Dieback and stump senescence following decapitation of eucalypts in relation to auxin and phenols

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Abstract
Decline and death in totally defoliated, decapitated seedlings of Eucalyptusobliqua L'Her. was associated with a decrease in electrical impedance ratio and an increase in inhibitor concentrations and phenol leakage from tissue slices and sap expressed from the lower stems. These changes did not occur or were less marked in E. viminalis Labill. seedlings which survived decapitation. Presence of a single, small, upwardly directed shoot on decapitated E. obliqua seedlings or certain concentrations of indole-3-acetic acid delayed or prevented seedling decline in this susceptible species. It was concluded that leakage of compartmented phenols and (or) decline in auxin levels may play a role in stump senescence. Released phenols may be the primary determinant in seedling decline or may reflect changes in levels of a shoot-produced hormone such as auxin.
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