Objective:This paper focuses on isolating and identifing lactic acid bacteria Weisellas paramesenteroides,and investigating its promoting effects on the development and growth of Drosophila melanogaster.This study also explores its mechanism of growth promoting effects.Methods:Bacterium was isolated from the gut of D.melanogaster with MRS selective medium and identified by Gram staining and BLAST analysis of 16S rRNA gene.Germ free,conventional reared and gnotobiotic flies were prepared.The developmeantal d...