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Expression of PexpR-lacZ in S. meliloti 8530 (WT) and S. melilotiΔqsrR mutant treated with either 500 mg L-1 WSHM or 2% alfalfa seed exudates (E), respectively. Alfalfa seed exudates were used to assess whether WSHM could repress expR expression in a manner similar with plant signal. Data are expressed as average ± SEM for three replicates. Different letters indicate statistical significance as assessed by Duncan tests (P < 0.05).
