Abstract
The rhizosphere is the soil–plant root interphase and in practice consists of the soil adhering to the root besides the loose soil surrounding it. Plant growth-promoting rhizobacteria (PGPR) are potential agents for the biological control of plant pathogens. A biocontrol strain should be able to protect the host plant from pathogens and fulfill the requirement for strong colonization. Numerous compounds that are toxic to pathogens, such as HCN, phenazines, pyrrolnitrin, and pyoluteorin as well as, other enzymes, antibiotics, metabolites and phytohormones are the means by which PGPR act, just as quorum sensing and chemotaxis which are vital for rhizosphere competence and colonization. The presence of root exudates has a pronounced effect on the rhizosphere where they serve as an energy source, promoting growth and influencing the root system for the rhizobacteria. In certain instances they have products that inhibit the growth of soil-borne pathogens to the advantage of the plant root. A major source of concern is reproducibility in the field due to the complex interaction between the plant (plant species), microbe and the environment (soil fertility and moisture, day length, light intensity, length of growing season, and temperature). This review listed most of the documented PGPR genera and discussed their exploitation.
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References
Ahmad F, Ahmad I, Khan MS (2008) Screening of free-living rhizospheric bacteria for their multiple plant growth promoting activities. Microbiol Res 163(2):173–181
Ahn TS, Ka JO, Lee GH, Song HG (2007) Microcosm study for revegetation of barren land with wild plants by some plant growth-promoting rhizobacteria. J Microbiol Biotechnol 17(1):52–57
Alexandre G, Greer SE, Zhulin IB (2000) Energy taxis is the dominant behavior in Azospirillum brasilense. J Bacteriol 182(21):6042–6048
Anith KN, Momol MT, Kloepper JW, Marois JJ, Olson SM, Jones JB (2004) Efficacy of plant growth-promoting rhizobacteria, acibenzolar-S-methyl, and soil amendment for integrated management of bacterial wilt on tomato. Plant Dis 88(6):669–673
Anjum MA, Sajjad MR, Akhtar N, Qureshi MA, Iqbal A, Jami AR, Hasan M (2007) Response of cotton to plant growth promoting rhizobacteria (PGPR) inoculation under different levels of nitrogen. J Agric Res 45(2):135
Babalola OO (2010) Ethylene quantification in three rhizobacterial isolates from Striga hermonthica-infested maize and sorghum. Egypt J Biol 12:1–5
Babalola OO, Osir EO, Sanni AI (2002) Characterization of potential ethylene-producing rhizosphere bacteria of Striga-infested maize and sorghum. Afr J Biotechnol 1(2):67–69
Babalola OO, Berner DK, Amusa NA (2007a) Evaluation of some bacterial isolates as germination stimulants of Striga hermonthica. Afr J Agric Res 2(1):27–30
Babalola OO, Sanni AI, Odhiambo GD, Torto B (2007b) Plant growth-promoting rhizobacteria do not pose any deleterious effect on cowpea and detectable amounts of ethylene are produced. World J Microbiol Biotechnol 23(6):747–752
Babalola OO, Kirby BM, Le Roes-Hill M, Cook AE, Cary SC, Burton SG, Cowan DA (2009) Phylogenetic analysis of actinobacterial populations associated with Antarctic Dry Valley mineral soils. Environ Microbiol 11(3):566–576
Baehler E, de Werra P, Wick LY, Pechy-Tarr M, Mathys S, Maurhofer M, Keel C (2006) Two novel MvaT-like global regulators control exoproduct formation and biocontrol activity in root-associated Pseudomonas fluorescens CHAO. Mol Plant Microbe Interact 19(3):313–329
Barriuso J, Solano BR, Fray RG, Camara M, Hartmann A, Manero FJG (2008) Transgenic tomato plants alter quorum sensing in plant growth-promoting rhizobacteria. Plant Biotechnol J 6(5):442–452
Belimov AA, Hontzeas N, Safronova VI, Demchinskaya SV, Piluzza G, Bullitta S, Glick BR (2005) Cadmium-tolerant plant growth-promoting bacteria associated with the roots of Indian mustard (Brassica juncea L. Czern.). Soil Biol Biochem 37(2):241–250
Boyer M, Bally R, Perrotto S, Chaintreuil C, Wisniewski-Dye F (2008) A quorum-quenching approach to identify quorum-sensing-regulated functions in Azospirillum lipoferum. Res Microbiol 159(9–10):699–708
Castro-Sowinski S, Herschkovitz Y, Okon Y, Jurkevitch E (2007) Effects of inoculation with plant growth-promoting rhizobacteria on resident rhizosphere microorganisms. FEMS Microbiol Lett 276:1–11
Chakraborty U, Chakraborty BN, Basnet M, Chakraborty AP (2009) Evaluation of Ochrobactrum anthropi TRS-2 and its talc based formulation for enhancement of growth of tea plants and management of brown root rot disease. J Appl Microbiol 107(2):625–634
Choudhary DK, Johri BN (2009) Interactions of Bacillus spp. and plants—with special reference to induced systemic resistance (ISR). Microbiol Res 164(5):493–513
Duffy B, Keel C, Defago G (2004) Potential role of pathogen signaling in multitrophic plant-microbe interactions involved in disease protection. Appl Environ Microbiol 70(3):1836–1842
Egamberdieva D (2008) Plant growth promoting properties of rhizobacteria isolated from wheat and pea grown in loamy sand soil. Turk J Biol 32(1):9–15
Herschkovitz Y, Lerner A, Davidov Y, Rothballer M, Hartmann A, Okon Y, Jurkevitch E (2005) Inoculation with the plant-growth-promoting rhizobacterium Azospirillum brasilense causes little disturbance in the rhizosphere and rhizoplane of maize (Zea mays). Microb Ecol 50(2):277–288
Hynes RK, Leung GCY, Hirkala DLM, Nelson LM (2008) Isolation, selection, and characterization of beneficial rhizobacteria from pea, lentil, and chickpea grown in western Canada. Can J Microbiol 54(4):248–258
Jha B, Thakur MC, Gontia I, Albrecht V, Stoffels M, Schmid M, Hartmann A (2009) Isolation, partial identification and application of diazotrophic rhizobacteria from traditional Indian rice cultivars. Eur J Soil Biol 45(1):62–72
Kamilova F, Kravchenko LV, Shaposhnikov AI, Azarova T, Makarova N, Lugtenberg B (2006) Organic acids, sugars, and l-tryptophane in exudates of vegetables growing on stone wool and their effects on activities of rhizosphere bacteria. Mol Plant Microbe Interact 19(3):250–256
Kaymak HC, Guvenc I, Yarali F, Donmez MF (2009) The effects of bio-priming with PGPR on germination of radish (Raphanus sativus L.) seeds under saline conditions. Turk J Agric For 33(2):173–179
Kuiper I, Bloemberg GV, Noreen S, Thomas-Oates JE, Lugtenberg BJJ (2001) Increased uptake of putrescine in the rhizosphere inhibits competitive root colonization by Pseudomonas fluorescens strain WCS365. Mol Plant Microbe Interact 14(9):1096–1104
Kumar KV, Srivastava S, Singh N, Behl HM (2009) Role of metal resistant plant growth promoting bacteria in ameliorating fly ash to the growth of Brassica juncea. J Hazard Mater 170(1):51–57
Latha P, Anand T, Rappathi N, Prakasam V, Samiyappan R (2009) Antimicrobial activity of plant extracts and induction of systemic resistance in tomato plants by mixtures of PGPR strains and Zimmu leaf extract against Alternaria solani. Biol Control 50(2):85–93
Lavania M, Chauhan PS, Chauhan SVS, Singh HB, Nautiyal CS (2006) Induction of plant defense enzymes and phenolics by treatment with plant growth-promoting rhizobacteria Serratia marcescens NBRI1213. Curr Microbiol 52(5):363–368
Lopez-Bucio J, Campos-Cuevas JC, Hernandez-Calderon E, Velasquez-Becerra C, Farias-Rodriguez R, Macias-Rodriguez LI, Valencia-Cantero E (2007) Bacillus megaterium rhizobacteria promote growth and alter root-system architecture through an auxin-and ethylene-independent signaling mechanism in Arabidopsis thaliana. Mol Plant Microbe Interact 20(2):207–217
Lugtenberg BJJ, Dekkers L, Bloemberg GV (2001) Molecular determinants of rhizosphere colonization by Pseudomonas. Ann Rev Phytopathol 39:461–490
MacMillan J (2002) Occurrence of gibberellins in vascular plants, fungi, and bacteria. J Plant Growth Regul 20:387–442
Meunchang S, Panichsakpatana S, Weaver RW (2006) Tomato growth in soil amended with sugar mill by-products compost. Plant Soil 280(1–2):171–176
Muleta D, Assefa F, Granhall U (2007) In vitro antagonism of rhizobacteria isolated from Coffea arabica L against emerging fungal coffee pathogens. Eng Life Sci 7(6):577–586
Pirlak L, Kose M (2009) Effects of plant growth promoting rhizobacteria on yield and some fruit properties of strawberry. J Plant Nutr 32(7):1173–1184
Pothier JF, Wisniewski-Dye F, Weiss-Gayet M, Moenne-Loccoz Y, Prigent-Combaret C (2007) Promoter-trap identification of wheat seed extract induced genes in the plant-growth-promoting rhizobacterium Azospirillum brasilense Sp245. Microbiology (UK) 153:3608–3622
Principe A, Alvarez F, Castro MG, Zachi L, Fischer SE, Mori GB, Jofre E (2007) Biocontrol and PGPR features in native strains isolated from saline soils of Argentina. Curr Microbiol 55:314–322
Radwan SS, Dashti N, El-Nemr IM (2005) Enhancing the growth of Vicia faba plants by microbial inoculation to improve their phytoremediation potential for oily desert areas. Int J Phytoremediat 7(1):19–32
Recep K, Fikrettin S, Erkol D, Cafer E (2009) Biological control of the potato dry rot caused by Fusarium species using PGPR strains. Biol Control 50(2):194–198
Riedlinger J, Schrey SD, Tarkka MT, Hampp R, Kapur M, Fiedler HP (2006) Auxofuran, a novel metabolite that stimulates the growth of fly agaric, is produced by the mycorrhiza helper bacterium Streptomyces strain AcH 505. Appl Environ Microbiol 72:3550–3557
Rodrigues EP, Rodrigues LS, de Oliveira ALM, Baldani VLD, Teixeira KRD, Urquiaga S, Reis VM (2008) Azospirillum amazonense inoculation: effects on growth, yield and N2 fixation of rice (Oryza sativa L.). Plant Soil 302(1–2):249–261
Ryu CM, Hu CH, Locy RD, Kloepper JW (2005) Study of mechanisms for plant growth promotion elicited by rhizobacteria in Arabidopsis thaliana. Plant Soil 268(1):285–292
Saleem M, Arshad M, Hussain S, Bhatti AS (2007) Perspective of plant growth promoting rhizobacteria (PGPR) containing ACC deaminase in stress agriculture. J Ind Microbiol Biotechnol 34(10):635–648
Shaharoona B, Bibi R, Arshad M, Zahir ZA, Zia Ul H (2006) 1-Aminocylopropane-1-carboxylate (ACC) deaminase rhizobacteria extenuates ACC-induced classical triple response in etiolated pea seedlings. Pak J Bot 38(5):1491–1499
Shaharoona B, Jamro GM, Zahir ZA, Arshad M, Memon KS (2007) Effectiveness of various Pseudomonas spp. and Burkholderia caryophylli containing ACC-deaminase for improving growth and yield of wheat (Triticum aestivum L). J Microbiol Biotechnol 17(8):1300–1307
Solans M, Vobis G, Wall LG (2009) Saprophytic actinomycetes promote nodulation in Medicago sativa-Sinorhizobium meliloti symbiosis in the presence of high N. J Plant Growth Regul 28(2):106–114
Steindler L, Bertani I, De Sordi L, Schwager S, Eberl L, Venturi V (2009) LasI/R and RhlI/R quorum sensing in a strain of Pseudomonas aeruginosa beneficial to plants. Appl Environ Microbiol 75(15):5131–5140
Urashima Y, Sakai M, Suga Y, Fukunaga A, Hori K (2004) Gravitational water flow enhances the colonization of spinach roots in soil by plant growth-promoting Pseudomonas. Soil Sci Plant Nutr 50(2):277–281
Zahir ZA, Munir A, Asghar HN, Shaharoona B, Arshad M (2008) Effectiveness of rhizobacteria containing ACC deaminase for growth promotion of peas (Pisum sativum) under drought conditions. J Microbiol Biotechnol 18(5):958–963
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Babalola, O.O. Beneficial bacteria of agricultural importance. Biotechnol Lett 32, 1559–1570 (2010). https://doi.org/10.1007/s10529-010-0347-0
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DOI: https://doi.org/10.1007/s10529-010-0347-0