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Table 6 Pearson correlation coefficients (r) between maize plants’ growth parameters in the control conditions and the growth of bacteria under stresses conditions

From: Maize growth response to different Bacillus strains isolated from a salt-marshland area under salinity stress

Plant growth parameters Bacterial growth
Control condition Shoot DW (mg) Root DW (mg) Whole weight (mg/plant) Shoot length (cm) Root length (cm) Whole length (cm) Normal condition Salt stress Drought stress Cold stress Heat stress pH
Shoot DW (mg) 1            
Root DW (mg) 0.391* 1           
Whole weight (mg/plant) 0.587** 0.975** 1          
Shoot length 0.563** 0.346 ns 0.441* 1         
Root length 0.418* 0.301 ns 0.366 ns 0.689** 1        
Whole length 0.559** 0.356 ns 0.449* 0.978** 0.826** 1       
Normal condition 0.066 ns 0.135 ns 0.135 ns 0.328 ns −0.026 ns 0.264 ns `1      
Salt stress −0.001 ns −0.012 ns −0.011 ns 0.140 ns −0.224 ns 0.055 ns 0.813** 1     
Drought stress −0.018 ns 0.210 ns 0.180 ns 0.216 ns 0.001 ns 0.178 ns 0.885** 0.684** 1    
Cold stress 0.263 ns 0.077 ns 0.131 ns 0.289 ns 0.166 ns 0.284 ns 0.581** 0.524** 0.491* 1   
Heat stress −0.196 ns −0.084 ns −0.122 ns −0.006 ns −0.005 ns −0.007 ns 0.144 ns 0.029 ns −0.014 ns −0.287 ns 1  
pH −0.273 ns −0.046 ns −0.107 ns 0.006 ns −0.096 ns −0.021 ns 0.297 ns 0.208 ns 0.265 ns −0.208 ns 0.754** 1
  1. **r: Significantly different at P < 0.01; *r: Significantly different at P < 0.05; ns Not significantly different (P > 0.05)