Summary
Culture supernatants ofAzotobacter vinelandii andAzotobacter beijerinckii contain auxins, at least three gibberellin-like substances and three cytokinin-like substances. Treating roots of tomato seedlings with these cultures accelerates plant growth and increases yield of fruit, effects probably caused by activity of the plant hormones. Amounts of hormones produced in these cultures are similar to those produced byAzotobacter chroococcum andAzotobacter paspali.
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Azcón, R., Barea, J.M. Synthesis of auxins, gibberellins and cytokinins byAzotobacter vinelandii andAzotobacter beijerinckii related to effects produced on tomato plants. Plant Soil 43, 609–619 (1975). https://doi.org/10.1007/BF01928522
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DOI: https://doi.org/10.1007/BF01928522