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SUMMARY

The effect in solution culture of iron(II), acetic and butyric acids and ethylene on rooted cuttings of Sitka spruce and Lodgepole pine has been studied and compared with the effects of anoxia. A relative growth rate parameter is employed to reveal changes in the rate of root growth. Possible mechanisms of toxicity and detoxification are suggested and the greater tolerance of Lodgepole pine is discussed in relation to its superior gas transport system. Conclusions are drawn concerning the role played by each of the toxic factors in the field situation.