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Table 1 Production of plant growth regulators (PGRs) by rhizobacteria and crop responses

From: Soil beneficial bacteria and their role in plant growth promotion: a review

PGPR PGRs Crops Responses Reference
Kluyvera ascorbata SUD 165 Siderophores, indole-3-acetic acid Canola, tomato Both strains decreased some plant growth inhibition by heavy metals (nickel, lead, zinc) Burd et al. (2000)
Rhizobium leguminosarum Indole-3-acetic acid Rice Inoculation with R. leguminosarum had significant growth promoting effects on rice seedlings. Biswas et al. (2000)
Rhizobium leguminosarum Indole-3-acetic acid Rice Growth promoting effects upon inoculation on axenically grown rice seedlings were observed Dazzo et al. (2000)
Azotobacter sp. Indole-3-acetic acid Maize Inoculation with strain efficient in IAA production had significant growth promoting effects on maize seedlings. Zahir et al. (2000)
Rhizobacterial isolates Auxins Wheat, rice Inoculation with rhizobacterial isolates had significant growth promoting effects on wheat and rice Khalid et al. (2001)
Rhizobacteria (unidentified) Indole-3-acetic acid Brassica Significant correlation between auxin production by PGPR in vitro and growth promotion of inoculated rapeseed seedlings in the modified jar experiments were observed Asghar et al. (2002)
Rhizobacteria (unidentified) Indole-3-acetic acid Wheat, rice Rhizobacterial strains active in IAA production had relatively more positive effects on inoculated seedlings. Khalid et al. (2001)
Pseudomonas fluorescens Siderophores, indole-3-acetic acid Groundnut Involvement of ACC deaminase and siderophore production promoted nodulation and yield of groundnut Dey et al. (2004)
Rhizobacteria (Unidentified) Auxin, indole-3-acetic acid, acetamide Wheat Strain produced highest amount of auxin in non-sterilized soil and caused maximum increase in growth yield Khalid et al. (2003, 2004)
Azospirillum brasilense A3, A4, A7, A10, CDJA Indole-3-acetic acid, Rice All the bacterial strains increased rice grain yield over uninoculated control Thakuria et al. (2004)
Bacillus circulans P2, Bacillus sp.
P3,Bacillus magaterium P5, Bacillus. Sp. Psd7
Streptomyces anthocysnicus
Pseudomonas aeruginosa Psd5
Pseudomonas pieketti Psd6, Pseudomonas fluorescens
Azospirillum lipoferum strains 15   Wheat Promoted development of wheat root system even under crude oil contamination in pot experiment in growth chamber Muratova et al. (2005)
Pseudomonas denitrificans Auxin Wheat, maize All the bacterial strains had been found to increase plant growth of wheat and maize in pot experiments Egamberdiyeva (2005)
Pseudomonas rathonis
Azotobacter sp. Indole-3-acetic acid Sesbenia, mung bean Increasing the concentration of tryptophane from 1 mg ml-1 to 5 mg ml-1 resulted in decreased growth in both crops Ahmad et al. (2005)
Pseudomonas sp.
Pseudomonas sp. Indole-3-acetic acid Wheat A combined bio-inoculation of diacetyl-phloreglucinol producing PGPR and AMF and improved the nutritional quality of wheat grain Roesti et al. (2006)
Bacillus cereus RC 18, Indole-3-acetic acid Wheat, spinach All bacterial strains were efficient in indole acetic acid (IAA) production and significantly increased growth of wheat and spinach Çakmakçi et al. (2007b)
Bacillus licheniformis RC08,
Bacillus megaterium RC07,
Bacillus subtilis RC11, Bacillus. OSU-142,
Bacillus M-13,
Pseudomonas putida RC06,
Paenibacillus polymyxa RC05 and RC14
Mesorhizobium loti MP6, Chrom-azurol, siderophore (CAS), hydrocyanic acid (HCN), indole-3-acetic acid Brassica Mesorhizobium loti MP6-coated seeds enhanced seed germination, early vegetative growth and grain yield as compared to control Chandra et al. (2007)
Pseudomonas tolaasii ACC23, Siderophores, iIndole-3-acetic acid Brassica PGPR strains protect canola plant against the inhibitory effects of cadmium Dell’Amico et al. (2008)
Pseudomonas fluorescens ACC9,
Alcaligenes sp. ZN4,
Mycobacterium sp. ACC14,
Bacillus sp. Indole-3-acetic acid Rice The isolate SVPR 30, i.e. strain of Bacillus sp., proved to be efficient in promoting a significant increase in the root and shoot parts of rice plants Beneduzi et al. (2008)
Paenibacillus sp.
Streptomyces acidiscabies E13 Hydroxamate siderophores Cowpea S. acidiscabies promoted cowpea growth under nickel stress Dimkpa et al. (2008)