Biology Asked by Remi.b on January 19, 2021
How many cells are there in the apical meristematic tissue?
Looking at this picture…
, I would tend to think that there are few hundreds cells in the meristem tissue. But I guess this is a picture of a root tip and the answer will be much different if we look at big branches and big trunks of roots. Also, the answer will probably differ between monocots and eudicots.
Roughly speaking, how many cells are there in different apical meristematic tissues (root, branches, trunk, different species)?
Meristem size is a very controled, highly genetic feature. It doesn't change between big or small branch/root (The SAM and RAM are obviously different). There are very levels of potency in the meristematic tissue, so you should explain more which section of the meristem is of interest.
But the whole meristem is somewhat larger. If you consider the organizing center and cells that react to wushell by creating CLV1, CLV3 you get a few dozens. If you consider cells that express miR156, miR172 or AP2-like genes you can get a few hundereds.
The scale is similar between species but the number and genes used to asses it vary.
The meristematic zone is somewhat bigger than the promeristem but the cells are pluripotent with relative small mobility.
Answered by Hachiloni on January 19, 2021
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