SO the tissues containing the enzyme seem to be autonomous. To add to the
complexity, even with the same species (e.g., pea) some researchers find effects
of the axis while others do not! We should be clear, however, that the increase
in extractable enzyme activity in the absence of the axis does not necessarily
reflect the change in activity within the storage tissue itself. Some enzymes are
sensitive to product inhibition, and their activity ceases when the products of
even limited reserve hydrolysis accumulate, a situation that would occur if exit
of materials was impeded by the absence of the growing axis. Thus, the enzyme
would be inactive in vivo but active when extracted and assayed in vitro.