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pH modification of the chicory apoplast shown by color changes of pH indicator solutions after inoculation with a suspension of E. chrysanthemi 3937 wild-type (WT) and phoP and phoQ mutant strains in 10 μM MgCl2 at 6 h. BP, bromocresol purple (pH 5.2 to 6.8); PR, phenol red (pH 6.4 to 8.2).
