Concentrations of abscisic acid (ABA) in purified extracts of ‘#3 Indianapolis White’ were measured with a gas liquid chromatograph (GLC) and confirmed by combined gas chromatography-mass spectrometry (GC-MC). Apices contained 1½ to 3 times as much ABA as young or old leaves. Plants under long day (LD) treatment contained more ABA than those receiving short days (SD). ABA levels in the apices of plants sprayed with ethephon, (2-chloroethyl) phosphonic acid, and receiving 2 or 3 weeks SD, were lower than in plants given only 2 or 3 weeks SD.
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