<i>Bacillus velezensis</i> BY6 Promotes Growth of Poplar and Improves Resistance Contributing to the Biocontrol of <i>Armillaria solidipes</i>

Abstract

To improve the application of endophyte Bacillus velezensis BY6 from the xylem of poplar, the effect of BY6 on the growth of diseased Populus davidiana × Populus. alba var. pyramidalis Louche (Pdpap poplar) seedlings and the biological control effect on the pathogen Armillaria solidipes were tested using a plant split-root experiment. After applying BY6 to the roots of diseased Pdpap poplar seedlings, the results show that plant growth indicators (dry mass, fresh mass, and plant height) were significantly increased (p p p < 0.05). Amazingly, the results indicate that BY6 simultaneously activates induced systemic resistance (ISR) and systemic acquired resistance (SAR) in diseased Pdpap poplar seedlings and promotes growth. The results indicate that BY6 is a promising candidate for developing forest tree biofertilizers and biopesticides.

Keywords

• biological control
• <i>Armillaria solidipes</i>
• growth promotion
• <i>Bacillus velezensis</i>
• ISR
• SAR