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Root growth force, pressure and rate were measured for young (2-4 days) maize seedlings using a strain gauge technique at oxygen concentrations ranging from 0 to 20 ’7 0. The oxygen concentration was varied around the whole seedling or around its root tip. Both root growth force and pressure as well as the growth rate of the constrained roots decreased when 02 concentration was below 3-5 07. The plant response was more pronounced when the entire seedling was in the gas mixture with low 02 concentration than when the radicle only was subjected to oxygen stress. The maximum growth force of the radicles was 0.6 N before their deformation : this corresponded to the growth pressure 0.4 MPa-0.65 MPa.

The influence of external oxygen concentration on axial root growth force of maize radicles