Organ number: input needed please

[Tanya Berardini]

Thanks for your reply, Doug. Yes, each petal of the flower is an organ 
and therefore not quite like a lobe of a liver.   There are four types 
of structurally and functionally distinct floral organs: sepals, 
petals, stamens and carpels.   Together, they make up a flower.

Cheers,

Tanya

On May 22, 2006, at 11:37 AM, Doug howe wrote:

> You asked for input..so here is my fish-centric input on flower petals.
>
> The structure you show under "Current proposed structure" seems to 
> imply that each petal of the flower is an organ.  In my plant-naieve 
> view it seems like the flower itself would be the organ and the petals 
> would be parts of the organ..kind of like lobes of the liver or 
> something.
>
> I like the structure you suggest at the bottom as it is more direct 
> and appears to address more directly the observed role of the mutant 
> genes in regulating petal number.
> -Doug
>
> Tanya Berardini wrote:
>> Hi Development groupies,
>>
>> Jen, Suparna and I have been struggling with a couple of development 
>> terms and I'd appreciate your input to help us resolve it.  I've also 
>> posted this on the SF item but since you're not all likely to be 
>> following the planty terms, you're getting an extra special email 
>> from me.
>>
>> Gory details:
>>
>> http://sourceforge.net/tracker/index.php?
>> func=detail&aid=1438331&group_id=36855&atid=440764
>>
>> Short summary:  Wt Arabidopsis flowers are radially symmetric and 
>> have 4 petals.  There are Arabidopsis mutants that have fewer petals 
>> than the wt.  There are also Arabidopsis mutants that have more 
>> petals that the wt.    How do we represent the processes that the 
>> gene products are involved in?
>>
>> Current proposed structure:
>>
>> [i]pattern specification GO:0007389       ---[i] determination of 
>> organ number; NEW
>> ------[i]determination of floral organ number; NEW
>> ---------[i] determination of petal number ;  NEW
>>
>> ---[i] flower development GO:0009908
>> ------[p]determination of floral organ number ; NEW
>> ---------[i] determination of petal number; NEW
>>
>> ------[i] petal formation GO:0048451
>> ------------[p] determination of petal number; NEW
>> ------------[p] petal development; NEW
>>
>> But these terms are still too general.  What I'd like to add are 
>> terms like:
>> [i[ determination of petal number; NEW
>> --[p] regulation of petal number; NEW
>> ----[i] negative regulation of petal number; NEW
>> ----[i] positive regulation of petal number; NEW
>>
>>
>> Any objections to this (last) set of terms?  I'd much rather have 
>> these strings than 'regulation of determination of petal number' or 
>> 'regulation of petal number determination'.
>>
>> You can respond  in return to this email and I'll add it to the SF 
>> item or you can post directly to the SF item.
>>
>> Thanks for your time,
>>
>> Tanya
>>
>>