Transmission of Bacterial Endophytes

Area of Science:

• Plant microbiology
• Bacterial ecology

Background:

• Plants harbor complex endophytic bacterial communities within their tissues.
• Endophytes can be acquired horizontally from the environment or vertically through seeds.

Purpose of the Study:

• To review bacterial endophyte transmission routes.
• To identify knowledge gaps in plant endophytic colonization.

Main Methods:

• Literature review of plant-endophyte interactions.
• Drawing parallels from bacterial plant pathogen transmission studies.

Main Results:

• Key transmission routes include soil (roots), atmosphere, insects, seeds, and pollen.
• Root colonization from soil is well-studied, but aerial and stomatal colonization require more research.
• Conclusive evidence for vertical bacterial endophyte transfer is limited.

Conclusions:

• Plants likely benefit from acquiring new endophytic microbiomes each generation.
• Obligate vertical transmission of bacterial endophytes appears uncommon in plants.