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 | |
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 | ||||
MTCC103, | ||||
Azospirillum lipoferum strains 15 | Â | 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) |