root branches - new terms for consideration.

[Mary (Polacco) Schaeffer]

Toby,

Thanks for your very considered response. However, while I will gladly,
although maybe it's really sadly, admit to not being a root anatomy expert,
I still think we need a term(s) for one class of seminal lateral roots. I
have checked again (Kiesselbach, the photos  in the QTL paper, and then with
Ed Coe). They all indicate that there is a class of lateral seminal roots in
maize that come off the main 'stem':
"at the base of the first internode of the stem, just above the scutellar
node" (Kiesselbach p.17).

The QTL paper that got me into this, (Hund et al TAG 109:618-629 (2004) has
fairly clear photos that show these roots arising from a different part of
the embryo "stem" than the radicle, which is at the very bottom of the stem.
One is attached to this email. Is there some other information I need to be
looking at? The QTL paper references a work by Feix, Hochholdinger and Park
for the root nomenclature, a chapter in a book, eds by Waisel, Eshel and
Kafkafi 2000: Plant roots: the hidden half. Marcel Dekker, NY 2000.

FYI, the QTL paper reports on a correlation of seedling vigor and the length
of the seminal lateral root axes (aka axile per Feix et al) and also a bunch
of seminal root traits that don't affect seedling vigor but have to do with
extent 'branching' and length of the main axes of two seminal roots classes
- primary, aka radicle and lateral (as in off the main embryo stem, not the
radicle).

    mary

> From: kellogge <kellogge at msx.umsl.edu>
> Date: Fri, 5 May 2006 14:48:54 -0500
> To: po-dev at plantontology.org, "Mary (Polacco) Schaeffer"
> <SchaefferM at missouri.edu>
> Subject: Re: root branches - new terms for consideration.
> 
> 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/
> This message is for the designated recipient(s) only and may contain
> privileged or confidential information.  If you received it in error,
> please notify the sender immediately and delete the original.  Thank
> you. 
> 

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