Subject: monocot hormones

From: Michael Gorsuch <[email-masked]>
Date: Fri, 11 Aug 1995 02:16:45 -0700

Could anyone give me some information about hormone sinks and wells in a 
monocot such as grass.  Also where exactly is the shoot meristem located 
in grass?

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From: Marianne Oprisko <[email-masked]>
Date: 12 Aug 1995 05:34:09 GMT

>monocot such as grass.  Also where exactly is the shoot meristem located 

While I don't have the information about hormone 'sinks' and 'sources'
(a more proper term unless you mean storage area) right on hand, I can 
give you a quick answer to the shoot meristem location.  Monocot shoot 
meristems are located at the *BASE* of the leaf *NOT* the tip.  This
is very different than dicots used as examples in most 
botany/horticulture classes.  This is why you must cut your turfgrass 
(lawn) several times during a week to keep it at the same length.  Even
though you cut the tips of the leaves off the plant still lives and 
grows.  

A word of warning from someone who has spent the last seven years studing
monocot perennial turfgrasses. If it works one way in dicots never, 
Never, NEVER assume it works the same way in monocots.  

Marianne Oprisko
Work:[email-masked]
Home:[email-masked]
Voice Mail/Fax (409) 690-0738

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From: [email-masked] (Geeta Bharathan)
Date: 12 Aug 1995 13:27:50 GMT

Marianne Oprisko ([email-masked]) wrote:

: While I don't have the information about hormone 'sinks' and 'sources'
: (a more proper term unless you mean storage area) right on hand, I can 
: give you a quick answer to the shoot meristem location.  Monocot shoot 
: meristems are located at the *BASE* of the leaf *NOT* the tip.  This

I assume you mean the intercalary meristem at the base of the grass leaf. 
The shoot apical meristem of the monocot is, as may be expected, at the 
apex of the shoot: the stem tip.

And I'd like to add also that not all monocots have the "typical" linear 
leaves with a basal intercalary meristem. In other words, all monocots 
are not grasses, or even lilies. There are aroids and alismatids and yams 
that are organized rather differently.

-- Geeta

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From: hovav <[email-masked]>
Date: Sat, 19 Aug 95 12:30:13 PDT

pleas give summery here or in biosci.grasses group.
If you get too little info 
come back to me for discussion.
hovav

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From: [email-masked] (MC^2)
Date: Tue, 22 Aug 1995 10:36:19 -0800

> monocot such as grass.  Also where exactly is the shoot meristem located 

Meristems and young leaves are indeed presumed auxin source sites. The
shoot meristem is wrapped by existing leaves, and can be found by peeling
them away from the stalk.

As for leaf meristems, the books that propose that dicot leaves grow
meristematically at the edges are wrong, as is pretty definitively shown by
any clonal analysis experiment published to date.