term: columella

[Peter Stevens]

Seems OK to mre, but I would suggest not having "pollen wall 
coluella" as the name of the term: if we are in the pollen wall part 
of the ontology, "columella" alone will do the trick if the root 
"columella" has been obsoleted.  Applying any principle of qualifying 
terms based on the particular part of the plant where they are to be 
found will ultimately lead to wholesale "renaming" of terms. 
However, there is also a term "columella" used in fruits that applies 
to the central axis that persists after the rest of the fruit wall 
has separated and/or fallen off.  If we were to keep this term, then 
qualification might be needed, but again, one would be be in a 
totally different part of the ontology - qualification would then be 
driven by the needs of our particular controlled vocabulary....

P.


> 
><http://www.plantontology.org/amigo/go.cgi?action=query&view=query&search_constraint=terms&query=columella>
>
>
>Please correct me if I am wrong.
>
>As I understand it the term  PO:0020130 : central root cap is  a 
>region in the root cap and its synonym "columella cells" is 
>inappropriate. Also I see that a similar term  PO:0020132 : 
>columella root cap cell exists, so the synonym "columella cells" 
>should actually be added to  PO:0020132 : columella root cap cell 
>and removed from PO:0020130 : central root cap.
>
>A renaming of the term PO:0020132 : columella root cap cell to 
>"central root cap cell" will help, thus maintaining consistency with 
>parent term. Additional parent term for  PO:0020132 : columella root 
>cap cell is a must as follows.
>
>PO:0020130 : central root cap
>---part_of--PO:0020132 : columella root cap cell
>
>For consistency the renaming is suggested for  PO:0020133 : 
>columella root cap initial to "central root cap initial"
>
>-----------------------
>
>Just to clarify the usage of word "columella"
>
>My understanding is that the term "columella" is popularly called as 
>: The central part of root cap in which the cells are arranged in 
>longitudinal files (ref: Essau).  We are using the same definition 
>for defining the "central root cap" (syn columella cells) and they 
>are the same structure we are talking about.
>
>However there is a confusion by use of the word "columella" in the 
>term PO:0020014 "columella"  A rod-like element of the 
>sexine/ectexine, either supporting the tectum or a caput.
>
>
>To make it very clear we are talking about root cap columella in one 
>place and pollen wall columella in another can we do the renaming of
>
>PO:0020014 "columella" to "pollen wall columella"
>
>-Pankaj