Résumé
Extracts of mature silver fir (Abies alba Mill.) needles, current-year, and one-year old (A) and seven to nine-year old (B), were purified by reversed and normal phase HPLC. Gibberellin (GA)-like compounds were detected by the Tan-ginbozu dwarf rice micro-drop bioassay and corresponding fractions were analyzed by GC-MS. GA^sub 9^ was present in small amounts, while a major component was a cellulase-hydrolysable GA^sub 9^ conjugate which was assumed to be GA^sub 9^ glucosyl ester. It is proposed that GA^sub 9^ glucosyl ester plays a key role in the regulation of endogenous GA levels in silver fir needles.[PUBLICATION ABSTRACT]