POC Conf. Call 3-8-11

POC meeting, Webex Conference Call; Date: Tuesday Mar 8th, 2011 10am (PST)

In attendance:

POC members:

Absent:

Collaborators:

Acceptance of the minutes from the POC_Conf._Call_3-1-11?

Issues arising from last week's meeting:

anther/sporangium parts

Currently, pollen sac is part_of anther, but this won't work for gymnosperms. Also, anther wall and its parts (such as tapetum) are part_of pollen sac.

We discussed two possible solutions:

1. Create specific terms for both angiosperms and other taxa (for example, have separate terms for microsporangium wall and anther wall).

2. Create general terms, then only create specific terms for angiosperms when there is something structurally different about the part in angiosperms.

These two solutions are not necessarily mutually exclusive.

For this solution we will need to use has_part relations instead of part_of relations in some cases.

Note: It is crucial that we get the software properly developed so that annotations will accumulate properly through has_part relations (this is also an issue for develops_from relations). Also, this is a problem if we have to strip the has_part relations

See below figures for possible solutions to dealing with annotations.

Figure 1: the current state

Other related terms

• anther lobe will be narrow synonym of pollen sac.

• theca (PO:0009069): is_a collective organ part, part of anther, has_part pollen sac.

• Microsporocyte (PO:0020047) is part_of pollen sac. Not appropriate for all plants (including gymnos). Should probably be part_of microsporangium, so it is more general.

Restructuring descendants of leaf (PO:0025034)

Annotations and has_part relations

Annotations should pass through has_part backwards, that is from parent to child (in the opposite direction of the arrow). Furthermore, they should only pass through has_part relations when the instance for which the annotation was created comes from a taxon in which the parent term is part_of the child term.

For example: In anther has_part pollen sac, anther is the child, and pollen sac is the parent. Annotation should never go from anther to pollen sac. Annotations should go from pollen sac to anther if they come from an angiosperms.

In order for this to work, the conditions under which annotations should pass through will have to be specified every time a has_part relation is added to the ontology. That means that any class in the PO that has a has_part tag will have to have additional tags specifying the conditions under which annotation should pass through the has_part relation. We would have to create a custom tag for this, perhaps a custom relation, that is conditional.

Note: A problem with this is that we currently have to remove the has_part relations in order to load the ontology on the browser. What will happen to the annotations when that happens?

Physcomitrella terms

See Terms requested by Physco group for a list of terms.

-This was identified as a priority, since if we can get their terms in by the next release, they will use PO instead of continuing to develop their own ontology.

The Moss Ontology (MO) has about 65 PSO terms. About 20 of those already exist or are trival to add to the PO (e.g. non-vascular leaf base, non-vascular leaf apex). Many of the terms will be fairly straight-forward to add, but some will require discussion.

They have requested about about 35 PGDSO terms. About 10 of those already exist. The others should be fairly easy to add once the PGDSO is restructured.

• Do we want to give MO/Physco terms their own number space? Maybe a subset of the NYBG number space.

Terms requested that are already in PO but need some work

epidermis (PO:0005679)

Current def: A portion of plant tissue composed of epidermal cells that develops from the protoderm and covers the surface of a plant structure. [source: POC:curators].

Comment: The epidermis can be composed of one or more layers of cells. In some species, the epidermis is replaced by periderm. Epidermis can also include trichomes and stomatal pores.

Growth in mosses (and other bryophytes?) results from divisions of a single apical cell. Branches or leaves form from division and differentiation of sub-apical cells. The moss apical meristem may differ from that of vascular plants, but it is still possible to call it an apical meristem

Is there a protoderm in non-vascular plants? (def of protoderm: A portion of meristem tissue that develops from the outer layer of an apical meristem and gives rise to a portion of epidermis.) If we consider that mosses have an apical meristem, then this definition is valid for moss.

Suggest leaving definition as is, adding to comment:

Proposed Comment: The epidermis can be composed of one or more layers of cells. In some species of vascular plants, the epidermis is replaced by periderm. The epidermis can also include trichomes, stomatal pores, root hairs, and rhizoids.

spore capsule

We have the term moss capsule (PO:0025232), but having a taxon name in the term name is not desirable, nor is having it defined based on its taxa. Suggest renaming it spore capsule and defining it based on its unique characteristics.

Want to have spore capsule as name, to distinguish it from the caspsule that is part of a fruit in e.g., Eucalyptus.

Current definition: A sporangium in mosses.

Proposed def.: A sporangium...

Comment: Found in bryophytes.

transfer cell

We have the term transfer cell (PO:0000078). Def: A cell with wall ingrowths (or invaginations) that increase the surface of the plasmalemma. [source: ISBN:0471245208] Comment: Appears to be specialized for short-distance transfer of solutes.

MO suggested definition: Specialized cell at the junction of the gametophyte and sporophyte that function in nourishing the sporophyte. [source: Bill and Nancy Malcolm (2006): Mosses and other Bryophytes, an illustrated glossary, second edition]

Are transfer cells always at the junction between the sporophyte and gametophyte? Do we want to include that in the definition or in a comment?

Do we want to add a specialized term for transfer cells in mosses? Are they different from other transfer cells?

Basal endosperm transfer cell (PO:0009018) is currently the only is_a child of transfer cell.

Comment from Barry via email: My instincts tell me that the reference to 'at the junction' is more central to the definition of 'transfer cell' then is the reference to 'ingrowths'. But in any case the definition would be overloaded to have both sets of information. One or other should be in a comment.

protonema, chloronema, caulonema

Below are the definitions from the Physcomitrella group:

• protonema - The filamentous stage of gametophyte development. Protonemal tissue is produced following spore germination or the regeneration of most tissues (whether gametophytic or sporophytic). In most moss species, protonemal filaments comprise two cell types, caulonema (q.v.) and chloronema (q.v.). Both types of filament extend by the serial division of their apical cells. Sub-apical cells may branch. (MO definition, from Celia Knight,Pierre-François Perroud,David Cove (2009): The moss Physcomitrella patens. The Annual Plant Review 36, Glossary)

(note from RW: Protonemata may develop from a spore or from a fragment of tissue.)

• chloronema - The assimilitory filaments of the protonemal stage of gametophyte development. Compared to caulonmeal filaments, the cells of P. patens chloronemal filaments contain many well developed chloroplasts. The cross walls of adjacent cells in chloronemal filaments are perpenicular to the filament axis. (MO definition, from Celia Knight,Pierre-François Perroud,David Cove (2009): The moss Physcomitrella patens. The Annual Plant Review 36, Glossary)

• caulonema - The adventitious filaments of the protonemal stage of gemtophyte development. Compared to chloronemal filaments, the cells of P. Patnes caulonemal filaments contain only fewer, less well developed chloroplasts. The cross walls of adjacent cells in caulonemal filaments are oblique to the filament axis. (MO definition, from Celia Knight,Pierre-François Perroud,David Cove (2009): The moss Physcomitrella patens. The Annual Plant Review 36, Glossary)

The Physco group classified protonema as whole plant, in which case it could be considered a life-cycle phase (part of gametophytic phase) in the PO. However, after the leafy part of the gametophyte develops from the protonema, the protonema still persists, so there is some part of the life cycle in which the protonema is not the whole plant.

Need to decide how to handle it. Suggest adding it as a plant structure. Maybe as a portion of plant tissue.

The MO classified chloronema and caulonema as is_a protonema, therefore is_a whole plant, but maybe they could be considered portions of tissue. Suggest that the chloronema and caulonema be part_of protonema. They are also thought of as growth phases, although they may persist after the gametophore develops.

MO has also requested terms for chloronema cell and caulonema cell.

• chloronema cell: The assimilatory filaments of the protonemal stage of gametophyte development. Compared to caulonemal filaments (q.v.), the cells of P. patens chloronemal filaments contain many well developed chloroplasts. The cross walls of adjacent cells in chloronemal filaments are perpendicular to the filament axis. (Celia Knight,Pierre-François Perroud,David Cove (2009): The moss Physcomitrella patens. The Annual Plant Review 36, Glossary)

• caulonema cell: The adventitous filaments of the protonemal stage of gametophyte development. Compared to chloronemal filaments (q.v.), the cells of P. patens caulonemal filaments contain only fewer, less well developed chloroplasts. The cross walls of adjacent cells in caulonemal filaments are oblique to the filament axis. (Celia Knight,Pierre-François Perroud,David Cove (2009): The moss Physcomitrella patens. The Annual Plant Review 36, Glossary)

Suggest we add new terms for protonema, chloronema, and caulonema as portions of plant tissue, chloronema cell and caulonema cell as plant cells, plus add protonema phase as part_of gametophytic phase, and possibly chloronema phase and caulonema phase as is_a or part_of protonema phase.

Proposed definition of protonema: A filamentous portion of plant (chlorenchyma?) tissue that develops directly from a spore.

Comment: The protonema is the first structure that develops in the gametophytic phase of mosses and ??other taxa. The term protonema is also used to refer to the phase of development in which protonemal tissue is produced (see PO:xxxxxxx protonema phase)

Proposed definition of chloronema: A portion of protonema that contains chloronema cells.

Comment: Generally, the development of chlornema procedes the development of caulonema. Only the caulonema, and not the chloronema, initiates gametophore buds.

Proposed definition of caulonema:A portion of protonema that contains caulonema cells and initiates gametophore buds.

Comment: Generally, the development of chlornema procedes the development of caulonema. Only the caulonema, and not the chloronema, initiates gametophore buds.

Proposed definition of chloronema cell: A plant cell that is part of a chloronema and contain many well developed chloroplasts and has cross walls of adjacent cells that are perpendicular to the protonema axis. is_a plant cell, part_of chloronema, participates_in protonema phase

Proposed definition of caulonema cell: A plant cell that is part of a caulonema and contains fewer, less well-developed chloroplasts than a chloronema cell and has cross walls of adjacent cells that are oblique to the protonema axis. is_a plant cell, part_of caulonema, participates_in protonema phase

Proposed definition of protonema phase: A plant life cycle phase that is part of the gametophytic phase in which protonema tissue is produced.

Comment: The protonema phase follows spore germination in mosses and ??other taxa.

When to obsolete terms?

If the definition of a term stays more or less the same, but the is_a parent changes, should the term ID remain, or should it be obsoleted and replaced by a new term with the same name?

Many people say that "if in doubt, obsolete," but this creates a lot of work and often confusion for our users.

We should establish a policy on when to obsolete in cases like this, ie: "best practises" guide.

See: PO_Developers_Guide

Upcoming meetings 2011:

* ICBO 2011 Second International Conference on Biomedical Ontology July 26-30, 2011 Buffalo, New York

ICBO

LC contributed to the workshop proposal "From Fins to Limbs to Leaves: Facilitating anatomy ontology interoperability" Authors: Melissa Haendel, Chris Mungall, Alan Ruttenberg, David Osumi-Sutherland and Laurel Cooper

Submitted: February 15th, 2011

- LC will attend and represent the PO. Invite other plant people? Will talk with Elizabeth Arnaud at the upcoming meeting.

-BS suggested we might want to submit a short paper which could be published in longer form later- see above

*Plant Biology 2011, Aug 6-10th, Minneapolis, Minn

Plant Biology 2011

Early-bird registration ends May 13.

Abstract deadlines: Your abstract must be submitted by March 11 if you want it to be considered for a minisymposium talk.

For inclusion on the program memory stick and in the program book, abstracts must be submitted by May 27.

* International Botanical Congress (IBC2011)

July 23rd-30th 2011, Melbourne, Australia

Registration is open Important dates

Symposium proposal was accepted, 'Bio-Ontologies for the Plant Sciences' under the Genetics, Genomics and Bioinformatics theme.

Dennis, Alejandra, Pankaj and Ramona are planning to attend.

See IBC 2011 Bio-Ontologies Symposium wiki page for more details