new term: carpel anlagen

Tue Feb 14 14:18:24 EST 2006

I agree that this is developmental stage term, and, as far as structure 
ontology goes, this gene can be annotated to 'carpel primordium'. This 
term is currently not in PO, but should be added, we recently added 
several primordium terms, but this one skipped my attention. On one 
of recent ontology conf calls, we agreed to add remaining 
'primordium' terms in the Plant Structure Ontology.

Katica

On Tue, 14 Feb 2006, kellogge wrote:

> 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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