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Table 2 Plant growth-promoting traits—siderophore production ability

From: Plant growth-promoting effects of rhizospheric and endophytic bacteria associated with different tomato cultivars and new tomato hybrids

  Strain no. Genotypic characterization OA a IAA a ACC a Sid b - Fe(III) citrate
No 0.25 µM 3 µM
Rhizospheric strains [1] Ensifer sp. + ++ - ++ ++ +/-
[2] Microbacterium sp. + + +/- - - -
[3] Chryseobacterium sp. - + - + + -
[4] Bacillus sp. - - +/- + + +/-
[5] n.p. n.p. ++ ++ n.p. n.p. n.p.
[6] n.p. n.p. ++ ++ n.p. n.p. n.p.
[7] Bacillus sp. +++ - ++ + + +/-
[8] Microbacterium sp. ++ + - - - -
Root endophytes [9] Pseudomonas sp. - + +++ +++ +++ +
[10] n.p. n.p. ++ ++ n.p. n.p. n.p.
[11] Rhizobium sp. +++ ++ ++ +++ +++ ++
[12] Rhodococcus sp. - + ++ +++ +++ +
[13] Agrobacterium sp. +++ +++ ++ +++ +++ ++
[14] Agrobacterium sp. ++ +++ ++ +++ +++ ++
[15] Agrobacterium sp. + +++ ++ +++ +++ ++
[16] Rhizobium sp. +++ +++ + +++ +++ +
[17] Agrobacterium sp. +++ +++ +++ +++ +++ ++
[18] Agrobacterium sp. +++ +++ +++ +++ +++ ++
  1. aPlant growth-promoting (PGP) traits of selected bacterial isolates: ACC deaminase (ACC), organic acids (OA), and Indole acetic acid (IAA) production. n.p. not performed, due to cultivation problems with standard media (LB with standard NaCl concentration and modified, NaCl 0.4 % w/v)
  2. bEvaluation of siderophore (Sid) production ability of selected bacterial isolates. Evaluation of the positivity to the tests, from negative (−) to the highest activity (+++): −, ±, +, ++, +++