Exudates  - Exudates are substances that contain photosynthate, and other substances made by the tree.  Percentages of photosynthate, and other substances made from photosynthesis and metabolism that can leave the non-woody roots as exudates into the rhizosphere, range from 5% to 40%.  The exudates leave by way of the rhizoplane to feed many of the living organisms of the soil.  These exudates are used as an energy source and building blocks by many soil microorganisms.  Trees pay their taxes, in a sense, with exudates.  As the symplast declines the amount of exudates increases.  Again, the rhizoplane is the site of the exudates. 

(See  A TOUCH OF CHEMISTRY, SHIGO, 1996) 
 
(See  TROUBLES IN THE RHIZOSPHERE, SHIGO, 1996)

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