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. 2021 Nov 2;12:719504. doi: 10.3389/fpls.2021.719504

FIGURE 2.

FIGURE 2

Demonstration of minerals solubilization; phosphorus (P) by ASH11 (A) and ASH19 (B), zinc (Zn) by ASH7 (C) and ASH22 (D), and potassium (K) by ASH10 (E) and ASH22 (F); manganese solubilizing bacterial (MSB) strains were spot inoculated on Pikovskaya agar amended with tri-calcium phosphate and tris-minimal salt agar amended with zinc oxide for P and Zn solubilization; K solubilization was determined by inoculating MSB strains on mica-amended Aleksandrov agar media; these solubilization assays were incubated for 7 days and appearance of solubilization zones were considered positive for respective mineral solubilization; K solubilization zones were observed through diluting agar media with dilute iodine solution for 10 min; PSB, P solubilizing bacteria; ZSB, Zn solubilizing bacteria; KSB, K solubilizing bacteria.