge gaps in orchid RAB ecology.
  • To propose novel research questions and hypotheses for advancing plant-microbial ecology.
  • To emphasize the importance of RAB in orchid holobionts and co-evolution.

Main Methods:

  • Review of existing literature on RAB, mycorrhizal fungi, and plant holobionts.
  • Identification of key research areas in orchid RAB ecology.
  • Formulation of hypotheses regarding RAB functions (PGPR, MHB) and hologenomic perspectives.

Main Results:

  • The study identifies a significant lack of research on RAB associated with orchids.
  • It outlines potential beneficial roles of RAB for orchids, including plant growth promotion and mycorrhization.
  • The need for a hologenomic approach to study orchid holobiont co-evolution is emphasized.

Conclusions:

  • Understanding orchid RAB is critical for advancing plant-microbial ecology.
  • Future research should focus on the hologenomic interactions between orchids, OMF, and RAB.
  • This research has implications for orchid conservation and habitat management.