Abstract:

With the prolonged continuous cultivation of Chrysanthemum morifolium (Chuju), a substantial accumulation of phenolic acid compounds has occurred in the soil. Phenolic acid-degrading bacteria can alleviate the obstacles of continuous cropping by degrading these compounds in the soil. In this study, 85 strains of phenolic acid-degrading bacteria were isolated from the continuous cropping soil of Chrysanthemum morifolium. By evaluating the degradation efficiency and growth-promoting effects of these strains, a rhizosphere-promoting bacterium with the ability to degrade phenolic acids in Chrysanthemum morifolium was selected. Identification results revealed that the strain belonged to the Burkholderia genus VA-7, exhibiting a degradation rate of over 45% for various phenolic acids. Additionally, the strain demonstrated capabilities for nitrogen fixation, phosphorus solubilization, potassium release, iron carrier production, and indole-3-acetic acid (IAA) synthesis. This study provides a new theoretical basis for alleviating the continuous cropping obstacles of Chrysanthemum morifolium.

Key words: continuous cropping obstacles, phenolic acid compounds, phenolic acid-degrading bacteria, rhizosphere-promoting bacteria