Plant Growth-Promoting Rhizobacteria Enhance Sweet Cherry Root System Development Through the Production of Volatile...

Area of Science:

• Agricultural Science
• Microbiology
• Plant Science

Background:

• Sweet cherry (Prunus avium L.) growth is limited by poor root systems and orchard conditions.
• Plant growth-promoting rhizobacteria (PGPR) can improve plant development and soil health via volatile organic compounds (VOCs).

Purpose of the Study:

• To evaluate the impact of VOCs from three PGPR strains on sweet cherry root development.
• To analyze the effects of PGPR VOCs on rhizosphere microbial communities.
• To establish a strain-concentration-effect relationship for optimizing PGPR application.

Main Methods:

• Exposure of sweet cherry seedlings to VOCs from Pantoea ananatis D1-28, Burkholderia sp. D4-24, and Burkholderia territorii D4-36 at specific concentrations.
• Measurement of cherry seedling growth parameters (plant height, biomass, root characteristics).
• Analysis of rhizosphere microbial community composition.

Main Results:

• Optimal growth promotion observed at 10^3 cfu·mL^-1 for D1-28 and D4-24, and 10^5 CFU·mL^-1 for D4-36.
• Significant increases in plant height, total biomass, root length, surface area, and volume compared to controls.
• VOCs modulated auxin synthesis in cherry roots and increased beneficial rhizosphere microorganisms.

Conclusions:

• PGPR VOCs effectively promote sweet cherry growth and root development.
• The study identified optimal concentrations for specific PGPR strains.
• Findings provide a basis for using PGPR to improve soil microbial environments and enhance cherry cultivation.