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Effects of exogenous abscisic acid (ABA) on growth and transpiration in seedlings of two ecotypes of Salix pentandra L. were studied in phytotron experiments. Application of ABA resulted in increased stomatal resistance, reduced transpiration and reduced growth rate. ABA did not induce cessation of apical growth in seedlings grown under a 24‐h photoperiod. The content of endogenous ABA in seedlings grown under 24‐h (LD) or 12‐h (SD) photoperiods was analysed from purified methanol extracts using gas chromatography and electron capture detection. No significant differences were found in the ABA contents of LD‐ and SD‐grown plants. SD‐induced cessation of apical growth was not associated with increased stomatal resistance or reduced transpiration rate.
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Johansen et al. (1986) studied this question.
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