Role of Bacillus Species in Alleviating Biotic Stress in Crops

Chausali, Neha; Saxena, Jyoti

doi:10.1007/978-3-030-85465-2_17

Cited by 4 publications

(3 citation statements)

References 122 publications

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“…Recent research indicates the potential of Plant Growth Promoting Microorganisms (PGPMs), also referred to as "biofertilizers", for enhancing nutrient availability, plant disease resistance, and soil moisture availability [45][46][47][48]. PGPMs have shown particular promise in combination with biochar in agricultural applications [49,50].…”

Section: Introductionmentioning

confidence: 99%

Biochar-biofertilizer combinations enhance growth and nutrient uptake in silver maple grown in an urban soil

2023

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Declining tree health status due to pollutant impacts and nutrient imbalance is widespread in urban forests; however, chemical fertilizer use is increasingly avoided to reduce eutrophication impacts. Biochar (pyrolyzed organic waste) has been advocated as an alternative soil amendment, but biochar alone generally reduces plant N availability. The combination of biochar and either organic forms of N or Plant Growth Promoting Microbes (PGPMs) as biofertilizers may address these challenges. We examined the effects of two wood biochar types with Bacillus velezensis and an inactivated yeast (IY) biofertilizer in a three-month factorial greenhouse experiment with Acer saccharinum L. (silver maple) saplings grown in a representative urban soil. All treatments combining biochars with biofertilizers significantly increased sapling growth, with up to a 91% increase in biomass relative to controls. Growth and physiological responses were closely related to nutrient uptake patterns, with nutrient vector analyses indicating that combined biochar and biofertilizer treatments effectively addressed nutrient limitations of both macronutrients (N, P, K, Mg, Ca), and micronutrients (B, Fe, Mn, Mo, Na, S, and Zn). Biochar-biofertilizer treatments also reduced foliar concentrations of Cu, suggesting potential to mitigate toxic metal impacts common in urban forestry. We conclude that selected combinations of biochar and biofertilizers have substantial promise to address common soil limitations to tree performance in urban settings.

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Section: Introductionmentioning

confidence: 99%

Biochar-biofertilizer combinations enhance growth and nutrient uptake in silver maple grown in an urban soil

2023

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“…Bacillus, another identified genus, can inhibit the growth of a large spectra of bacterial species, some of which are pathogenic but most of which play important roles in agriculture and the environment ( Santoyo et al, 2012 ). Several Bacillus species are used as biopesticides to control pathogens and improve agricultural yields ( Chausali and Saxena, 2022 ). In fact, Bacillus has been successfully applied to many crops such as tomato, wheat, soybean, and sunflower ( Aloo et al, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Contribution to the characterization of the seed endophyte microbiome of Argania spinosa across geographical locations in Central Morocco using metagenomic approaches

Sohaib,

Fays,

Khatib

et al. 2024

Front. Microbiol.

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Microbial endophytes are microorganisms that live inside plants, and some of them play important yet understudied roles in plant health, growth, and adaptation to environmental conditions. Their diversity within plants has traditionally been underestimated due to the limitations of culture-dependent techniques. Metagenomic profiling provides a culture-independent approach to characterize entire microbial communities. The argan tree (Argania spinosa) is ecologically and economically important in Morocco, yet its seed endophyte microbiome remains unexplored. This study aimed to compare the bacterial and fungal endophyte communities associated with argan seeds collected from six sites across Morocco using Illumina MiSeq sequencing of the 16S rRNA gene and ITS regions, respectively. Bacterial DNA was extracted from surface-sterilized seeds and amplified using universal primers, while fungal DNA was isolated directly from seeds. Bioinformatics analysis of sequencing data identified taxonomic profiles at the phylum to genus levels. The results indicated that bacterial communities were dominated by the genus Rhodoligotrophos, while fungal communities exhibited varying degrees of dominance between Ascomycota and Basidiomycota depending on site, with Penicillium being the most abundant overall. Distinct site-specific profiles were observed, with Pseudomonas, Bacillus, and Aspergillus present across multiple locations. Alpha diversity indices revealed variation in endophyte richness between seed sources. In conclusion, this first exploration of the argan seed endophyte microbiome demonstrated environmental influence on community structure. While facing limitations due to small sample sizes and lack of ecological metadata, it provides a foundation for future mechanistic investigations into how specific endophyte–host interactions shape argan adaptation across Morocco’s diverse landscapes.

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“…Cereals are directly related to the food source and energy supply and are always fronted with a wide range of biotic stresses that negatively affect their survival and growth [ 1 , 2 ]. These stresses can cause by living organisms such as bacteria, viruses, fungi, nematodes, and pests [ 1 , 3 ]. Among biotic stresses, fungal pathogens play a fundamental role in causing 70 to 80% of cereal diseases [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Integrative systems biology analysis of barley transcriptome ─ hormonal signaling against biotic stress

et al. 2023

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Biotic stresses are pests and pathogens that cause a variety of crop diseases and damages. In response to these agents, crops trigger specific defense signal transduction pathways in which hormones play a central role. To recognize hormonal signaling, we integrated barley transcriptome datasets related to hormonal treatments and biotic stresses. In the meta-analysis of each dataset, 308 hormonal and 1232 biotic DEGs were identified respectively. According to the results, 24 biotic TFs belonging to 15 conserved families and 6 hormonal TFs belonging to 6 conserved families were identified, with the NF-YC, GNAT, and WHIRLY families being the most prevalent. Additionally, gene enrichment and pathway analyses revealed that over-represented cis-acting elements were recognized in response to pathogens and hormones. Based on the co-expression analysis, 6 biotic and 7 hormonal modules were uncovered. Finally, the hub genes of PKT3, PR1, SSI2, LOX2, OPR3, and AOS were candidates for further study in JA- or SA-mediated plant defense. The qPCR confirmed that the expression of these genes was induced from 3 to 6 h following exposure to 100 μM MeJA, with peak expression occurring between 12 h and 24 h and decreasing after 48 h. Overexpression of PR1 was one of the first steps toward SAR. As well as regulating SAR, NPR1 has also been shown to be involved in the activation of ISR by the SSI2. LOX2 catalyzes the first step of JA biosynthesis, PKT3 plays an important role in wound-activated responses, and OPR3 and AOS are involved in JA biosynthesis. In addition, many unknown genes were introduced that can be used by crop biotechnologists to accelerate barley genetic engineering.

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Role of Bacillus Species in Alleviating Biotic Stress in Crops

Cited by 4 publications

References 122 publications

Biochar-biofertilizer combinations enhance growth and nutrient uptake in silver maple grown in an urban soil

Biochar-biofertilizer combinations enhance growth and nutrient uptake in silver maple grown in an urban soil

Contribution to the characterization of the seed endophyte microbiome of Argania spinosa across geographical locations in Central Morocco using metagenomic approaches

Integrative systems biology analysis of barley transcriptome ─ hormonal signaling against biotic stress

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