Abstract
Bacillus cereus is a group of bacteria frequently found in soil, widely distributed in the environment. They are a group of ubiquitously facultative anaerobic spore-forming Gram-positive rods and are of health and economic benefits. The present study was conducted to identify, characterize about 36 cereus and examined for their potential plant growth promoting (PGP), which was tested in vitro. Parameters assessed were indole acetic acid (IAA) production, phosphate solubilization, starch hydrolysis, proteolytic activity and biofilm formation. Multiple cereus were isolated from several soil plots from South-Western region of Algeria and characterized by using phenotypic methods including fatty acid methyl ester. Ten bacterial isolates were examined in this study. Fatty acid profiles showed that bacterial isolates were classified into cereus group, three isolates were cereus Subgroup A and seven isolates were cereus Subgroup B. Temperature effect on the maximal specific growth rate was studied in cereus between 10 and 50°C, no growth was observed in 10°C, all cereus isolates grown from 15 to 45°C and no grown observed in 20 to 50°C. This study demonstrates adaptation of isolates of the cereus group to different habitats. The ability to solubilize precipitated phosphate was positively exhibited by three isolates, five isolates showed ability to produce IAA. All the isolated bacterial isolates had amylolytic and proteolytic activity. All isolates did not form a biofilm in the microtiter plate assays, while all cereus in our study formed biofilm in tubes at air-liquid interfaces. Key words: Bacillus cereus, soil, identification, plant growth promoting rhizobacteria (PGPR), phosphate solubization, biofilm
Highlights
In soil, microbes are especially active in the rhizosphere, which can contain more than a million microorganisms per gram of soil
Bacillus cereus is a group of bacteria frequently found in soil, widely distributed in the environment
Multiple B. cereus were isolated from several soil plots from South-Western region of Algeria and characterized by using phenotypic methods including fatty acid methyl ester
Summary
Microbes are especially active in the rhizosphere, which can contain more than a million microorganisms per gram of soil. Microbial community structures are variable and depend on factors such as temperature, pH, or geographic location, but are able to tolerate environmental change Microorganisms found in this environment use energy substrates released by roots such as and necessary to their metabolism: sugars, amino acids, organic acids, hormones. Some of these microorganisms, mainly bacteria, are able to effectively colonize the root systems and stimulating plant growth and / or protecting against infections by plant pathogens. Mainly bacteria, are able to effectively colonize the root systems and stimulating plant growth and / or protecting against infections by plant pathogens These rhizosphere bacteria are sometimes called Plant Growth-Promoting rhizobacteria (PGPR) (Kloepper et al, 1986). PGPR can contribute to the improvement of plant resistance to biotic and abiotic stress such as salinity, drought and heavy metal toxicity (Canbolat et al, 2006)
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