root branches - new terms for consideration.

[kellogge]

Hi Mary -
   Not quite sure what is meant by an axile root, but here's an attempt 
at a response:

The primary root is at one pole of the embryo and is the first root out 
of the seed.  Any root that branches off that is a lateral root.  In 
grasses, the primary root and its lateral roots (i.e. branches) die 
fairly soon after germination.  At the same time, roots form from the 
scutellar node and nodes higher on the shoot.  These have been called 
adventitious roots in the past, but most morphologists are trying to 
get away from using the term adventitious (since it implies that they 
are somehow in the wrong place whereas they are of course quite 
normal), and instead call these shoot-borne roots.  Each of these 
shoot-borne roots makes lateral roots, and lateral roots can form on 
the lateral roots. I'd prefer not to introduce the term "branch" for 
roots.

   I'm not sure what the phenotype was in the QTL study, but presumably 
it would be more or less shoot borne roots, more or less lateral roots, 
etc.

Toby


On May 5, 2006, at 1:50 PM, Mary (Polacco) Schaeffer wrote:

> Working with Leszek, I have not been able to find terms that describe 
> the branches and the main axes, aka axile, of roots. To adequately 
> annotate root architecture QTL for  reported traits to do with 
> branching, it would be helpful to add terms:
>
>> primary root branch
>>  lateral root branch
>>  adventitious root branch
>>
>
>  If we add those terms we should consider changing the current ones, 
> eg primary root, to a term specifying the main axes,  or preferred I 
> would think, have an additional term for the axile:
>    eg  primary root
>              primary root axile
>              primary root branch
>
>  What do you think?
>
>   mary
>
>
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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