Bacillus as PGPR in Crop Ecosystem

Kumar, Ashok; Prakash, Anil; Johri, B. N.

doi:10.1007/978-3-642-18357-7_2

Cited by 188 publications

(136 citation statements)

References 87 publications

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“…3). These bacterial species, with a possibility of enzymatic degradation of starch to fructose and glucose, provide plants with more energy and stimulate root expansion by producing growth regulators that improve absorption of water and nutrients by plants (Kumar et al 2011). A significant increase (44 to 55%) in the bulb number was also caused in P. fluorescens, and B. megaterium, whereas inoculation with BA6 (B. cereus) led to the lowest daughter corms number (Fig.…”

Section: Open-field Container Experimentsmentioning

confidence: 99%

Characterization of Bacteria Isolated from the Saffron (Crocus sativus L.) Rhizosphere

Al-Ahmadi

Mohammadi

Kohabadi

2017

Journal of Horticultural Research

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One purpose of assessing the soil alive and active community is the identification of beneficial bacteria to use them as biological fertilizers, replacing or supplementing synthetic fertilizers. Such biofertilizers are predicted for the sustainability of agricultural production, especially for low input systems such as saffron fields. The aim of this work was to isolate and identify saffron rhizobacteria and to evaluate their possible effects on saffron growth. During 2013/14, some bacteria were isolated from the rhizosphere of the saffron plantations of different age in Gol village, Birjand, Iran. In total, 12 bacteria species were identified based on phenotypic traits and 16S rDNA sequences analysis. The strains were identified as B. subtilis, B. anthracis, B. cereus, B. megaterium, Bacillus sp., Paenibacillus, Pseudomonas fluorescens, P. putida, Escherichia coli, Pectobacterium sp. and Pantoea sp., with the dominant population belonging to the genus Bacillus. In the field study, inoculation of soil with these strains did not affect the leaf dry weight of the cultivated saffron, however, the strains of P. fluorescens increased the leaf area while P. fluorescens, Paenibacillus, Pectobacterium and B. megaterium increased the number of daughter corms and Azotobacter, B. cereus, B. subtilis and B. megaterium increased the corm weight. Our finding revealed that some bacteria present in the soil of perennial saffron plantations have a promising potential for developing as a plant growth promoting rhizobacteria.

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Section: Open-field Container Experimentsmentioning

confidence: 99%

Characterization of Bacteria Isolated from the Saffron (Crocus sativus L.) Rhizosphere

Al-Ahmadi

Mohammadi

Kohabadi

2017

Journal of Horticultural Research

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“…Bacillus is a Gram-positive aerobic organism that can resist environmental stress by forming endospores (Kumar et al, 2011); many strains of Bacillus and Paenibacillus are known to stimulate plant growth. Emmert and Handelsman (1999) highlighted the endospore forming character of Bacillus as important for a potential biocontrol inoculant.…”

Section: Plant Growth Promoting Rhizobacteriamentioning

confidence: 99%

“…This is because the spore can endure heat and desiccation ensuring the formulation will be stable over time. This genus is considered nonrhizosphere competent, unlike Pseudomonas; but given that rhizospheric competency is strain-dependent, some strains of Bacillus may be rhizosphere competent (Kumar et al, 2011). Nasr (2002) revealed that the highest levels of auxin were produced by Bacillus cereus and P. fluorescens, grown on shaker as a batch culture of 8.3 and 4.4 mg/L, respectively.…”

Section: Plant Growth Promoting Rhizobacteriamentioning

confidence: 99%

Plant growth promoting rhizobacteria and their potential for biocontrol of phytopathogens

Ramadan¹,

Abdel-Hafez²,

Hassan³

et al. 2016

Afr. J. Microbiol. Res.

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Growth promotion and disease control by rhizobacteria are complex interrelated processes that involve direct and indirect mechanisms. The mechanisms include synthesis of some metabolites (auxin, cytokinin and gibberellins), induction of 1-aminocyclopropane-1-carboxylate (ACC) deaminase, production of siderophore, antibiotics, hydrogen cyanide hydrogen cyanide (HCN) and volatile compounds. They also include mineral solubilization competition, and induction of systemic resistance. These bacteria are suitable as soil inoculants because they have the potential for rapid and aggressive colonization. This feature alone is characterised as a disease control mechanism, which prevents the invasion of detrimental soil microorganisms onto the root surface. Inoculant-based plant growthpromoting rhizobacteria (PGPR) is applied extensively on agricultural crops to improve plants' growth and simultaneously reduce chemical inputs like fertilizer and pesticide which can cause environmental degradation. The structure of the rhizobacterial community is affected by several factors including plant genotype and is determined by the amount and composition of root exudates. In addition, soil type and fertility are the contributing factors that shape the community. This form of communication can affect plants' growth, nutrient status and also susceptibility to stress and pathogens in the host plant. PGPR inoculants cause diverse beneficial interactions among plants, which leads to sustainable and environment-friendly agriculture. The application of rhizosphere soil of agricultural crops with desirable bacterial populations is considered promising in both laboratory and greenhouse experiment. Further, a clearer understanding of the way PGPRs promote plants' growth can lead to expanded exploitation of these 'biofertilizers' in order to reduce the potential negative environmental effects associated with food and fiber production.

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“…In our study all of the selected bacterial isolates were positive for IAA production (Figure 2a). Another important trait of PGPR is ammonia production that indirectly influences the plant growth (Ajay Kumar, 2011). HCN is secondary metabolite produced by various bacteria, and it acts as antagonist on plant pathogens thus helps promoting plant growth (Karmel Reetha, 2014).…”

Section: Pgpr Traitsmentioning

confidence: 99%

Isolation and Characterization of PGPR from Roots of Ficus religiosa growing on Concrete Walls and its Effect on Plant Growth in Drought Condition

Rodge¹,

Sable²,

Salve³

et al. 2016

Int.J.Curr.Microbiol.App.Sci

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Bacillus as PGPR in Crop Ecosystem

Cited by 188 publications

References 87 publications

Characterization of Bacteria Isolated from the Saffron (Crocus sativus L.) Rhizosphere

Characterization of Bacteria Isolated from the Saffron (Crocus sativus L.) Rhizosphere

Plant growth promoting rhizobacteria and their potential for biocontrol of phytopathogens

Isolation and Characterization of PGPR from Roots of Ficus religiosa growing on Concrete Walls and its Effect on Plant Growth in Drought Condition

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