Abstract
Summary Gibberellic acid (GA 3 ) as well as salicylic acid (SA) increased the alkaline and acid phosphatases activity in the stem and the leaves both in continuous light and under 8 hr photoperiod. New bands of alkaline (Rms 0.30 and 0.80) and acid phosphatases (Rm 0.05) developed in plants treated with GA 3 , and SA under both photoperiods, but in watertreated controls only under 8 hr photoperiod. These bands developed with 1-3 SD cycles and may therefore be associated with floral bud initiation. A band of acid phosphatase (Rm 0.85) appeared in plants treated with GA 3 or SA under both photoperiods. As this band is absent in water-treated controls, it may be associated with induction caused by these chemicals. In contrast, an isoenzyme of alkaline phosphatase (Rm 0.56) developed in GA 3 -or SA-treated plants but only under 8 hr photoperiod and it may be connected with shortday caused induction.
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