Efficiency of plant growth promoting bacteria for growth and yield enhancement of maize (Zea mays) isolated from rock phosphate reserve area Hazara Khyber Pakhtunkhwa, Pakistan

Pyroligneous acid (PA) is often used in agriculture as a plant growth and yield enhancer. However, the influence of PA application on soil microorganisms is not often studied. Therefore, in this study, we investigated the effect of PA (0.01–5% w/w in soil) on the microbial diversity in two different soils. At the end of eight weeks of incubation, soil microbial community dynamics were determined by Illumina-MiSeq sequencing of 16S rRNA gene amplicons. The microbial composition differed between the lower (0.01% and 0.1%) and the higher (1% and 5%) concentration in both PA spiked soils. The lower concentration of PA resulted in higher microbial diversity and dehydrogenase activity (DHA) compared to the un-spiked control and the soil spiked with high PA concentrations. Interestingly, PA-induced plant growth-promoting bacterial (PGPB) genera include Bradyrhizobium, Azospirillum, Pseudomonas, Mesorhizobium, Rhizobium, Herbaspiriluum, Acetobacter, Beijerinckia, and Nitrosomonas at lower concentrations. Additionally, the PICRUSt functional analysis revealed the predominance of metabolism as the functional module’s primary component in both soils spiked with 0.01% and 0.1% PA. Overall, the results elucidated that PA application in soil at lower concentrations promoted soil DHA and microbial enrichment, particularly the PGPB genera, and thus have great implications for improving soil health.

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Enhancement of Plant Growth and Yield of Wheat (Triticum aestivum L.) under Drought Conditions Using Plant-growth-promoting Bacteria

Annual Research & Review in Biology ◽

10.9734/arrb/2018/44181 ◽

2018 ◽

Vol 28 (6) ◽

pp. 1-18 ◽

Cited By ~ 3

Author(s):

Alaa El-Dein Omara ◽

Mohssen Elbagory

Keyword(s):

Triticum Aestivum ◽

Plant Growth ◽

Triticum Aestivum L ◽

Growth And Yield ◽

Plant Growth Promoting Bacteria ◽

Drought Conditions ◽

Plant Growth Promoting ◽

Growth Promoting

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Effects of plant-growth-promoting bacteria on growth and yield of pepper under limited nitrogen supply

Canadian Journal of Plant Science ◽

10.4141/cjps08116 ◽

2009 ◽

Vol 89 (2) ◽

pp. 349-358 ◽

Cited By ~ 6

Author(s):

F. M. Del Amor ◽

I. Porras

Keyword(s):

Plant Growth ◽

Capsicum Annuum ◽

Growth And Yield ◽

Plant Growth Promoting Bacteria ◽

Total N ◽

Capsicum Annuum L ◽

N Supply ◽

Fluorescence Maximum ◽

Plant Growth Promoting ◽

Growth Promoting

The influence of plant-growth-promoting bacteria (Azospirillum brasilense and Pantoea dispersa) on sweet pepper plants (Capsicum annuum L.) under limited N supply was studied. Inoculation did not affect leaf CO2 assimilation, Ci/Ca (the ratio of the intercellular to the ambient CO2 concentration), concentration of chlorophylls, chlorophyll fluorescence (maximum quantum efficiency of PSII) or SPAD readings. Total plant dry weight was significantly reduced in both inoculated and non-inoculated plants when the N supply was reduced from 12 (control) to 7 mM, whilst the NO3− and total-N concentrations in the leaves were not significantly affected by inoculation. Inoculation did not affect marketable fruit yield or the pigments (chlorophylls, lycopene and β-carotene) and carbohydrate (sucrose, glucose and fructose) contents in the fruits but flavonoids and anthocyanins were increased significantly by the addition of the bacteria, relative to non-inoculated plants under limited N supply. Key words: Plant-growth-promoting bacteria, Capsicum annuum L., soilless, photosynthesis, chlorophylls, flavonoids

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Comparative Effects of Bio-Wastes in Combination with Plant Growth-Promoting Bacteria on Growth and Productivity of Okra

Agronomy ◽

10.3390/agronomy11102065 ◽

2021 ◽

Vol 11 (10) ◽

pp. 2065

Author(s):

Hammad Anwar ◽

Xiukang Wang ◽

Azhar Hussain ◽

Muhammad Rafay ◽

Maqshoof Ahmad ◽

...

Keyword(s):

Plant Growth ◽

Soil Health ◽

Organic Amendments ◽

Plant Growth Promoting Rhizobacteria ◽

Fruit Weight ◽

Growth And Yield ◽

Plant Growth Promoting Bacteria ◽

Randomized Design ◽

Plant Growth Promoting ◽

Growth Promoting

Plant growth-promoting rhizobacteria with multiple growth-promoting traits play a significant role in soil to improve soil health, crop growth and yield. Recent research studies have focused on the integration of organic amendments with plant growth-promoting rhizobacteria (PGPR) to enhance soil fertility and reduce the hazardous effects of chemical fertilizers. This study aims to evaluate the integrated application of biochar, compost, fruit and vegetable waste, and Bacillus subtilis (SMBL 1) to soil in sole application and in combined form. The study comprises eight treatments—four treatments without inoculation and four treatments with SMBL 1 inoculation in a completely randomized design (CRD), under factorial settings with four replications. The results indicate that the integrated treatments significantly improved okra growth and yield compared with sole applications. The integration of SMBL 1 with biochar showed significant improvements in plant height, root length, leaf chlorophyll a and b, leaf relative water content, fruit weight, diameter and length by 29, 29, 50, 53.3, 4.3, 44.7 and 40.4%, respectively, compared with control. Similarly, fruit N, P and K contents were improved by 33, 52.7 and 25.6% and Fe and Zn in shoot were 37.1 and 35.6%, respectively, compared with control. The results of this study reveal that the integration of SMBL 1 with organic amendments is an effective approach to the sustainable production of okra.

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Phosphorus Nutrition and Growth of Cotton Plants Inoculated With Growth-Promoting Bacteria Under Low Phosphate Availability

Frontiers in Sustainable Food Systems ◽

10.3389/fsufs.2020.618425 ◽

2021 ◽

Vol 4 ◽

Cited By ~ 1

Author(s):

Felipe Romero-Perdomo ◽

Isidro Beltrán ◽

Jonathan Mendoza-Labrador ◽

German Estrada-Bonilla ◽

Ruth Bonilla

Keyword(s):

Plant Growth ◽

Rock Phosphate ◽

Growth Promotion ◽

Plant Growth Promoting Bacteria ◽

P Availability ◽

Indole Compounds ◽

P Content ◽

Cotton Plants ◽

Plant Growth Promoting ◽

Growth Promoting

The low availability of phosphorus (P) in the soil drastically limits the world productivity of crops such as cotton. In order to contribute sustainably to the solution of this problem, the current study aimed to evaluate the capacity of phosphate-solubilising bacteria to improve plant growth and its relationship with physiological parameters, as well as the shoot P content in cotton plants in a soil with low P availability amended with rock phosphate. The results showed that, of the six plant growth-promoting bacteria strains evaluated under greenhouse conditions, the Rhizobium strain B02 significantly promoted growth, shoot P content and photosynthetic rate. This strain also improved the transpiration rate and the relative content of chlorophyll but without significant differences. Remarkably, Rhizobium sp. B02 had a more significant effect on plant growth compared to the P nutrition. Furthermore, the effect of its inoculation was more pronounced on the roots' growth compared to the shoot. Finally, application of Rhizobium strain B02 showed the capacity to optimize the use of low-solubility fertilizer as the rock phosphate. These findings could be associated with the metabolic activities of plant growth promotion exhibited by phosphate-solubilising strains, such as phosphate solubilisation, production of indole compounds and siderophores synthesis. In conclusion, this research provides evidence of the biotechnological potential of the Rhizobium genus as phosphate-solubilising bacteria with multiple plant growth-promoting activities capable of improving the plant growth and phosphate nutrition of non-leguminous crops such as cotton in soil with low P availability amended with rock phosphate.

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