Cambial divisions

Dr. David Starrett dstarret at BIOLOGY.SEMO.EDU
Wed Oct 30 19:17:24 EST 1996

>        Reply to:   RE>Cambial divisions
>My understanding, based on few observations (in roots only) and no literature
>that I can remember, is that the single PMC division you mention produces a
>cell that, itself, will divide one (more) time prior to maturation, and this
>division gives rise to the companion cell.  If you learn different, please let
>me/us know.
>Date: 10/30/96 7:19 PM
>To: Vance Baird
>From: "Dr. David Starrett"
>  While teaching plant anatomy, I came across the tidbit that xylem mother
>cells divide twice while phloem mother cells divide once.  When I brought
>this up to the class, one student asked whether that one division was the
>division producing the Companion cell.  I tried looking this up in a few
>texts, but found no answer.  Anyone have an idea whether the single PMC
>division yields the Sieve Tube Memebr plus companion cell?
>  Any thoughts would be appreciated!

*** Meaning that the PMC does eventually undergo 2 divisions the same as
XMC.  This is what I am curious about.  It is a bit misleading to state that
PMC goes 1 div, XMC 2.  

Dave Starrett

*                                                           *
*  Dr. David Starrett                                       *
*  Biology Department, MS 6200                              *
*  Southeast Missouri State University                      *
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