Abstract
Needles from seedlings of Picea abies grown in controlled temperature and photoenvironment, and from 3 m tall trees grown out-of-doors, were subjected to a short term (12 h) fumigation treatment with β-pinene. The water relations of needle tips and bases were measured at 4-h intervals during the fumigation period, using thermocouple psychrometers. Turgor of young needle tips declined significantly with fumigation. Fumigation did not decrease the turgor of needle bases or of mature needle tips. The response observed in this study may be related to membrane disruption under the influence of β-pinene. Juvenile needle tips appear to be more sensitive to β-pinene toxicity than mature needle tips or needle bases.
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