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Comparative investigations on the metabolism of gibberellin a 1 gibberellin a 3 and gibberellin a 9 in cell suspension cultures of lycopersicon esculentum and in different intact plants



Comparative investigations on the metabolism of gibberellin a 1 gibberellin a 3 and gibberellin a 9 in cell suspension cultures of lycopersicon esculentum and in different intact plants



Biochemie und Physiologie der Pflanzen (BPP) 175(8-9): 797-805



Cell suspension cultures of L. esculentum rapidly converted [1,2-3H] GA1 into GA8 and its glucoside whereas labeled GA3 showed a limited metabolism. This behavior was consistent with the fate of both gibberellins in higher plants. In cell suspension cultures and intact plants of tomato [2,3-3H]-GA9 was specifically 13.alpha.-hydroxylated to give GA20. Cucumis sativa seedlings yielded the isomeric GA4 through 3.beta.-hydroxylation of labeled GA9. Structure elucidation was carried out by chromatographic, chemical and enzymatic methods. The observed specificity of GA9 hydroxylation in cell cultures of tomato proves this is a suitable substitute of intact plants for metabolic and enzymatic investigations.

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