Plant Disease Management by Bioactive Natural Products

Singh, Simranjeet; Kumar, Vijay; Datta, Shivika; Dhanjal, Daljeet Singh

doi:10.1007/978-981-15-3024-1_2

Cited by 17 publications

(13 citation statements)

References 127 publications

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“…japonicum (Figure B) were 1.1 × 10 8 by the end of the year of storage. This is in agreement with similar studies and confirms that the developed formulation, containing nitrogen assimilating bacteria, allows for stable preservation during long-term storage and creates an opportunity for application in agriculture. , To date, other studies have reported that Azospirillum lipoferum and Bacillus subtilis, for example, remained viable after respective 1 and 3 years of storage, but only when stabilized in alginate matrix that limited mechanical stress and mortality in comparison to conventional liquid formulations. , Two formulations in our study, containing α-proteobacterial N 2 -fixing symbiont of legume R. leguminosarium, and a mixture of A.…”

Section: Resultsmentioning

confidence: 99%

Assessment of Long-Term Stability of Encapsulated Agricultural Biologicals in Lipid-Coated Alginate Beads

Kucharzyk

Fulwider

Duong

et al. 2023

ACS Agric. Sci. Technol.

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Recent shift in preference of biological products over chemical seed treatments has resulted in an increased requirement for development of formulations to improve viability and consistency of microbial inoculants. Two of the biggest challenges in introducing biological products to the agriculture industry are stability of formulations and compatibility with common agriculture chemicals. In this study, multiple alginate encapsulation formulations were examined to not only increase shelf stability of microbes but also to improve their protection from various environmental factors. The initial alginate formulation extended stability of sensitive organisms to one year for both on shelf and on seed. The addition of a hydrophobic coating to the formulation protected cells from agriculture chemicals permitting at least three months of survival on shelf and on seed, with little to no viability loss after chemical exposure, in comparison to free microbials. This improved formulation is scalable for field application and provides a new platform for increased viability of agriculturally relevant microorganisms.

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Section: Resultsmentioning

confidence: 99%

Assessment of Long-Term Stability of Encapsulated Agricultural Biologicals in Lipid-Coated Alginate Beads

Kucharzyk

Fulwider

Duong

et al. 2023

ACS Agric. Sci. Technol.

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“…The identification of natural compounds as biological control agents against plant diseases has been largely limited to those exhibiting anti-microbial activity to eradicate pathogens or to those enhancing plant resistance by restricting pathogen growth at infection sites ( Singh and Yadav, 2020 ). However, the use of bactericidal treatment leads to the emergence of chemical-resistant pathogens ( Silva et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

Resveratrol Oligomers, Plant-Produced Natural Products With Anti-virulence and Plant Immune-Priming Roles

et al. 2022

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Antibiotic resistance has become increasingly prevalent in the environment. Many alternative strategies have been proposed for the treatment and prevention of diverse diseases in agriculture. Among them, the modulation of bacterial virulence to bypass antibiotic resistance or boost plant innate immunity can be considered a promising drug target. Plant-produced natural products offer a broad spectrum of stereochemistry and a wide range of pharmacophores, providing a great diversity of biological activities. Here, we present a perspective on the putative role of plant-produced resveratrol oligomers as anti-virulence and plant-immune priming agents for efficient disease management. Resveratrol oligomers can decrease (1) bacterial motility directly and (2) indirectly by attenuating the bacterial type III secretion system (TT3S). They induce enhanced local immune responses mediated by two-layered plant innate immunity, demonstrating (3) a putative plant immune priming role.

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“…Many researchers have explained how the bioactive natural substances found in plants and algae work. The antifungal action of such extracts can be ascribed to cell wall attack and hyphal cytoplasmic contraction, and ultimately to mycelial death [65]. Such modifications are triggered by the interference of macroalgae extract components with enzymatic reactions of wall synthesis that affect fungal morphogenesis and growth.…”

Section: Discussionmentioning

confidence: 99%

In Vitro and In Vivo Biocontrol of Tomato Fusarium Wilt by Extracts from Brown, Red, and Green Macroalgae

et al. 2022

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Fusarium wilt caused by Fusarium oxysporum f. sp. lycopersici (FOL) in tomatoes is globally recognized as one of the most significant tomato diseases, both in fields and in greenhouses. Macroalgae contain a diversity of bioactive complexes. This research was carried out to assess the value of the extracts from three macroalgae (Sargassum dentifolium belongs to Phaeophyta, Gracilaria compressa belongs to Rhodophyta, and Ulva lactuca belongs to Chlorophyta) against wilt disease in tomato plants. The fungal pathogen was isolated from diseased tomato plants growing in several parts of Saudi Arabia. Isolates of the pathogen were identified by morphological and molecular methods. Three organic solvents, in addition to water, were used for extraction to assess the effect of reducing FOL hyphal growth on potato dextrose agar (PDA). Radial reductions in pathogen hyphal growth were seen with all of the solvent and water extracts, but the three macroalgae methanol extracts that were tested showed the greatest reduction in pathogen hyphal growth. The total phenol content of the S. dentifolium extract was higher than that of the other two macroalgae. The phenolic compounds showed variability in all of the extracts that were identified and calculated by high-performance liquid chromatography (HPLC). Phloroglucinol (7.34 mg/g dry weight), vanillic acid (7.28 mg/g dry weight), and gallic acid (6.89 mg/g dry weight) were the phenolic compounds with the highest concentrations in the S. dentifolium, G. compressa, and U. lactuca extracts, respectively. The mycelium of FOL treated with a crude macroalgae extract of tested at 100 µg/mL was examined with a scanning electron microscope. The results showed an obvious difference between the extract-treated and untreated hyphae. The extract-treated hyphae collapsed and bruised, as well as; empty and dead. In the greenhouse experiment, S. dentifolium powder was used to evaluate its effect on disease decline. It led to a decrease in disease severity of 40.8%. The highest total yield (560.8 g) was obtained from the plants treated with S. dentifolium powder. We recommend the use of macroalgae extracts to combat fungal phytopathogens. Because chemical fungicides are extremely toxic to humans and the environment, macroalgae extracts are a good alternative that can be widely and safely used in the field.

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Plant Disease Management by Bioactive Natural Products

Cited by 17 publications

References 127 publications

Assessment of Long-Term Stability of Encapsulated Agricultural Biologicals in Lipid-Coated Alginate Beads

Assessment of Long-Term Stability of Encapsulated Agricultural Biologicals in Lipid-Coated Alginate Beads

Resveratrol Oligomers, Plant-Produced Natural Products With Anti-virulence and Plant Immune-Priming Roles

In Vitro and In Vivo Biocontrol of Tomato Fusarium Wilt by Extracts from Brown, Red, and Green Macroalgae

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