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This is a continuously updated archive of the Aroid-L mailing list in a forum format - not an actual Forum. If you want to post, you will still need to register for the Aroid-L mailing list and send your postings by e-mail for moderation in the normal way.
Re: Philodendron aerial roots
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From: dana at homecom.com (Dana Scholle) on 1997.11.19 at 19:46:41(1637)
I grow a lot of orchids, and I know that this is definitely the case with
these plants.. If, when repotting, you bury roots that had been growing
outside the medium, they tend to suffocate pretty quickly..
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At 09:33 PM 11/18/97 -0600, you wrote:
>>.. Sure, aerial roots
>>>have a different epidermal layer than ones that are in potting media but
>>>that is only because they are in air and not in media. But, when they find
>>>some type of media... they change.
>>
>>That's my point. My understanding is that subsurface roots are different
>>than aerial roots, even if the two zones exist on the same root. Burying the
>>aerial portion often leads to rot of the root. If the aerial portion hits
>>substrate and changes...I think the root is ok. Does this make any sense?
>>
>>Carlo
>
>This makes perfect sense from a biological standpoint. The root tip, just
>like the growing tip, has what are termed meristem cells, that is, cells
>that are actively dividing but may not have differentiated into specific
>cell type (leaf, stem, root hair or whatever), so probably when this
>meristem area first contacts some type of substrate suitable for rooting,
>the cells behave appropriately (i.e. begin to differentiate). Now if you
>bury this area rather than letting the root "feel" the ground first, you
>may well short circuit the normal rooting mechanism, leading to the
>observed rot.
>
>Don Martinson
>Senior Research Associate
>Department of Medicine
>Division of Endocrinology, Metabolism and Clinical Nutrition
>Medical College of Wisconsin, FMLH-West
>9200 W. Wisconsin Ave.
>Milwaukee, WI 53226
>(414) 259-3817
>dmartin@post.its.mcw.edu>
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