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Gibberellin A5 (GA5), which is not known to be native to carrot (Daucus carota L.), was fed as either high specific activity [1-3H]GA5 (HSA, 3.2 Ci/mmol) or low specific activity [1,2-3H]GA5 (LSA, 74 mCi/mmol) to cell suspension cultures of carrot. Gibberellins A1, A3, A6, A8 and their glucosyl conjugates were found as metabolites of HSA [3H]GA5, as were GA22, GA29 and GA5 glucoside and glucosyl ester, with all tentative identifications based on retention times on reversed phase C18 HPLC with radiocounting. From LSA [1,2-3H]GA5 feeds, GA1, GA3, GA6, GA8 and GA29 were identified by GC/SIM. For cells or medium, only 24 to 27%, respectively, of [3H]GA5 was metabolized; major metabolites were [3H]GA5 glucosyl conjugates (HSA and LSA feeds) and free [3H]GA1/3 (LSA feeds). The system may thus be useful for production of labelled GAs and GA conjugates, and especially for conjugates of GA5 and free GA6 without dilution by endogenous GAs.

The potential of cell suspension cultures of Daucus carota L. as a source of isotope labelled gibberellins. I. Metabolism of [3H]GA5.