植物根际促生菌对桂花生长、生理适应性及土壤性状的影响OA

[Objective]This study investigated the effects of inoculating Osmanthus fragrans with two plant growth-promoting rhizobacteria(PGPR),Yokenella regensburgei and Pseudomonas mosselii,to provide a reference for future PGPR application in O.fragrans cultivation.[Method]PGPR strains isolated from O.fragrans rhizosphere soil were selected for a pot experiment.One-year-old O.fragrans seedlings were inoculated with Y.regensburgei,P.mosselii,or left untreated(control group)to assess the impacts of PGPR on plant growth,physiological adaptation,and rhizosphere soil properties.[Result]Both PGPR strains promoted plant height and increased root fresh weight,stem fresh weight,root length,and stem length.Y.regensburgei demonstrated a more significant effect on the growth characteristics of O.fragrans.Both PGPR treatment could significantly enhance the CAT of O.fragrans.PGPR application increased soil organic matter content but did not significantly alter soil pH,electrical conductivity,available phosphorus,or available potassium content.[Conclusion]The PGPR strains Y.regensburgei and P.mosselii improved the rhizosphere soil environment and enhanced the growth and physiological processes of O.fragrans,with Y.regensburgei exhibiting superior overall efficacy.These screened strains offer potential for developing specialized microbial fertilizers for O.fragrans,thereby advancing novel fertilizer research and promoting the growth of this plant species.