POC Conf. Call 9-10-13

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POC meeting, Skype Conference Call; Date: Tuesday Sept 10th, 2013 10am PST/1pm EST

In attendance: Laurel Cooper (OSU), Justin Elser (OSU), Justin Preece (OSU), Brian Atkinson (OSU), Dennis W Stevenson (NYBG), Pankaj Jaiswal (OSU), Barry Smith, Marie Alejandra Gandolfo (Cornell)

Absent: none

- please see the Items_for_future_meetings page, will be moved here before the meeting

multi-tissue plant structure development stage (PO:new)

  • Needs a parent term: multi-tissue plant structure development stage (PO:new), then the definitions can be re-written, currently a direct child of plant structure development stage (PO:0009012). This would also be the parent for seed development and plant organ development (see below)

Accepted, will post proposed definition on SF tracker

leaf development stage (PO:0001050)

  • See Google Doc for revisions in progress.
  • Need to look into non-vascular leaf development and see if it applies there as well, or if we will need separate terms for vascular and non-vascular leaves.
  • leaf development stage (PO:0001050): A phyllome development stage (PO:0025579) that has as a primary participant a leaf (PO:0025034).

Current structure: All these will be renamed "vascular leaf...."

Leaf dev stages.jpg

vascular leaf development stage and child terms

Proposed new term and definition:

  • vascular leaf development stage (new PO:0025570): A leaf development stage (PO:0001050) that begins with the onset of vascular leaf initiation stage (PO:0001051) and ends with the termination of the vascular leaf senescence stage (PO:0001054).


We will also need: * non-vascular leaf development stage (new PO:id): A leaf development stage (PO:0001050) that begins with the onset of non-vascular leaf initiation stage and ends with the termination of the non-vascular leaf senescence stage.

see also: moss phyllides, moss info and Background_info_on_Physco_biology_and_culture.


Add comment on how every stage can end in accidental death. Also mention something death being the canonical end point

New/revised child terms under vascular leaf development stage (PO:0025570)

  • Note: Use "during which" rather than "when" and "ends with the beginning of the..."
  • Each definition should have a consistent format (ie. begin with the termination/ends with the initiation).
  • Add a comment on the top level term about how all PSDS's may be terminated before reaching senescence stage.

vascular leaf initiation stage (PO:0007040)

vascular leaf initiation stage (PO:0007040): A vascular leaf development stage (PO:0025570) when localized cells of the peripheral zone (PO:0000225) in the shoot apical meristem (PO:0020148) transition from indeterminate growth to determinate growth and ends with the beginning of the vascular leaf expansion stage (PO:0001052). Comment: Cells in the primordium are not yet differentiated.

DWS: Should omit transition from indeterminate growth -> determinate growth. The peripheral meristem is always in the shoot apical meristem.

The cells in the SAM transition from anticlinal divisions to periclinal divisions, leading to a leaf primordium or bump. Usually in L2 or L3, rarely in L1.

Later mitosis ceases leaving the marginal or submarginal meristems and the leaf expansion stage is mainly cell expansion

Leaf development in Monocots need to be looked at as they have a basal intercalary meristem.

What are "localized cells"? The cell divisions are localized

revised Def'n: vascular leaf initiation stage: A vascular leaf development stage (PO:0025570) which begins with the onset of localized periclinal division in the peripheral zone (PO:0000225) and ends with the beginning of the vascular leaf primordium formation stage (PO:0001019).

can we leave out "in the SAM"?

This is when the analagen forms- later develops into the primordium

Create a 'vascular leaf primordium development stage'- move existing term

followed by a stage called 'vascular leaf surface polarity determination stage (synonym "pre-expansion stage)

DWS: Need to look at the organization of the SAM in ferns- Do they have the equivalent of a peripheral zone?: cup-shaped zone, runs from protoderm to protoderm, under the apical cell. DWS will look into it.

PJ- we should add a note that the concentration of auxin is highest under the spot where the primordium will form- the vascular leaf anlagen (PO:0025431).

Note that this comment is already there on the vascular leaf anlagen (PO:0025431) term


Leaf dev new.png


Note: Will have the new preceded_by relation added to order them

Children of vascular leaf initiation stage (PO:0007040)

Comment: The leaf primordium is not yet distinguishable.

vascular leaf expansion stage (PO:0001052)

  • vascular leaf expansion stage (PO:0001052): A vascular leaf development stage (PO:0025570) that begins with cell differentiation and cell expansion forming the leaf lamina (PO:0020039) and ends with the onset of the leaf fully expanded stage (PO:0001053).
    • new comment: The majority of leaf expansion is due to cell enlargement. The leaves of some plants may not have a conspicuous midrib or rachis.

Children of vascular leaf expansion stage (PO:0001052)- revised names and definitions:

this term should move up to be a child of vascular leaf initiation stage- how does this fit in with the 'formation of vascular leaf founder cells" stage

need to review this in terms of leaflet discussion

check "ligule (PO:0020105) primordium"- PO:id should be after the term, need to create a term ligule primordium


Discussion on these terms were tabled for the next meeting:

vascular leaf post-expansion stage (PO:0001053)

  • vascular leaf post-expansion stage (PO:0001053): A vascular leaf development stage (PO:0025570) that begins when the vascular leaf (PO:0009025) is fully expanded and cell expansion has ceased and ends with the onset of the vascular leaf senescence stage (PO:0001054).

Perhaps change term to vascular leaf mature stage

vascular leaf senescence stage (PO:0001054)

  • vascular leaf senescence stage (PO:0001054): A vascular leaf development stage (PO:0025570) that begins with the formation of a abscission zone at the base of a vascular leaf (PO:0009025) and ends with leaf separation and death.

Would omit formation of a abscission zone. Perhaps say ends with death of vascular leaf.

OBO Foundry Review of Plant Ontology

Content of the review has been moved to a gdoc

NSF PI meeting Sept 4th-6th in DC

  • PJ and DWS attended

Any news?

Upcoming meetings and Presentations 2013-2014:

No one from PO is planning to attend

  • PAG 2014 January 11-15, 2014 - San Diego, CA, USA
    • PJ has been contacted by PAG organizers; Suggest slightly new focus "Plant Ontologies and Systems Biology"
    • Ideas for speakers- someone from GO and others?>>
    • Registration is now open: PAG 2014. Early reg'n till Nov. 1st

Next meeting scheduled for Tuesday, Sept 24th, 2013 at 10am Pacific/1pm Eastern

-MAG has requested the meeting be moved to 10:30am Pacific/1:30 pm Eastern- would that works for the others in the group?

Works for most, BS may have a conflict once a month

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