Effect of phytohormones synthesized by rhizosphere bacteria on plants |
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Authors: | M G Sokolova G P Akimova O B Vaishlya |
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Institution: | (1) Laboratory of Growth Regulators, Faculty of Natural Sciences of the Palacký University and Institute of Experimental Botany ASCR, lechtitel 11, 783 71 Olomouc, Czech Republic; |
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Abstract: | New strains of rhizosphere microorganisms Azotobacter chroococcum Az d10, Bacillus megaterium Pl-04, and Bacillus mucilaginosus B-1574 were found to be able to synthesize cytokinins (CKs) and indolylacetic acid (IAA). Three forms of CKs—dihydrozeatin
riboside, isopentenyl adenosine, and trans-zeatin riboside—were identified, whose ratio was different in the three bacterial cultures. Inoculation of cucumber (Cucumis sativus L.) plants increased the content of CKs and IAA in them by 35.6 and 21.3%, respectively, and also stimulated seed germination
and increased the growth rate, the biomass of shoots, the number of lateral roots, and the root hair area, which ensured better
plant nutrition. The IAA/CKs ratio shifted during bacterization towards CKs due to increase in the content of riboside forms,
which apparently caused growth stimulation. |
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