The Scientific World Journal / 2013 / Article / Tab 3

Research Article

Genotypic Characterization of Azotobacteria Isolated from Argentinean Soils and Plant-Growth-Promoting Traits of Selected Strains with Prospects for Biofertilizer Production

Table 3

Effect of pure IAA solutions and Azotobacter inoculation on the number of seminal roots, and root colonization of 8-day-old wheat seedlings.

TreatmentIAA concentration μg mL−1Number of seminal roots per plantRoot colonization (cfu root−1)

Low-IAA 2
High-IAA 20
A. salinestris AT182.2 4.38 × 104 ± 1.68 × 
A. salinestris AT372.5 6.94 × 105 ± 2.67 × 
A. chroococcum AT2514.8 1.26 × 106 ± 4.67 × 
A. chroococcum AT3114.2 8.41 × 105 ± 1.87 × 
A. salinestris AT1918.2 3.01 × 106 ± 1.12 × 

Pregerminated seeds were treated with water (Control), IAA pure solutions of 2 μg mL−1 (Low-IAA) and 20 μg mL−1 (High-IAA), or were inoculated with A. salinestris strains (AT18, AT19, and AT37) or A. chroococcum strains (AT25 and AT31). Values are means ± standard error of two independent experiments with three replicates ( ). Different letters in a column indicate significant differences between means as determined by the DGC test ( ).

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