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Hypothetical model for the proposed link between D14L signalling leading to increased SL production and number of hypodermal passage cells for SL export in petunia. When D14L signalling is active, SL biosynthesis and HPC density are increased [28∗∗,49∗∗], resulting in increased levels of SLs being exuded into rhizosphere. In the absence of D14L signalling, a lower number of HPCs and the basal level of SL biosynthesis results in lower levels of SLs being exported out of the root.
