POC Conf. Call 11-18-13

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POC meeting, Skype Conference Call; Date: Tuesday Nov 18th, 2013 10:30am PST/1:30pm EST

In attendance:

Absent:


Wrapping up the vascular leaf development stages:

vascular leaf differentiation stage (new PO:0025574)

  • Revised def'n: vascular leaf differentiation stage (new PO:0025574): A vascular leaf development stage (PO:0025570) that begins with the formation of procambium (PO:0025275) and protoderm (PO:0006210) and ends with the formation and differentiation of the leaf epidermis (PO:0006016) and leaf vascular system (PO:0000036) and all the specialized cells of the vascular leaf.

Last week we discussed utilizing the meristem layers L1, L2, and L3 in the definition, but these are really part of the shoot apical meristem at an earlier stage. Are these layers also part of the leaf primordium???

vascular leaf expansion stage PO:0001052

old name and def'n: 2 leaf expansion stage (PO:0001052): Stage of leaf development which begins when cell differentiation and cell expansion occurs and finishes when the leaf reaches its full size.

Proposed revised name and def'n vascular leaf expansion stage (PO:0001052): A vascular leaf development stage (PO:0025570) during which vascular leaf size increases primarily through cell expansion.

Proposed comment: During this stage leaf shaping (GO:0010358) occurs which is defined as the developmental process that pertains to the organization of a leaf in three-dimensional space once the structure has initially formed.

  • Note: The majority of cell division occurs early in leaf development and cell expansion is the major agent of leaf expansion link or see above image.

Refer to the GO term: cell growth GO:0016049: The process in which a cell irreversibly increases in size over time by accretion and biosynthetic production of matter similar to that already present. synonym: cell expansion.

Revised comment: During this stage, the process of cell growth (GO:0016049) occurs, defined as the process in which a cell irreversibly increases in size over time by accretion and biosynthetic production of matter similar to that already present. synonym: cell expansion.

Children of vascular leaf expansion stage:

See Leaf Development Stages gDoc

These are stages of development of the parts of the leaf; currently is_a children of leaf expansion stage:

vascular leaf post-expansion stage (PO:0001053):

old name and def'n: 3 leaf fully expanded stage (PO:0001053): Stage of leaf development when leaf is fully expanded.

Proposed new Name and def'n: vascular leaf post-expansion stage: A vascular leaf development stage (PO:0025570) that begins when the vascular leaf (PO:0009025) is fully expanded and ends with the onset of the vascular leaf senescence stage (PO:0001054).

from 9-10-13: Perhaps change term to "vascular leaf mature stage", or maybe keep the "leaf fully expanded stage"???. Examples of leaves with indeterminate growth, ferns, viney leaves, some Mahogany plants, but they are the exceptions. Could add as a comment (get names from DWS).

vascular leaf senescent stage (PO:0001054)

  • vascular leaf senescent 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. Need to add the references to the GO terms.

Need to look at this more- abscission zone (PO:0000146) starts in the petioles (are part of the leaf), starts with cell senescence, should refer to 'point of attachment'. Don't need to specify where the abscission zone forms. Note all leaves abscise, end with death of the vascular leaf

Need to review leaf senescence- see plant cell resource


Links to Relevant References- vascular leaf development

Upcoming meetings and Presentations 2013-2014:

  • PAG 2014 January 11-15, 2014 - San Diego, CA, USA

The deadline for Early Pre-Registration was November 1, 2013. Poster abstract submission date is Nov. 12

Systems Biology and Ontologies Workshop

Link to: Googledoc

Confirmed speakers:

  • Barbara Ambrose, NYBG
  • Stefan Rensing, Marlburg Germany
  • Trey Ideker, UCSD School of Medicine, San Diego, CA
  • Jim Beynon, Warwick University, Coventry, United Kingdom
  • Sushma Naithani, Oregon State University
  • Laurel Cooper, Oregon State University

Next meeting scheduled for Monday, Dec 10th, 2013