Overall, the fate of XPP and LRP cells is very plastic, determined by the balance between auxin and cytokinin. 3/x

Xin made two version of the LR tracing tool: inducible iRootTracker and constitutive RootTracker. You can monitor LR formation through agar plate under stereo fluorescent microscope and screen several roots/min, and the tracker appears to be very sensitive (nM scale IAA/BAP) 4/x