Fig. 2From: Light dazzles from the black box: whole-cell biosensors are ready to inform on fundamental soil biological processesResponses of the P. fluorescens DF57 N3 lx-inserted constitutive biosensor in function of NO3 −-N availability in the rhizosphere. When biosensor takes up NO3 −-N bioluminescence decreases (a), when plant absorbs NO3 −-N biolouminescence increase (b)Back to article page