stylar ridge vs stylar ridge (abortive)?

[Vincent, Leszek]

Hi Chih-Wei,

 

Please see my comments below in green.

 

Leszek

*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*
P. Leszek D. Vincent Ph.D., FLS
Division of Plant Sciences
215 Curtis Hall
University of Missouri-Columbia
Columbia
MO 65211-7020
USA
Ph: (573) 884-3716; Skype VoIP: phytosynergy; Fax:(573) 884-7850;
Email: Leszek at missouri.edu
Plant Systematist
Associate Curator, Dunn-Palmer Herbarium (UMO);
Research Associate, Missouri Botanical Garden (MO), USA;
*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*

________________________________

From: Chih-Wei Tung [mailto:cwt6 at cornell.edu] 
Sent: Wednesday, April 25, 2007 12:35 PM
To: Vincent, Leszek
Cc: Schaeffer, Mary L.
Subject: stylar ridge vs stylar ridge (abortive)? 
Importance: High

 

Hi Leszek,

 

Mary Schaeffer requested several anatomical terms which are currently
missing in PO but presented in MaizeGDB at this time, as seen here:

 

stylar ridge of lower floret of pedicellate spikelet of ear

stylar ridge of lower floret of sessile spikelet of ear

stylar ridge of upper floret of pedicellate spikelet of ear

stylar ridge of upper floret of sessile spikelet of ear

 

Initially, I was thinking to place these four terms as child terms [part
of] of followings respectively, 

 

# PO:0006424 : gynoecium of lower floret of pedicellate spikelet of ear
( 0 )

# PO:0006423 : gynoecium of lower floret of sessile spikelet of ear ( 0
)

# PO:0006426 : gynoecium of upper floret of pedicellate spikelet of ear
( 0 )

# PO:0006425 : gynoecium of upper floret of sessile spikelet of ear ( 0
) 

 

but now I am little bit confused after seeing the following terms in Zea
ontology, 

 

term: stylar ridge (abortive) of lower floret of pedicellate spikelet of
ear

id: ZEA:0015102

definition: The gynoecium development of the lower floret begins with
the production of a ridge on the abaxial surface of the apical meristem
of the floret, distal to the third stamen (which later degenerates).
This is the stylar ridge. While the development of this stylar ridge is
very similar to that of the upper florets, the development does not
proceed beyond the early ridge stage.

 

term: stylar ridge of upper floret of pedicellate spikelet of ear

id: ZEA:0015101

definition: The gynoecium development of the upper floret begins with
the production of a ridge on the abaxial surface of the apical meristem
of the floret, distal to the third stamen (which later degenerates).
This is the stylar ridge. Continued overgrowth of the shoot apex (which
becomes the ovule primordium) by the ring of stylar tissue leads to the
formation of the stylar canal, which is detected as a slight
protruberance on the mature ovary.

 

My question is that the four terms Mary requested are not abortive
through ear development, right? are they still present in the mature
ovary?

 

XX This structure, when aborted, is not present in the mature ovary. The
entire floret/flower aborts leaving just vestiges of its presence in the
spikelet.

 

The reason I asked is that we have " PO:0009078 : pistillode: A sterile
pistil, often rudimentary", I am wondering if these 4 terms would be
placed as child of "pistillode" as well?

 

XX I would not suggest you also using the term pistillode as that
structure is typically present on non-aborted gynoecia, implying that
much of the rest of the flower structure is present. In the case of Zea
this is not the case.

 

-          Leszek

 

Sorry for the long email,

 

Thanks,

 

Chih-Wei

 

 

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