I am studying the shoot apical meristem (SAM) in one monocotyledons and I don't understand very well how the cytohistological zonation described in dicotyledons could be applied to monocotyledons.

For example: in dicotiledons there is didatic separation of central zone, peripheral zone and pith rib meristem zone. This is a clearly separation based on the fate that the derivative cells will assume.

But what about monocotyledons? The atactostele pattern means that there is a desorganization of procabial strands. So, we have not found clearly the separation of cortex or pith, and, of course, of the peripheral zone or rib zone because in monocotyledons shoot is difficult to see on pith, for example the stem of maize.

Can anyone tell me how the monocotyledons shoot apical meristem is organized? Does the monocotyledons present the same cytohistological zonation comparing to Dicotiledons?

Thank you for the attention.