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Re: CULT: Suberization

The following describes an oak stem.  Suberin & cork make up the dead
tissues that eventually become bark of a tree stem (branch, trunk).
Since iris rhizomes are modified stems, suberization is the process of
forming "bark" or a layer of dead tissue on the rhizome.

As an intermediate step, it seems like a freshly cut surface of a
rhizome would have to form some kind of meristematic (growing) tissue to
produce a cork layer. ?

I think roots also produce suberin (become suberized).

<Periderm usually arises in the subepidermal Cortex. Parenchyma
         cells become meristematic and form a Cork Cambium or Phellogen.
         produces radial files of cells towards the outside. These cells
are called
         Cork Cells or Phellem.  Suberin (a wax) is secreted into the
walls of the
         Cork Cells. This makes them waterproof and pathogen-proof. The
         Cells eventually die and form a dead barrier to the outside

Linda Mann east Tennessee USA zone 7/8

American Iris Society web site <http://www.irises.org>
iris-talk/Mallorn archives: <http://www.hort.net/lists/iris-talk/>
iris-photos/Mallorn archives: <http://www.hort.net/lists/iris-photos/>

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