new term: carpel anlagen

[kellogge]

We actually had this discussion when we were working on the growth  
stages, when we were considering P0 stage.  The anlagen are the first  
few cells that have acquired the identity of a particular structure, so  
the carpel anlagen will be a handful of cells that ultimately will  
divide and form a visible primordium.  This is completely parallel to  
PO:0001003, formation of leaf founder cells.  I would think that in  
terms of plant structure, DL should simply be annotated to carpel, and  
then we may need to define an early developmental stage for carpels in  
the development ontology.
Toby

On Feb 14, 2006, at 10:24 AM, Pankaj Jaiswal wrote:

> All I request is a term to annotate the DL gene's expression.  
> Definition can be modified based on your expert opinions. I am sure  
> people will be searching for 'carpel anlagen' after reading this  
> paper. So the best would be include these authors in your discussion,  
> since they used it.
>
> Pankaj
>
> Felipe Zapata wrote:
>
>> Not an expert either, but from the definition Pankaj suggests it is  
>> not too clear to me what exactly an anlagen is. Isn't it just a  
>> primordium?? also a group of undifferentiated cells that later become  
>> differentiated can be anything...(at least  to me). The group of  
>> cells that will become the eye isn't just the eye primordium??   
>> Pankaj suggests a temporal difference between anlagen and primordium,  
>> isn't it just a delusion?
>> F On Feb 14, 2006, at 9:43 AM, Pankaj Jaiswal wrote:
>>> I am not an expert on this. Therefore please read the text from the  
>>> citation below. Carpel anlagen is a presumptive region. Primordium  
>>> comes after the anlagen is recognized in terms of development.
>>>
>>>
>>> as far as definition of anlagen is concerned take a look at this
>>>
>>> Of German origin the term anlagen refers to any group of relatively  
>>> undifferentiated cells that is destined to become a particular group  
>>> of differentiated cells at a later time in development. It is used  
>>> to identify distinct cell groups in fly development and also in  
>>> vertebrate development for example the "optic anlagen" is the group  
>>> of cells that will become the eye in many vertebrates. The term is  
>>> related to fatemaps, defined cell lineages, and differentiation.
>>> www.smbs.buffalo.edu/bch/Courses/bch512/definitions2.htm
>>>
>>> Pankaj
>>>
>>> katica at acoma.stanford.edu <mailto:katica at acoma.stanford.edu> wrote:
>>>
>>>> Pankaj,
>>>> I must admit, never heard of 'carpel anlagen', but how is this  
>>>> different from 'carpel primordium'?
>>>> Isn't 'primordium' what 'analgen' means ? (just looking at Merriam  
>>>> Webster on-line)
>>>> Katica
>>>> On Tue, 14 Feb 2006, Pankaj Jaiswal wrote:
>>>>
>>>>>
>>>>> I need a new term to describe expression of DL gene in rice. The  
>>>>> term is carpel anlagen.
>>>>>
>>>>> definition: A presumptive region (carpel anlagen) on the floral  
>>>>> meristem, where carpel primordia would initiate.
>>>>> ref: PMID: 14729915
>>>>>
>>>>>
>>>>> Here is the cited text from
>>>>> Yamaguchi et al, Plant Cell 16:500-509 (2004)
>>>>> The YABBY Gene DROOPING LEAF Regulates Carpel Specification and  
>>>>> Midrib Development in Oryza sativa
>>>>> http://www.ncbi.nlm.nih.gov/entrez/query.fcgi? 
>>>>> cmd=Retrieve&db=PubMed&list_uids=14729915&dopt=Abstract  
>>>>> <http://www.ncbi.nlm.nih.gov/entrez/query.fcgi? 
>>>>> cmd=Retrieve&db=PubMed&list_uids=14729915&dopt=Abstract>
>>>>> 'DL expression was detected first in a few cells in the flower  
>>>>> meristem at the lemma side (Figure 4E) and then in cells at the  
>>>>> flank of the meristem (Figure 4F). These DL expression domains  
>>>>> corresponded to the presumptive region (carpel anlagen), where  
>>>>> carpel primordia would initiate. Shortly after this expression,  
>>>>> carpel primordia began to form. At this stage, DL was expressed  
>>>>> specifically and uniformly in carpel primordia (Figures 4G to 4I).  
>>>>> No expression was detected in the flower meristem (Figures 4E and  
>>>>> 4F) or the ovule primordium (Figures 4G to 4I). By contrast,  
>>>>> expression of DL was not observed in dl-sup1 mutants throughout  
>>>>> flower development (data not shown). Thus, the expression domains  
>>>>> of DL are restricted to the carpel anlagen and the carpel  
>>>>> primordia, and these expression patterns of DL are consistent with  
>>>>> its specific role in carpel development.'
>>>>>
>>>>>
>
>
>
Elizabeth A. Kellogg
E. Desmond Lee and Family Professor of Botanical Studies
Department of Biology
University of Missouri-St. Louis
St. Louis, MO 63121
Tel: 314-516-6217
FAX: 314-516-6233
http://www.umsl.edu/services/kellogg/
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