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Table 3 Nodulation [nodule number (NN) and dry weight (NDW)], plant growth [shoot and root dry weight (SDW, RDW)], N concentration (NC) and total N accumulated in shoots (TNS) of soybean cultivar BRS 245 inoculated or not with Bradyrhizobium japonicum CPAC 15 +B. diazoefficiens CPAC 7 and supplemented or not with genistein (5 μM) or concentrated metabolites (CM) of B. diazoefficiens USDA 110 (BD1) or Rhizobium tropici CIAT 899 (RT1)

From: Biotechnological potential of rhizobial metabolites to enhance the performance of Bradyrhizobium spp. and Azospirillum brasilense inoculants with soybean and maize

Treatment NN NDW SDW RDW NC TNS
  (# pl –1) (mg pl –1) (g pl –1) (g pl –1) (mg N g –1) (mg N pl –1)
Non-inoculated control zero2 zero 0.81 b 0.51 b 6.57 b 5.19 b
Inoculated with Bradyrhizobium 38.0 b 162 a 1.31 a 0.77 a 19.38 a 25.5a
Inoculated + genistein 45.2 a 169 a 1.29 a 0.72 a 21.28 a 28.3 a
Inoculated + CM-BD1 (1 mL L–1)1 45.9 a 180 a 1.43 a 0.84 a 21.57 a 29.3 a
Inoculated + CM-BD1 (0.1 mL L–1) 42.5 a 140 a 1.22 b 0.63 ab 19.07 a 23.7 a
Inoculated + CM-RT1 (1 mL L–1) 33.2 b 138 a 1.23 b 0.66 ab 20.65 a 25.3 a
Inoculated + CM-RT1 (0.1 mL L–1) 32.5 b 128 a 1.14 a 0.61 ab 19.81 a 22.9 a
  1. 1 0.1 and 1.0 mL L–1 correspond to approximately 10–9 and 10–8 M of active compounds, respectively.
  2. 2 Data represent the means of six replicates and when followed by different letters within the same column are significantly different (p ≤ 0.05, Duncan’s test).
  3. Experiment performed in Leonard jars, with sterile substrate and receiving N-free nutrient solution, under greenhouse conditions. Plants were harvested at 45 days after emergence.