## 3 Results
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Strain** & **Origin** & **Taxonomic Identification** & **GenBank Accession** & **IAA 1 ** & **Phosphate** \\  & & & **Number** & **(Intensity Colour (HD)/CD 1 ** & **Solubilisation** \\  & & & **Scale 0-9 ** & **(DCP + HD/CD 1 ** \\ \hline PVB1S1 & tomato shoot, pasture soil & _ Bacillus subtilis_ & KX440184 & 0 & 0.00 & 1.54 \\ PVB1S2 & tomato shoot, pasture soil & Bacillaceae bacterium & KX442613 & 0 & 0.00 & 1.50 \\ PVB1S3 & tomato shoot, pasture soil & _Acinetched traffic_ & KX440393 & 0 & 0.00 & 0.00 \\ PVB1S5 & tomato shoot, pasture soil & _ Bacillus cereus_ & KX440517 & 0 & 0.00 & 0.00 \\ PVB1L1 & tomato leaf, pasture soil & _ Bacillus tharingiensis_ & KX442563 & 0 & 0.00 & 0.00 \\ PVB1L2 & tomato leaf, pasture soil & Bacillaceae mornis_ & KX437755 & 0 & 5.04 & 0.00 \\ PVB1L3 & tomato leaf, pasture soil & Bacillas cereus & KX437576 & 0 & 0.00 & 1.37 \\ PVB1L5 & tomato leaf, pasture soil & Bacillas cereus & KX438058 & 0 & 0.00 & 0.00 \\ PVB1L6 & tomato leaf, pasture soil & Bacillas mapetiaran & KX438317 & 0 & 2.92 & 0.00 \\ PVB1L7 & tomato leaf, pasture soil & Bacillas neutolensis & KX438316 & 0 & 2.92 & 1.96 \\ PVB1S8 & tomato leaf, pasture soil & Bacillas cereus & KX438379 & 0 & 0.00 & 0.00 \\ PVB1R1 & tomato root, pasture soil & Bacillas aerophiles & KX440185 & 0 & 0.00 & 0.00 \\ PVB6R2 & tomato root, pasture soil & Bacillas mornis & KX440975 & 0 & 4.96 & 0.00 \\ PVB6R3 & tomato root, pasture soil & Bacillas thuringiensis & KX4444154 & 0 & 0.00 & 1.42 \\ PVB6R4 & tomato root, pasture soil & Bacillaceae bacterium & KX443572 & 0 & 0.00 & 0.00 \\ PVB6S & tomato root, pasture soil & Bacillas thuringiensis & KX443561 & 0 & 0.00 & 0.00 \\ PVB6L1 & tomato leaf, pasture soil & _Acinetched glutamic glutamic_ & KX440619 & 2 & 0.00 & 0.00 \\ PVB6L2 & tomato leaf, pasture soil & _Acinetched glutamic glutamic_ & KX440956 & 0 & 0.00 & 1.79 \\ PVB6L3 & tomato leaf, pasture soil & _Acinetched glutamic glutamic_ & KX440957 & 1 & 0.00 & 0.00 \\ PVB6L4 & tomato leaf, pasture soil & Bacillas cereus & KX440973 & 0 & 0.00 & 1.55 \\ PVB7R1 & tomato root, pasture soil & Bacillas subtilis & KX442598 & 0 & 1.58 & 2.00 \\ PVB7R2 & tomato root, pasture soil & Bacillas cereus & KX442609 & 0 & 0.00 & 0.00 \\ PVB2R & tomato root, vegetable garden & Panuchillas sp. & KX442611 & 0 & 0.00 & 0.00 \\ PO2L1 & tomato leaf, vegetable garden & Bacillas nicotari & KX437571 & 0 & 0.00 & 0.00 \\ PVOS1 & tomato shoot, vegetable garden & Bacillas thuringiensis & KX442562 & 0 & 0.00 & 0.00 \\ PVOS1 & tomato shoot, vegetable garden & _Kochuria pintensis_ & KX442561 & 0 & 1.83 & 1.61 \\ \hline \hline \end{tabular}
\end{table} 
Table 1: _Cont._Based on the taxonomic identification (possible plant and human pathogens have been excluded) and the results of the physiological activity assay (at least one positive character), two bacterial strains isolated from cucumber (_Herbaspirillum lusitanum_ CVB2R5, _Stenotrophomonas rhizophila_ CVB3S5) and six (_Pseudomonas migulae_ SVB3R2, _P. migulae_ SVB3R3 _P. migulae_ SVB3R4, _Pseudomonas_ sp. SVB3R5, _P. brassicacarum_ SVB6R1, _Pseudomonas_ sp. SL3R6) from sorghum were selected for further analysis. The characterization of the antibiotic resistance profile revealed low levels of antibiotic resistance in the eight strains (Table 2). All bacterial endophytes were resistant to nitrofurans. Besides that, _H. lusitanum_ CVB2R5 was resistant to phosphomycin, _P. brassicacarum_ SVB6R1 to cefixime, and _S. rhizophila_ CVB3S5 to both cefixime and cefoperazone, two third generation cephalospor. In order to assess whether the eight strains were true endophytes, we selected spontaneous rifampicin-resistant mutants from each strain and used them for the re-inoculation test. Both strains isolated from cucumber (_Herbaspirillum lusitanum_ CVB2R5 and _Stenotrophomonas rhizophila_ CVB3S5) were unable to colonize the leaves, the shoot or the root tissues of this plant species. On the other hand, all strains isolated from sorghum, except for _Pseudomonas_ sp.