POC Conf. Call 6-14-11
POC meeting, Webex Conference Call; Date: Tuesday June 14th, 2011 10am (PDT)
This week's meeting is cancelled.
In attendance:
POC members:
Absent:
Collaborators:
Acceptance of the minutes from the POC_Conf._Call_6-7-11?
Items arising from previous meetings:
Conductive cells and tissues for vascular and non-vascular plants
THIS PART IS STILL UNDER CONSTRUCTION
Current parent: axial cell
axial cell (PO:0000081): A vascular cell derived from the fusiform cambial initial and oriented with its longest diameter parallel with the main axis of stem or root. [source: ISBN:0471245208]
Comment: These cells make up the axial system, also known as vertical or longitudinal system.
Existing descendents of axial cell:
sieve tube member (PO:0000289, alt: PO:0000286)
phloem fiber (PO:0004519)
xylem element (PO:0000273)
>tracheary element (PO:0000273)
>>tracheid (PO:0000301)
>>vessel member (PO:0002003)
>xylem fiber (PO:0000274)
>>fiber tracheid (PO:0000355)
>>libriform fiber (PO:0004520)
>>septate fiber (PO:0004521)
The term axial cell, and the current definition, describe a particular type of vascular cells found in wood. This is not appropriate as the parent for xylem and phloem cells. Also, the term axial cell is not widely used. "Axial system" is widely used to describe the vascular tissue in wood (in contrast to the radial system).
Suggest that we obsolete this term, possibly replace with new terms for axial system and radial system
At the bryophyte term meeting on 4-25-2011 (RW and MAG present), we decided that axial cell was not the correct term to use to describe all of the elongated cells associated with conducting tissue in plants. They are different cell types and have different origins, so they should not all be grouped together.
New proposed hierarchy (children of plant cell):
plant cell
>hydroid
>leptoid
>vascular cell (new term)
>>sieve tube member
>>tracheary element
>>>tracheid
>>>vessel member
>>phloem fiber cell
>>xylem fiber cell
>>other kinds of fiber cells
>ground tissue cell (PO:0025030)
>>stereid
>>collenchyma cell
>>sclerenchyma cell (PO:0000077)
>>>fiber cell (new term)
>>>sclerid (new term)
Proposed definitions:
fiber cell:
vascular cell:
