Isotope dilution analysis indicated that epi-GA 1 was an arte-The plant-growth-promoting rhizobacteria (PGPR), Bacillus pumilus and Bacillus licheniformis, isolated from the rhizo-fact. Likewise, iso-GA 3 is also probably an artifact spontaneously formed during extraction and/or analysis. In both sphere of alder (Alnus glutinosa [L.] Gaertn.) have a strong growth-promoting activity. Bioassay data showed that the culture media, GA 1 was present in higher concentrations (130-150 ng ml − 1 ) than GA 3 (50-60 ng ml − 1 ), GA 4 (8-12 dwarf phenotype induced in alder seedlings by paclobutrazol (an inhibitor of gibberellin [GA] biosynthesis) was effectively ng ml − 1 ) and GA 20 (2-3 ng ml − 1 ). The data indicated that culture of both bacteria accumulate bioactive C 19 -gibberellins reversed by applications of extracts from media incubated with both bacteria and also by exogenous GA 3 . Full-scan gas in relative high amounts and that these GAs appear to be physiologically active in the host plant. The evidence suggests chromatography-mass spectrometry analyses on extracts of these media showed the presence of GA 1 , GA 3 , GA 4 and that the promotion of stem elongation induced by the PGPR GA 20 , in addition to the isomers 3-epi-GA 1 and iso-GA 3 . could be mediated by bacterial GAs.

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