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Fig. 1 | BMC Genomics

Fig. 1

From: Genome sequencing and assessment of plant growth-promoting properties of a Serratia marcescens strain isolated from vermicompost

Fig. 1

Phosphorus (a) and zinc (b) solubilization assays. Qualitative P and Zn solubilization assays were carried out with Ca3(PO4)2 (P-Ca) and ZnO as substrates, respectively. Halo formation around growing colonies was considered a positive result for solubilization. These results were used to compute the solubilization index (SI), which is the halo diameter divided by the colony diameter. Quantitative P solubilization assays were also performed using P-Ca or fluorapatite rock phosphate (P-rock) in the absence (black bars) or presence (gray bars) of S. marcescens UENF-22GI (c). pH variation in the culture media in the absence (black bars) or presence (gray bars) of S. marcescens UENF-22GI, indicating that P solubilization is probably driven by acidification (d). This assay was conducted in triplicates and statistical significance assessed by a by Student’s T-test (P < 0.05, indicated by asterisks)

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