pavement cell

[planteome-user]

The current definition of pavement cell is:
Epidermal cell with characteristic sinuous anticlinal cell walls that overall give a jigsaw like appearance to the leaf epidermis.

There are many species in which the pavement cells are not sinuous. From my understanding, a pavement cell is an epidermal cell that is not a guard cell, subsidiary cell, trichome or socket cell. Papilla cell is_a pavement cell. I think bulliform cell is also a pavement cell.

Suggest a new definition: An epidermal cell that is not associated with a stomatal complex or trichome.

Any comments or suggestions?

Reported by: rlwalls2008

Original Ticket: obo/plant-ontology-po-term-requests/256

[planteome-user]

Epidermal pavement cells exhibit a wide range of sizes and shapes, those of the stem are normally highly elongated while those of the leaf are generally isodiametric with sinuous outlines. In grasses they are almost quadrangular, except for bulliform cells.

Pavement cells are the most unspecialized morphologically cells of the epidermis, although they are definitely mature.

Origin of the pavement cell: asymmetric division of a protodermal cell, gives origin to two cells, a larger one that will become a "pavement" cell and a smaller that will become the "meristemoid cell" which it is the precursor to the guard cell. This meristemoid cell will divide 1 to 3 times asymmetrically giving origin to a guard mother cell (GMC), this will divide once more symmetrically originating the two occlusive cells. This process is well establish for Arabidopsis. So although the stomatal complex is not associated with the pavement cell they share the same origin!

Although we do not need to address in the definition that they share the same origin, we can say that at maturity they are no associated.

Original comment by: magandolfo

[planteome-user]

At the POC meeting on 12-22-10, we decided on the definition:

A shoot epidermal cell that is relatively unspecialized at maturity.

Comment: May have sinuous anticlinal cell walls that overall give a jigsaw like appearance to the epidermis. Pavement cells are epidermal cells that are not directly associated with a stomatal complex or trichome at maturity, but they share similar developmental origins.

Original comment by: rlwalls2008

[planteome-user]

Name for general term will be epidermal pavement cell, to distinguish it from pavement cells in embryos.

Epidermal pavement cell is disjoint from guard cell, socket cell, subsidiary cell and trichome cell, and vice-versa.

Has children papilla cell and leaf pavement cell. Bulliform cell, leaf ab/adaxial pavement cell, long cell, and short cell are children of leaf pavement cell.

Original comment by: rlwalls2008

[planteome-user]

I am closing this item.

Original comment by: rlwalls2008

[planteome-user]

• status: open --> closed-fixed

Original comment by: rlwalls2008