Abstract
This, paper reviews five premises which underlie the simple Münch-type pressure-flow mechanism of sugar transport in plants from source to sink. The validity of each of these has been found experimentally to be in doubt in functioning sieve tubes, but at least four of the five should pertain if the simple pressure-flow theory is valid. A brief survey of alternate suggestions of mechanisms for sugar transport is given in the light of recent findings; in particular, models which reconcile ATP-assisted flow with pressure flow are discussed.
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