The lateral roots were fixed in formalin–acetic acid–methanol (FAA) according to the method of Livingston et al.62 (link). Blocks were sectioned with a Leica RM2016 rotary microtome at 5 μm. Fast green FCF and safranin O were used to stain the sections. The lignified or corkified cell wall and vessel element will be dyed red and other tissues will be dyed green. Images were captured with a Nikon Eclipse E100. Subsequently, the length of the meristematic zone and the number of meristematic cells were analyzed using ImageJ 1.53.
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