Fig. S1. GC-MS analysis of Phaseolus vulgaris leaf surface wash extracts. A peak with the retention time (19.6 min) of silated hydroquinone is indicated in a chromatogram section by an arrow (A). The corresponding mass spectrum (B) matched that of silated hydroquinone from the NIST Mass Spectrometry Data Center (C) and of an authentic standard (not shown).


Fig. S2. Population sizes of A. chlorophenolicus A6 on bean leaves that were sampled for RNA extraction and subsequent microarray analysis. ‘Wet’ refers to the PhylH treatment, while ‘dry’ refers to the PhylL treatment.


Table S1. Fold change in gene expression and corrected P values of A. chlorophenolicus genes on transcriptome arrays. Genes with a more than twofold change in gene expression and a corrected P value lower than 0.05 are indicated in bold. Comparisons were made between (i) high-humidity phyllosphere and agar surface treatment, (ii) low-humidity phyllosphere and agar surface treatment, and (iii) chlorophenol and agar surface treatment. Genes with a significantly different expression between high and low phyllosphere humidity treatments are indicated with asterisks (** = P < 0.05, * = P < 0.1).


Table S2. Compounds identified in three independent methanol extracts from the surface of bean leaves.

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