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Re: Three layers in Hostas?



----- Original Message -----
From: "Jim Hawes" <hawesj@atlantic.net>
To: <hosta-open@mallorn.com>; <hawesj@atlantic.net>
Sent: Monday, April 16, 2001 2:11 PM
Subject: Re: Three layers in Hostas
**********************
Jim
I thought I had a "basic" understanding of the L 1, 11 , 111 concept, untill
the term " core" was introduced.  This started to sound more like a leaf
structure.  Just trying to make sure I was "keeping up"
Thanks
Ran
*********************


> Hi Ran,
>
> We are discussing the meristem only, according to Vaughn, Marcotrigiano,
> Dermen and Stewart, etc.etc. . The three layers correspond to the three
> layers of cells observed looking at a cross section of a meristem. These
> layers are one cell thick at the apex of the meristem  ( but may become
> thicker in a later stage of growth) and have been called by Dermen and
> Stewart whose work this is...LI, LII and L III.
>
> LI in monocots  develops into the upper epidermal layer and the  border
> tissue in a periclinal chimera. The L II develops into the central part
 the
> medio part) of a mediovariegated leaf, for example,   part of the  scape
> tissue, and  the ovule tissue in the seed pod. The mesophyll or palisade
> cells between cutin  and the upper and lower epidermis cells, as seen in a
> cross section of a leaf,  could be of either LI or LII derivation
 depending
> upon where you are looking). ..L III does not exist in the leaf according
to
> Vaughn, only on other parts of the plant such as roots, rhizome tissue,
etc.
> The hangup, I believe,  is that Joe has said he thinks that central layer
> means "core"? layer of the plant. I think that what Vaughn meant when he
said
> central layer ( or central tissue) is the one between LI and LIII in the
> meristem. I don't know what the "core" means unless it means L III tissue
of
> the plant. But this is Joe's term. Let's ask him.  Who knows???..I have
been
> wrong before. What do you say Joe? Did I interprete this wrong?
>
> Jim
>
????/////////???????///////////?????????////////////??????????//////////////
//??????????/////////////
>


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