POC Conf. Call 9-24-13

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POC meeting, Skype Conference Call; Date: Tuesday Sept 24th, 2013 10:30am PST/1:30pm EST

In attendance:

Absent:


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

leaf development stage (PO:0001050)


leaf development stage (PO:0001050)

Revised def'n: A phyllome development stage (PO:0025579) in which the development of vascular leaves (PO:0009025) and non-vascular leaves (PO:0025075) occurs.

    • No comment currently

Leaf dev top.png

non-vascular leaf development stage (new PO:0025573) and child terms:

* non-vascular leaf development stage (new PO:0025573): A leaf development stage (PO:0001050) that has as a primary participant a non-vascular leaf (PO:0025075). To be revised....

background references

see also: moss phyllides, moss info and Background_info_on_Physco_biology_and_culture.

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) which begins with the onset of the vascular leaf initiation stage (PO:0001051) and ends with the termination of the vascular leaf senescence stage (PO:0001054).
    • No comment currently

Vascular leaf dev.png

vascular leaf initiation stage (PO:0007040) and child terms:

  • Old def'n: The earliest histological evidence of leaf initiation, i.e, a change in the orientation of cell division both in the epidermis and in internal layers of the shoot meristem occurs at this stage (Poethig S, 1997, Plant Cell 9:1077-1087).

* Revised def'n: A vascular leaf development stage (PO:0025570) which begins with the onset of the vascular leaf anlagen formation stage (PO:0001003) ends with the termination of the vascular leaf primordium polarity determination stage (PO:0001052).

  • Revised Comment: Localized cell divisions in the peripheral zone (PO:0000225) transition from anticlinal to periclinal divisions.

Vas leaf intiation.png


vascular leaf anlagen formation stage (PO:0001003)

  • Old name and definition: formation of the leaf founder cells stage (PO:0001003): The initial stage of leaf development when cells in the SAM are already determined to form a leaf primordium, but the primordium itself is not distinguishable morphologically.
  • Revised name and definition: vascular leaf anlagen formation stage (PO:0001003): A vascular leaf initiation stage (PO:0007040) when the cells of the shoot apical meristem (PO:0020148) form a vascular leaf anlagen (PO:0025431).

Revised comment: The vascular leaf primordium (PO:0000017) is not yet distinguishable.

Added Revised synonym (exact): vascular leaf founder cell formation stage

Question: Are the leaf founder cells the same as the leaf analgen? It would appear so.

LEAF FOUNDER CELLS: A group of cells that encompasses several layers of the shoot apical meristem and from which a leaf primordium is derived. Founder cells do not function as stem cells but rather have a determinate fate and can be defined by histological, clonal and molecular criteria.

vascular leaf anlagen (PO:0025431): A phyllome anlagen (PO:0025430) that will give rise to a vascular leaf primordium (PO:0000017) and is part of a peripheral zone (PO:0000225) of a vegetative shoot apical meristem (PO:0008016). [source: PMID:14732442, POC:curators]

Comment: This is the region where you have the maximum concentration of auxin in the SAM (at least in a few species that have been studied).

See image: founder-cell population (FC) that will give rise to the next leaf primordium

vascular leaf primordium formation stage (PO:0001019)

-was formerly a child of leaf expansion, moved to leaf initiation stage

  • Old name and def'n: formation of leaf primordium stage PO:0001019: Stage of leaf development when leaf primordium is formed as a small protrusion on the flank of SAM. [source: TAIR:Katica_Ilic]
  • Revised name and def'n: vascular leaf primordium formation stage (PO:0001019): A vascular leaf initiation stage (PO:0001051) during which a vascular leaf primordium (PO:0000017) forms in the peripheral zone (PO:0000225) of the shoot apical meristem (PO:0020148). should this be "vegetative shoot apical meristem"?

Revised comment: The vascular leaf primordium (PO:0000017) develops from the vascular leaf anlagen (PO:002543).

vascular leaf primordium polarity determination stage (new PO:0025572)

* vascular leaf primordium polarity determination stage (PO:0025572): A vascular leaf initiation stage (PO:0001051) during which the vascular leaf primordium (PO:0004725) develops an adaxial side (PO:0004726) and an abaxial side (PO:0004725).

Comment: The vascular leaf primordium adaxial side (PO:0004726) is the closest side to the meristem. This stage leads to the development of a bifacial vascular leaf.

This term refers to the following two terms (children of phyllome primordium (PO:0025128); both have also been revised:

  • Old name and def'n: adaxial side of leaf primordium (PO:0004726): "A portion of phyllome primordium tissue that is the adaxial/inner side of the leaf primordium develops into the adaxial/upper leaf blade.
  • New name and def'n: vascular leaf primordium adaxial side (PO:0004726): "A portion of vascular leaf primordium (PO:0000017) that faces the shoot apical meristem (PO:0020148) and develops into the adaxial (upper) side of the leaf lamina (PO:0020039).
  • Old name and def'n: abaxial side of leaf primordium (PO:0004725): A portion of phyllome primordium tissue that is the abaxial/outer side of a leaf primordium and develops into the abaxial/lower leaf blade.
  • New name and def'n: vascular leaf primordium abaxial side (PO:0004725): A portion of vascular leaf primordium (PO:0000017) that faces away from the shoot apical meristem (PO:0020148) and develops into the abaxial (lower) side of the leaf lamina (PO:0020039).

Comments: The vascular leaves (PO:0009025) of some plants may not have an obvious adaxial or abaxial side such as the leaves of many xerophytic (arid-adapted) species. The adaxial and abaxial side may appear considerably more rounded and this could be due to early activity of the vascular leaf adaxial meristem (PO:0025401) and/or leaf abaxial meristem (PO:0025401).


Development of parts of the leaf

Need to consider if the following stage terms are appropriate under vascular leaf expansion stage (PO:0001052) due to the fact that these terms are for the development of specific parts of some plants.

  • formation of vascular leaflet primordia stage (PO:0004500): A vascular leaf expansion stage (PO:0001052) at which a leaflet primordium (PO:0025481) is initiated on the leaf rachis (PO:0020055) of a compound leaf (PO:0020043).
  • formation of ligule primordium stage (PO:0001021): A vascular leaf expansion stage (PO:0001052) when conical P3 leaf completely encloses SAM, and the ligule (PO:0020105) primordium is visible.
  • hood-shaped primordium stage (PO:0001020): A vascular leaf expansion stage (PO:0001052) when a hood-shaped primordium is formed, partially enclosing P1 and SAM, as in Poaceae.
  • rapid elongation of leaf sheath stage (PO:0001024): A vascular leaf expansion stage (PO:0001052) during which a rapid elongation of the leaf sheath (PO:0020104) occurs.

OBO Foundry Review of Plant Ontology

Content of the review has been moved to a gdoc


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, Oct 8th, 2013 at 10:30am Pacific/1:30pm Eastern

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