Abstract
Ethylene and auxin both enhance cell elongation growth in the rachis of the frond of Regnellidium diphyllum. Measurements of the stress relaxation modulus of the walls of methanol-killed rachis segments show that both auxin and ethylene cause an increase in cell wall extensibility, that the effects are additive, and that they occur in the presence of hypertonic solutions of mannitol that preclude cell elongation. The results are taken as evidence for the operation of two separate mechanisms for cell wall loosening.
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