Abstract:
In the present study we isolated six bacterial morphotypes from Marrubium vulgare
rhizospheric soil of, two of them (S1 and S4) belong to Streptomyces genus. Their
biochemical characterization has shown that they are Gram positive, unable to degrade
Simmons citrate, possess the catalase enzyme and tolerate up to 75mM of NaCl. They are also
capable of producing auxin (Indole-3-acetic acid) and solubilizing inorganic phosphate. These
two isolates have no effect on tomato seed germination and no inhibitory activity against the
tested microorganisms.
In vivo inoculation effect of tomato plants by the two isolates under salinity constraint (25 and
50mM NaCl) showed, that their growth, relative water content, chlorophyll pigment and
mineral (K and Na) contents are significantly better, their plant tissues are less damaged and
their mortality rate is lower compared to uninoculated plants.
