Relative efficiency of rhizobacteria for auxin biosynthesis in rhizosphere and non-rhizosphere soils

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Auxin and plant-microbe interactions. (2011, background): “It is even assumed that over 80% of the bacteria isolated from the rhizosphere are capable to synthesize IAA (Patten and Glick 1996; Khalid et al. 2004).”
L-Tryptophan-dependent biosynthesis of indole-3-acetic acid (IAA) improves plant growth and colonization of maize by Burkholderia phytofirmans PsJN (2014, unknown): “Exogenous application of L-TRP to soils has also been shown to stimulate synthesis of auxins, positively influencing plant growth and development (Khalid et al. 2004b; Zahir et al. 2010a, b).”
Indole-3-acetic acid in microbial and microorganism-plant signaling. (2007, background): “Genome-wide screening for key genes in IAA biosynthesis It has been suggested that 80% of rhizosphere bacteria produce IAA (Patten & Glick, 1996; Khalid et al., 2004).”
Plant growth-promoting bacteria as inoculants in agricultural soils (2015, result): “Other studies have shown that rhizosphere bacteria produce more ICs than bulk soil bacteria (Khalid et al., 2004), and in a recent study Costa et al. (2014) showed that this effect was also observed in endophytic bacteria, demonstrating high IC production in the Enterobacteriaceae family…”
Use of Plant Growth-Promoting Rhizobacteria in Maize and Sugarcane: Characteristics and Applications (2020, background): “(2009) such as auxins (Khalid et al., 2004b); siderophores (Yu et al.”