Identification and functional analysis of endophytic bacteria Bacillus cereus in Sphagnum palustre +original data

Endophytic bacteria in S. palustre have a growth-promoting effect on plants. In this study, the endophytic bacterium strain J11 in S. palustre was isolated and identified as Bacillus cereus, and its growth cycle, functional characteristics and effects on maize growth were analyzed. The results indicate that as B. cereus, the growth cycle of J11 consists four phases, andthe logarithmic phase lasts 2~24 hours, with the abilities of phosphorus solubilization, nitrogen fixation, IAA, protease, siderophore, and NH3 production. The phosphorus solubilization ability of J11 ranges from 1.66±0.07 to 1.98±0.07 mg/L, and the IAA production varies from 1.51±0.07 to 8.67±0.16 mg/L. It has a growth-promoting effect on maize by increasing seed germination rate by 29.27%, plant height by 4.21%, leaf length by 17.12%, leaf width by 29.51%, above-ground fresh weight by 50.79%, below-ground fresh weight by 46.30%, and chlorophyll content by 56.81%. This study is the first to isolate and identify Bacillus cereus from S. palustre and explore its various potential growth-promoting functions and characteristics, providing materials and theoretical foundations for developingB. cereus as a biofertilizer.