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Stimulation or inhibition of NRE of P. fluorescens (relative to the control) by different fractions of root exudates from HZ1 and WX3 under natural (a) and aseptic conditions (b). The NRE of the control was 34.65 ± 0.12 %. Values are mean ± SE from three replications. Different letters indicate significant differences at P < 0.05 by LSD test
