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Colonization of wheat root surface by several strains of A. brasilense Sp245 and Sp7. (A) Sp7 pLA-lacZ; magnification, ×40. (B) Sp7-S pLA-lacZ; magnification, ×40. (C) Sp7-PM23 pLA-lacZ, magnification, ×100. (D) Sp7-PM35 pLA-lacZ; magnification, ×60. (E) Sp245 pLA-lacZ; magnification, ×40. (F) Sp245-M5 pLA-lacZ; magnification, ×100. (G) Sp245-M5 pAB2053Z; magnification, ×100. β-Galactosidase activity is revealed in situ by the blue color obtained from X-Gal staining.
