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Why does the floem gets affected when the bark gets damaged?

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Why does the floem gets affected when the bark gets damaged?

Postby finalfantasy » Fri Jan 31, 2014 3:59 pm

Hello.

Recently my teacher said that if the plant's bark somehow gets ruined, the plant will eventually die. She said that the floem gets damaged and therefore the glucose cannot be transported to the roots. My problem is that I do not really understand why the floem gets affected when the bark gets ruined (by for example a badger). So, I will be happy if one of you all can explain why it is like this. :)

Thanks in advance!
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Postby Babybel56 » Fri Feb 28, 2014 9:27 am

*phloem!

The phloem cells are loving cells, whilst the xylem are formed of dead cells. The xylem are on the inside of the vascular bundles, and eventually are used to create the dead heartwood at the centre of the trees.

This means the phloem are always on the outside the trunk, just beneath the periderm (bark). If you take off the bark, you are likely to damage the phloem as well. The phloem transport glucose from where it is produced (the leaves) to the roots so they can continue to grow.
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Postby JackBean » Fri Feb 28, 2014 3:15 pm

@Babybel56: *living cells

yeah, the phloem is basically part of the bark, so whenever you damage the bark down to the wood, you're destroing also the phloem.

However, phloem doesn't transport nutrients (and it definitely doesn't transport glucose) from leaves only to the roots. In reality, very young leaves function as sink instead of source: http://www.scri.ac.uk/scri/file/annualr ... SINKSO.PDF
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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