Journal Article10.1023/B:MICI.0000023982.76684.9D
The Effect of Tryptophan Present in Plant Root Exudates on the Phytostimulating Activity of Rhizobacteria
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TL;DR: The beneficial effect of bacterial inoculation on the radish plants can be explained by the fact that the introduced rhizobacteria produce the plant growth–stimulating hormone indole-3-acetic acid.
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Abstract: Aseptic tomato and radish roots were found to exude, respectively, 2.8–5.3 and 290–390 ng tryptophan per seedling per day. The inoculation of radish plants with rhizosphere pseudomonads increased the root biomass by 1.4 times. The inoculation of tomato plants with the same pseudomonads was ineffective. The beneficial effect of bacterial inoculation on the radish plants can be explained by the fact that the introduced rhizobacteria produce the plant growth–stimulating hormone indole-3-acetic acid. In pot experiments, the addition of this phytohormone to the soil increased the mass of radish roots by 36%. The phytohormonal action of the rhizosphere microflora was found to be efficient provided that the concentration of tryptophan in the rhizosphere is sufficiently high.
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Plant-growth-promoting rhizobacteria.
TL;DR: This review restricts itself to bacteria that are derived from and exert this effect on the root and generally designated as PGPR (plant-growth-promoting rhizobacteria), which can be direct or indirect in their effects on plant growth.
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Indole-3-acetic acid in microbial and microorganism-plant signaling.
TL;DR: The fact that bacteria use this phytohormone to interact with plants as part of their colonization strategy, including phyto-stimulation and circumvention of basal plant defense mechanisms, is highlighted.
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Involvement of siderophores in the reduction of metal-induced inhibition of auxin synthesis in Streptomyces spp
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Bottlenecks in commercialisation and future prospects of PGPR
Bushra Tabassum,Anwar Khan,Muhammad Tariq,Memoona Ramzan,Muhammad Saleem Iqbal Khan,Naila Shahid,Khadija Aaliya +6 more
TL;DR: Microbial inoculants for the biological control of plant diseases combined with plant growth promoters have great potential for a huge market share worldwide with an annual growth rate of 15%.
227
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TL;DR: In this article, a colorimetric method was used to assess California soils for their potential to produce auxins upon the addition of L-tryptophan (L-TRP).
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