Minutes and Agenda 2-23-10

Minutes for the POC Conference Call 2-23-10

Minutes of the meeting have been added in italics to the end of each agenda item. -RW

Agenda:

1. Discuss the Plant Structure parent terms that were defined at the meeting in Ithaca- these have been posted on Sourceforge for people to comment:

* plant cell

New def: A cell, the basic functional unit of a plant, that has as its parts a maximally connected lumen, the contents of this lumen and the surrounding plant cell wall.

Comments: Reference the definition of cell in GO(GO:0005623), see GO for definition of cell also: applies to living or dead cells

Note: There is no "lumen" term in GO- Ramona will request it. Raven, Evert and Eichhorn define the lumen as: "the space bounded by the cell wall".

Def: maximally connected lumen ?? is there a simpler way to word this?

Comments from DWS: "For me lumen has no meaning in this context. The lumen basically has no contents beyond space. It is the space inside the cell wall that is left after the protoplasm dies"

"Suggest using "basic structural unit" instead of "basic functional unit". In terms of function, isn't an organelle more basic?"

Proposed new definition (by RW and DWS): A cell that is or was part of a plant, is the basic structural unit of a plant, and may be dead at maturity.

Comments: See GO term GO:0005623 for definition of cell, and GO term GO:0009505 for definition of plant-type cell wall. A plant cell that is dead at maturity will, such as a fiber cell, consists of only the plant cell wall and its lumen.

We decided that much of the existing proposed definitions was redundant with GO, and we should have simpler definitions. Egg and sperm are not cells – nucleus with membrane – so definition of cell is still okay. Other parts of defintion should go in the comments.

Final defintion: A cell that is part of a plant and that has as its parts a plant cell wall.

Comments: Be sure to add cross references to GO for definitions of cell and plant-type cell wall (their term).

* plant organ

New def: -A plant structure that is a functional unit, is a proper part of a plant and includes portions of tissues of at least two different types which derive from a common developmental path.

(reworded slightly for readability)

Comments: May include individual cell types that are not part of tissues. example: guard cells which are part of the leaf, idioblasts

"proper" refers to not being the whole plant Examples: stem, leaf, root

Note: in 2-11-10 talk, Barry Smith suggested having child terms of plant organ: simple, compound and complex plant organs- tabled for next discussion.

We agreed that the definition was okay as is.

We must remember to include cross products to terms references in definitions, such as the reference here to portion of plant tissue.

* portion of plant tissue

New def: -A plant structure that consists of one or more cell types, organized into a structural and functional unit, and may include an intercellular matrix.

Comment: intercellular matrix- def: middle lamella- "layer of intercellular (between the cells) chiefly, pectic substances, cementing together the primary walls of contiguous cells ( ref: Evert, 3rd ed 2006)

We decided on a new defintion.

Final definition: Plant structure that has as its parts multiple cells and is a proper part of an organ. Comment: These cells are organized into a structural unit, and may include an intercellular matrix.

2. Whole plant was redefined at the Ithaca meeting as "A plant structure which is a whole organism." and gametophyte and sporophyte were moved under it.

But after much discussion (see Minutes 2-16), it was decided that it would be better to move all terms that are currently under gametophyte and sporophyte under whole plant, and make gametophyte and sporophyte siblings of 'whole plant' These changes were made and we can look at the results in the PO-dev browser .

3. in vitro cultured cell, tissue and organ was moved out the Plant Structure class and made a separate class. def: "Isolated and grown plant protoplast, cell, tissue and organ, involving, as a common factor, growth of microbe-free plant material in sterile environment, such as sterilized nutrient medium in a test tube or petri dish."

4.New parent terms proposed by Ramona:

*cardinal organ part def: A plant structure that is a direct or immediate part of an organ that is often maximal(?) but is smaller than the organ itself. Examples include lobe, operculum, neck, petiole?, leaflet. -tabled for next discussion.

* collective plant structure def: A plant structure that is composed of multiple organs but is not an organ. (Maybe something about a bona fide boundary, some way to distinguish it from whole plant). Examples: flower, perianth, inflorescence. collective structure or compound organ? -tabled for next discussion.

5. Term request from TAIR for "gamete"- proposed (RW): add gamete to the ontology (is_a parent, plant cell), with sperm cell and egg cell as siblings under a common parent 'gamete'. -tabled for next discussion.

6. Assignment of Term numbers:

We need a set of numbers for the POC curators ( Lol and Ramona, mostly)- existing:

Group identifier range (from-to)

TAIR: 0000001-0005000

Gramene/OSU: 0005001-0010000

IRIS-IRRI: 0010001-0015000

MaizeGDB: 0015001-0020000

UMSL: 0020001-0025000

New numbers to be added:

0025001-0030000 PO Consortium

0030001-0035000 NYBG

0035001-0040000 Cornell/MAG

Action item: Update on POC webpage and PO wiki

7. Next conference call- Tues Mar 2nd at 11 am PST