new term: carpel anlagen

[Felipe Zapata]

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 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
>>>
>>> '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.'
>>>
>>>
>>>
>
>
> -- 
> Pankaj Jaiswal
> G-15, Bradfield Hall
> Dept. of Plant Breeding and Genetics
> Cornell University
> Ithaca, NY-14853, USA
>
> Ph. +1-607-255-3103 / 4199
> fax: +1-607-255-6683
>

..............
Felipe Zapata
Department of Biology
University of Missouri St. Louis
One University Boulevard
St. Louis, MO 63121 USA
p.314.516.7997
f.314.516.7997



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