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Plant growth promoting endophytic bacteria (PGPB) isolated from  Brassica napus  were inoculated in two cultivars of  Helianthus tuberosus  (VR and D19) growing on sand supplemented with 0.1 mM Cd or 1 mM Zn. Plant growth, concentrations of metals and thiobarbituric acid (TBA) reactive compounds were determined. Colonization of roots of  H. tuberosus  D19 by  Pseudomonas  sp. 262 was evaluated using confocal laser scanning microscopy.  Pseudomonas  sp. 228,  Serratia  sp. 246 and  Pseudomonas  sp. 262 significantly enhanced growth of  H. tuberosus  D19 exposed to Cd or Zn.  Pseudomonas  sp. 228 significantly increased Cd concentrations in roots.  Serratia  sp. 246, and  Pseudomonas  sp. 256 and 228 resulted in significantly decreased contents of TBA reactive compounds in roots of Zn exposed D19 plants. Growth improvement and decrease of metal-induced stress were more pronounced in D19 than in VR.  Pseudomonas  sp. 262-green fluorescent protein (GFP) colonized the root epidermis/exodermis and also inside root hairs, indicating that an endophytic interaction was established.  H. tuberosus  D19 inoculated with  Pseudomonas  sp. 228,  Serratia  sp. 246 and  Pseudomonas  sp. 262 holds promise for sustainable biomass production in combination with phytoremediation on Cd and Zn contaminated soils.

Cultivar and Metal-Specific Effects of Endophytic Bacteria in Helianthus tuberosus Exposed to Cd and Zn