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#12 dispersed meristematic cell
I would like to request the following new term:
name: dispersed meristematic cell (PO:new1)
ontology: structure
definition:
Procambial cell that is recruited in the mesophyll tissue layer and divide to form and extend the vascular tissue network of the leaf. These cells are defined here as dispersed meristematic cell (DMC).
lineage:
meristematic cell (PO:0004010)
--[i] dispersed meristematic cell (PO:new1)
reference: PMID 10545247, 16916932
Donghui
TAIR
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is it ok to place DMC as part of procambium (PO:0006074, def:A primary cambium which undergoes differentiation to form the primary vascular tissue)?
PO:0006074: procambium
-[p] PO🆕 dispersed meristematic cell(DMC)
-[p] PO:0006307:root procambium
-[p] PO:0006306:shoot procambium
please advise, thanks!
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In this paper PMID:10545247, the author mentioned a term "vein procambium" (page 417,in "Cell Differentiation" section), I am thinking to create a PO term for it.
PO:0006074: procambium
-[p] PO:new: vein procambium
-[i] PO:new: dispersed meristematic cell(DMC)
-[p] PO:0006307:root procambium
-[p] PO:0006306:shoot procambium
suggestion?
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what's the resolution on this term?
PO group please confirm!
two things.
is DMC always derived from procambial cell?
is procambial cell the only one recruited in the leaf mesophyll?
If not I suggest either creating following terms or annotate to generic term for meristematic cell.
leaf mesophyll procambium cell
--develops_from--leaf mesophyll meristematic cell
Additional parents apply as well.
I could only find one publication that referred to dispersed meristematic cells:
From PMCID: PMC1550771: Although most of the cells (in a developing leaf) begin to differentiate and enlarge, including those contributing to the lamina margins and trichomes, there are also meristematic cells that undergo division, resulting in the formation of specific cell types within each cell layer (1). For example, in the epidermis, meristemoids (6) are recruited from meristemoid mother cells and undergo a limited number of asymmetric divisions to form stomatal guard and stomatal-lineage ground cells (7). In a similar manner, procambial cells are recruited in the mesophyll tissue layer and divide to form and extend the vascular tissue network of the leaf (1 ref: PMID: 10545247). These cells are defined here as dispersed meristematic cells (DMCs). Each type of DMC proliferates for only a limited duration, and the temporal patterns of DMC cell-cycle arrest differ between tissues.
This definition implies that all DMC's *are* procambial cells, rather than being derived from procambial cells.
We have the term meristematic cell (PO:0004010): A cell synthesizing protoplasm and producing new cells by division and with only a primary cell wall.
We don't have the term procambial cell.
I suggest the following hierarchy:
meristematic cell (PO:0004010)
-[i] procambial cell (new)
- -[i] leaf procambial cell (new); synonym: dispersed meristematic cell
procambium (PO:0006074)
-[i] leaf procambium (new)
- -[p] leaf procambial cell (new)
I don't think it is necessary to have "leaf mesophyll procambium cell" as an intermediary, because leaf procambial cells will only occur in the mesophyll of a developing leaf.
Proposed defintions:
procambial cell: A meristematic cell that is part of a portion of procambium tissue.
part_of procabium
leaf procambrium: A portion of procambrium tissue that is part of a leaf.
part_of leaf
leaf procambial cell: A procambial cell that is part of a leaf procambium.
part_of leaf procabium
syn: DMC, dispersed meristematic cell
re. cwtung's request for a new term "vein procambium" below, I think we don't need this. All procambium gives rise to vascular tissue (by definition), so the phrase vein procambium is redundant.
I agree with Ramona on the "vein procambium" term. Procambium originates the vascular tissues, therefore it is redundant to say "vein procambium". We do not need the term.
There are several meristems involve in the development of a leaf, and depending on the leaf morphology they will act differently. The meristems involve in leaf development are basically the Apical, Adaxial, Marginal, Plate and Intercalary and they can function either simultaneously or sequentially (we will need to address these in the future). In any case, DMC as Ramona indicates ARE procambial cells. The hierarchy and definitions proposed by Ramona are OK with me
This sounds more like it came from animal development where cells migrate and/or are recruited. There is no recruitment in plants in that sense. This term is unnecessary.
Dennis Is right, there is never "cell recruitment" in plants. Some parenchyma cells can become meristematic, but they certainly do not migrate.
Alejandra (for some reason my comments appear as sender: nobody)
Raising the priority for discussion this week.
Procambial cell that differentiates in the mesophyll tissue layer and divides to form and extend the vascular tissue network of the leaf.
I would say we have to use the above. I would prefer to get rid of the term or change it some how.
At the POC meeting on 2-1-11, we decided to add three new terms:
-procambial cell (PO:0025258): A meristematic cell that is part of a portion of procambium. part_of procambium
-leaf procambrium (PO:0025259): A portion of shoot procambrium tissue that is part of a leaf. part_of leaf
-leaf procambial cell (PO:0000063): A procambial cell that is part of a leaf procambium.
part_of leaf procabium
syn: DMC, dispersed meristematic cell
Comment: Leaf procambial cells may differentiate in the mesophyll tissue layer and divide to form and extend the vascular tissue network of the leaf.