ajt at rri.sari.ac.uk
Sat Apr 13 12:47:20 EST 1996
ecoli at cix.compulink.co.uk ("K N and P J Harris") said:
> Root exudates don't exist.
> This is strong stuff. Albert Rovira, Jim Lynch and a whole host of > other
> soil microbiologists had better just pack up their tents and retreat.
> Time lapse photographs of root exudation taken at Long Ashton (copies
> still available) are not real. Those who claim that between 5% and 25%
> of the total photosynthate can be released as exudates are wrong ?
> Supporting references would be most welocome.
Sorry, I missed your reply to my message in bionet.plants: the news
server I use expires articles very quickly. I've just seen your message
in the www bionet archive ...
I didn't say that root exudate doesn't exist!
I said that it came primarily from the root cap ("... do not normally
'secrete' anything as such ...") and I do realise how much of the
available photosynthate that may represent.
If, however, you are saying that there is a specific secretory mechanism
that actively transports polysaccharides out of the root (ie. different
to the sloughing off/degeneration of the root cap) then I must admit my
If there is such a mechanism, that's interesting - tell us about it.
Dr. A.J.Travis, | mailto:ajt at rri.sari.ac.uk
Rowett Research Institute, | http://www.rri.sari.ac.uk/~ajt
Greenburn Road, Bucksburn, | phone:+44 (0)1224 712751
Aberdeen AB2 9SB, Scotland, UK. | fax:+44 (0)1224 716687
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