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Re: Adventitious and dormant buds

Subject: Re: Adventitious and dormant buds
From: Jerry Ross
Date: Dec 27 2007 09:41:47
Adventitious> ORIGIN Latin /adventicius/ "coming from a foreign country"
[see '/advena/': a foreigner]; casual; extraordinary; accidental"
All the references that I can find state that the botanical meaning of
the word is no more than that the bud, shoot or whatever is growing in
an unusual ('foreign') location. Likewise 'epicormic' talks about where
the thing is, not whence it came...
And 'dormant' means, well, dormant. So clearly can't be applied with any
sense to an actively growing shoot.
None of these words actually mean what we are referring to, namely
whether a bud derives from 'ancient' meristem deep within the tree's
tissues, which has been growing out each year awaiting an opportunity to
sprout and which, because of its origin, is more likely to be firmly
locked into the plant's structure; or whether it's a more
'opportunistic' bud, being produced anew from tissues near the surface,
suggesting that it is more likely to be more weakly attached). 
The words 'endogenous' and 'exogenous' fit the bill though.

Glad to have got that off my chest.
Now - back to the eating and drinking.



-----Original Message-----
From: GuyM [mailto:meilleur7045@xxxxxxxxxx.net]
Sent: 21 December 2007 23:30 
To: UK Tree Care
Subject: RE: Adventitious and dormant buds

Here in the US, "adventitious" means newly arisen.  These buds are newly
formed.  "Dormant"--latent, or more precisely stated, suppressed buds,
are carried along in the cambium as the tree expands.  Shoots from these
preexisting buds are more likely to form buttresses, and thus be more
stable.




Mike Ellison wrote:

I can't lay my hands on sources at the moment but 'dormant' buds
originate from the primary shoot (original buds growing outwards with
each annual xylem increment) and adventitious buds occur when any
meristematic tissue, other than a primary shoot, produces bud initials.
There is research (that I have referenced on uktc in another thread),
which suggests that some species, Quercus robur for example, don't
produce adventitious buds and all of their epicormic shoots arise from
dormant buds, although someone recently showed me bud-like structures in
woundwood of Q. robur so perhaps it does produce adventitious buds.

Mike



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