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Effect of inoculation of salt-stressed cotton seedlings with IAA-producing Pseudomonas putida R4 and P. chlororaphis R5 strains and IAA concentrations (0.1, 0.01, 0.001 μM) on seedling fresh weight. Seedlings were grown for 3 weeks in gnotobiotic sand containing 0 and 100 mM NaCl (A) or 100 mM Mg2SO4 (B). Columns represent means for six seedlings (N = 6) with error bars showing standard error. Columns marked with an asterisk differed significantly from untreated plants at P < 0.05.
