Studies on correlations between soil chemistry and bacterial population in rhizosphere of Bt and non-Bt cotton and characterization of rhizobacteria

Ibrahim, Muhammad; Ahmad, Fiaz; Nawaz, Haq; Aslam, Muhammad; Shad, Muhammad Aslam

doi:10.1080/16583655.2020.1826177

Cited by 4 publications

(3 citation statements)

References 36 publications

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“…The increase in EC with Rw can be attributed to the quantity of negatively charged ions in the soil that interact with soluble salts. Due to the increased acidity, soil EC rose with the BMA when organic acid is released during decomposition (Ibrahim et al, 2020). The chisel ploughing with Rc caused a short-term decrease in soil pH at sowing compared to the cultivator in 2018 and 2019, which persisted until maize harvest.…”

Section: Decomposition Of Total Nitrogen (N Tot )mentioning

confidence: 98%

Quantifying maize phenology using beneficial microorganisms and residue management under deep tillage system

Khan,

Khan

et al. 2023

Zemdirbyste-Agriculture

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Residues differing in quality and incorporation depths are presumed to contribute differently to the improvement of soil properties through decomposition. Understanding the response of residue decomposition at different depths using tillage implements and effective microorganisms can help to develop strategies for improving soil properties. Therefore, three nitrogen (N) supplemented crop residues: wheat (Rw), chickpea (Rc), Rw + Rc, and no residue (R0) as a control, under three different tillage implements: cultivator (CT), mouldboard plough (MBP), and chisel plough (CP), in combination with beneficial microorganisms (BM) applied (BMA) or not applied (BM0, control) were investigated during summer 2018 and 2019. The experiment was conducted in a randomised complete block design (RCBD) with a split plot arrangement with four replications. Tillage implements were placed in the main plots, and crop residues and beneficial microorganisms in subplots. The results of the experiment showed that the use of a MBP increased the availability of mineral nitrogen (N min ) by 23% but decreased the content of soil organic carbon (SOC) (14%) and total nitrogen (N tot ) (7%) compared to the CT. The N min availability was more than doubled with Rc either alone (116%) or in combination with Rw (106%) compared to Ro. Decomposition of crop residues was faster with the BMA, especially with chickpea residues compared to wheat residues or its combination. Structural equation modelling indicated that soil fertility and maize phenology were directly affected by most of soil properties with N min having the highest estimated effect (119.5), followed by electrical conductivity (EC) (0.23), and indirectly by soil pH (0.06). It was concluded that the crop residues improved soil fertility and delayed maize phenology when incorporated through mouldboard or chisel ploughing into deeper soil layers with the BMA. Therefore, the application of chickpea residues is recommended for a faster soil mineralisation and N availability, while wheat residues are recommended in combination with deep tillage for long-term carbon stock development.

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Section: Decomposition Of Total Nitrogen (N Tot )mentioning

confidence: 98%

Quantifying maize phenology using beneficial microorganisms and residue management under deep tillage system

Khan,

Khan

et al. 2023

Zemdirbyste-Agriculture

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“…The deoxyribonucleic acid (DNA) of bacterial isolates producing pink and yellow-colored colonies in Luria-Bertani broth culture was extracted by previously reported method using commercially available DNA extraction kit (Vivantis kit; catalog: GF-BA-100 preps, USA) (Ibrahim et al 2020). The ampli cation of bacterial speci c 16S ribosomal RNA gene was done using universal primer derived from 16S rRNA sequence of Escherichia coli in a thermal cycler polymerase chain reactor (Agilent, Sure Cycler 8800, USA) (Porteous and Armstrong, 1993).…”

Section: Identi Cation Of Bacterial Isolates Based On 16s Rrna Gene S...mentioning

confidence: 99%

“…The ampli cation was carried out using universal primers: forward primer 5'CAGCAGCCGCGGTAATAC3' and reverse primer 5'ACGGGCGGTGTGTACAAG3'. The process of ampli cation was completed following the experimental protocols as reported by Ibrahim et al 2020 (Ibrahim et al 2020).…”

Section: Identi Cation Of Bacterial Isolates Based On 16s Rrna Gene S...mentioning

confidence: 99%

Response-surface optimization of anti-pathogenic activity of metabolic extracts obtained from rhizobacteria of Parthenium hysterophorus

Yousaf

Ibrahim

Nawaz

et al. 2022

Preprint

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The anti-pathogenic activity (APA) of the metabolic extracts obtained from rhizobacteria of Parthenium hysterophorus was optimized by constructing a tri-factorial central composited design in the response surface methodology. The colonies of the rhizobacteria isolated from the rhizospheric soil of P. hysterophorus were identified microscopically. The pink and yellow-colored colonies were cultured at five levels of three culture variables including pH (5, 6, 7, 8, and 9), incubation temperature (IT: 24, 28, 32, 36, and 40°C), and incubation time (It: 24, 48, 72, 96, and 120 h). The bacterial metabolites were extracted in methanol and analyzed for their APA against Pseudomonas aeruginosa and Escherichia coli. A statistically significant linear positive effect of pH was observed on the APA of both of the bacterial extracts and quadratic negative effect on APA of yellow-colored extracts against each of the selected pathogens. The It showed a significant linear positive effect on APA of the pink-colored extract against E. coli and that of the yellow-colored extract against the selected pathogens. It also showed quadratic negative effects on the APA of both of the bacterial extracts against the selected pathogens. However, the IT in the selected range showed no significant effect on the APA of the selected bacterial metabolites against the selected pathogens.

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Physio-biochemical mechanism of melatonin seed priming in stimulating growth and drought tolerance in bread wheat

Shaheen,

Lalarukh,

Ahmad

et al. 2024

BMC Plant Biol

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Drought stress (DS) adversely affects a plant’s development and growth by negatively altering the plant’s physio-biochemical functions. Previous investigations have illustrated that seed priming with growth regulators is an accessible, affordable, and effective practice to elevate a plant’s tolerance to drought stress. Melatonin (MT) is derived from the precursor tryptophan and can improve germination, biomass, and photosynthesis under stress conditions. The current study examined the effect of melatonin seed priming on two wheat cultivars (Fakhar-e-Bhakkar and Akber-19) cultivated under severe drought conditions (35% FC). There were 6 levels of melatonin (i.e., M0 = control, M1 = 1 mg L − 1 , M2 = 2 mg L − 1 , M3 = 3 mg L − 1 , M4 = 4 mg L − 1 and M5 = mg L − 1 ) which were used for seed priming. Our results confirmed that seed priming with M2 = 2 mgL − 1 concentration of MT alleviates the negative effects of DS by boosting the germination rate by 54.84% in Akber-19 and 33.33% in Fakhar-e-Bhakkar. Similarly, leaf-relative water contents were enhanced by 22.38% and 13.28% in Akber-19 and Fakhar-e-Bhakkar, respectively. Melatonin pre-treatment with 2 mgL − 1 significantly enhanced fresh and dry biomass of shoot and root, leaf area, photosynthetic pigments, osmoprotectants accumulation [total soluble proteins (TSP), total free amino acids (TFAA), proline, soluble sugars, glycine betaine (GB)] and lowered the amount of malondialdehyde (MDA) and hydrogen peroxide (H 2 O 2 ) production by elevating antioxidants [Ascorbic acid, catalase (CAT), Phenolics, peroxidase (POD) and superoxide dismutase (SOD)] activity under drought stress (DS). Meanwhile, under control conditions (NoDS), the melatonin treatment M1 = 1 mgL − 1 effectively enhanced all the growth-related physio-biochemical attributes in both wheat cultivars. In the future, more investigations are suggested on different crops under variable agroclimatic conditions to declare 2 mgL − 1 melatonin as an efficacious amendment to alleviate drought stress.

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Studies on correlations between soil chemistry and bacterial population in rhizosphere of Bt and non-Bt cotton and characterization of rhizobacteria

Cited by 4 publications

References 36 publications

Quantifying maize phenology using beneficial microorganisms and residue management under deep tillage system

Quantifying maize phenology using beneficial microorganisms and residue management under deep tillage system

Response-surface optimization of anti-pathogenic activity of metabolic extracts obtained from rhizobacteria of Parthenium hysterophorus

Physio-biochemical mechanism of melatonin seed priming in stimulating growth and drought tolerance in bread wheat

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