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nafex - [NAFEX] bark damage-- recap.

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  • From: "tanis cuff" <tanistanis@hotmail.com>
  • To: nafex@lists.ibiblio.org
  • Subject: [NAFEX] bark damage-- recap.
  • Date: Sat, 10 Dec 2005 23:01:23 +0000

I just ran thru the string on girdling, and had to go review what is phloem vs zylem, and wanted to clarify where in the plant the roots deliver up, and where the leaves deliver down.

One of the postings I think said the roots deliver via the thin growth layer just under the bark. That's incorrect. The roots deliver (water & minerals) via the tiny tubes in the interior or wood part of a trunk or branch. The leaves deliver carbs & such to the roots via the thin layer very close to the bark. (The inner tubes are the xylem, the outer is the phloem. And if I understand correctly, the famous 'cambial layer' is between the 2 and produces new cells for both.) This is why when a tree is girdled, it looks OK for a while: roots can still deliver juice to the leaves; but the tree will eventually fail because leaves are not delivering food to the roots. Unless it can throw a water sprout from below the girdle, or root suckers, either/both will then connect leaves with the roots again.






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