Plant growth regulators and amino acids released by Azospirillum sp. in chemically defined media

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AimsTo investigate the ability of Azospirillum sp., a facultative endophitic diazotrophic bacterium, to release plant growth regulators (PGR) such as polyamines, ethylene, indoleacetic acid and amino acids in both combined-N and N-free cultures.Methods and ResultsThe presence of those substances was analysed by HPLC. Azospirillum sp. is capable of releasing PGR and amino acids into the culture medium.ConclusionsThe type and quantity of the released substances varied, depending on the presence of combined-N in the medium.Significance and Impact of the StudyA better knowledge of PGR produced by Azospirillum sp. has been gained.

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