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


RESULTS
The presence of those substances was analysed by HPLC. Azospirillum sp. is capable of releasing PGR and amino acids into the culture medium.


CONCLUSIONS
The type and quantity of the released substances varied, depending on the presence of combined-N in the medium.


CONCLUSIONS
A better knowledge of PGR produced by Azospirillum sp. has been gained.
Thuler
D S
DS
Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brasil.
Floh
E I S
EI
Handro
W
W
Barbosa
H R
HR
D000596:Amino Acids / Q000378:metabolism*; D016949:Azospirillum / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D002851:Chromatography, High Pressure Liquid; D003470:Culture Media / Q000737:chemistry; D004269:DNA, Bacterial / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D005030:Ethylenes / Q000378:metabolism; D007210:Indoleacetic Acids / Q000378:metabolism; D009584:Nitrogen / Q000378:metabolism; D010802:Phylogeny; D010937:Plant Growth Regulators / Q000378:metabolism*; D011073:Polyamines / Q000378:metabolism; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics
D000596:Amino Acids; D003470:Culture Media; D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D005030:Ethylenes; D007210:Indoleacetic Acids; D010937:Plant Growth Regulators; D011073:Polyamines; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; C030737:indoleacetic acid; C036216:ethylene; D009584:Nitrogen