Bio-efficacy of Geobacillus thermodenitrificans PS41 against larvicidal, fungicidal, and plant growth–promoting activities

Nagarajan, S.; Balagurunathan, Ramasamy; Venkatesan, S.; Hemalatha, N.

doi:10.1007/s11356-022-20455-z

Cited by 5 publications

(5 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It appears to be a widespread bacterium (present at rhizosphere soils and plant roots) that plays a protective role from plant pathogenic infection. Some species of genera Geobacillus and Pasteuria in rhizosphere soils or plant roots show insecticidal or nematicidal activity, such as G. thermoglucosidasius and P. penetrans ( Liu et al, 2019 ; Siddharthan et al, 2022 ). Both genera were not changed at rhizosphere soils but significantly increased in the infected roots, especially genus Pasteuria .…”

Section: Discussionmentioning

confidence: 99%

Microbial landscapes of the rhizosphere soils and roots of Luffa cylindrica plant associated with Meloidogyne incognita

et al. 2023

View full text Add to dashboard Cite

IntroductionThe root-knot nematodes (RKN), especially Meloidogyne spp., are globally emerging harmful animals for many agricultural crops.MethodsTo explore microbial agents for biological control of these nematodes, the microbial communities of the rhizosphere soils and roots of sponge gourd (Luffa cylindrica) infected and non-infected by M. incognita nematodes, were investigated using culture-dependent and -independent methods.ResultsThirty-two culturable bacterial and eight fungal species, along with 10,561 bacterial and 2,427 fungal operational taxonomic units (OTUs), were identified. Nine culturable bacterial species, 955 bacterial and 701 fungal OTUs were shared in both four groups. More culturable bacterial and fungal isolates were detected from the uninfected soils and roots than from the infected soils and roots (except no fungi detected from the uninfected roots), and among all samples, nine bacterial species (Arthrobacter sp., Bacillus sp., Burkholderia ambifaria, Enterobacteriaceae sp., Fictibacillus barbaricus, Microbacterium sp., Micrococcaceae sp., Rhizobiaceae sp., and Serratia sp.) were shared, with Arthrobacter sp. and Bacillus sp. being dominant. Pseudomonas nitroreducens was exclusively present in the infested soils, while Mammaliicoccus sciuri, Microbacterium azadirachtae, and Priestia sp., together with Mucor irregularis, Penicillium sp., P. commune, and Sordariomycetes sp. were found only in the uninfected soils. Cupriavidus metallidurans, Gordonia sp., Streptomyces viridobrunneus, and Terribacillus sp. were only in the uninfected roots while Aspergillus sp. only in infected roots. After M. incognita infestation, 319 bacterial OTUs (such as Chryseobacterium) and 171 fungal OTUs (such as Spizellomyces) were increased in rhizosphere soils, while 181 bacterial OTUs (such as Pasteuria) and 166 fungal OTUs (such as Exophiala) rose their abundance in plant roots. Meanwhile, much more decreased bacterial or fungal OTUs were identified from rhizosphere soils rather than from plant roots, exhibiting the protective effects of host plant on endophytes. Among the detected bacterial isolates, Streptomyces sp. TR27 was discovered to exhibit nematocidal activity, and B. amyloliquefaciens, Bacillus sp. P35, and M. azadirachtae to show repellent potentials for the second stage M. incognita juveniles, which can be used to develop RKN bio-control agents.DiscussionThese findings provided insights into the interactions among root-knot nematodes, host plants, and microorganisms, which will inspire explorations of novel nematicides.

show abstract

Section: Discussionmentioning

confidence: 99%

Microbial landscapes of the rhizosphere soils and roots of Luffa cylindrica plant associated with Meloidogyne incognita

et al. 2023

View full text Add to dashboard Cite

show abstract

“…are well-known plant probiotics [63,64], and Lactobacillus is widely used as an antagonistic bacteria in the field of biological control [65]. In addition, other enriched genera, such as Geobacillus [66], Stenotrophomonas [67], Bifidobacteria [68], Chryseobacterium [68], Aeromonas [69], Comamonas [70], Azomonas [71], Klebsiella [72], Cellulosimicrobium [73], Microbispora [74], Kocuria [75], and Cellulomonas [76], have been reported to have antibacterial properties or host growth promotion effects. Concerning endophytic fungi, there was little difference between healthy and diseased leaves, with only Phoma significantly clustering in diseased leaves.…”

Section: Small Changes In Host Microbiome Composition Predict Disease...mentioning

confidence: 99%

“…This could possibly be a "cry for help" strategy from the microbiota within the host organism in response to the external environment [36]. At this time, the relative abundance of Brevundimonas and Geobacillus rapidly increased, and these two types of bacteria have been previously studied for their role in promoting plant growth and responding to biotic and abiotic stress [61,66,93]. For endophytic fungi, most metabolic pathways were significantly active during phase C, but the ASV of fungi in diseased leaves had exceeded that in healthy leaves since phase B, indicating that endophytic fungi in apple leaves were more sensitive to rust fungus.…”

Section: Endophytes Contend With Gymnosporangium Yamadae Through a Se...mentioning

confidence: 99%

Time-Course Responses of Apple Leaf Endophytes to the Infection of Gymnosporangium yamadae

Li,

Tao,

Liang

2024

JoF

View full text Add to dashboard Cite

Apple rust, caused by Gymnosporangium yamadae, poses a significant challenge to apple production. Prior studies have underscored the pivotal role played by endophytic microbial communities, intimately linked with the host, in influencing plant diseases and their pathogenic outcomes. The objective of this study is to scrutinize alternations in endophytic microbial communities within apple leaves at different stages of apple rust using high-throughput sequencing technology. The findings revealed a discernible pattern characterized by an initial increase and subsequent decrease in the alpha diversity of microbial communities in diseased leaves. A microbial co-occurrence network analysis revealed that the complexity of the bacterial community in diseased leaves diminished initially and then rebounded during the progression of the disease. Additionally, employing the PICRUSt2 platform, this study provided preliminary insights into the functions of microbial communities at specific disease timepoints. During the spermogonial stage, endophytic bacteria particularly exhibited heightened activity in genetic information processing, metabolism, and environmental information processing pathways. Endophytic fungi also significantly enriched a large number of metabolic pathways during the spermogonial stage and aecial stage, exhibiting abnormally active life activities. These findings establish a foundation for comprehending the role of host endophytes in the interaction between pathogens and hosts. Furthermore, they offer valuable insights for the development and exploitation of plant endophytic resources, thereby contributing to enhanced strategies for managing apple rust.

show abstract

“…To maintain a constant agricultural output, chemical pesticides have been applied for a very long time, but the majority of them have a number of negative side effects. Numerous studies have demonstrated that the repeated use of chemical pesticides to control pests has resulted in a number of serious issues, including the development of pest genetic resistance, the loss of natural biocontrol agents, pollinators, environmental pollution, and toxic residues in food, water, air, and soil, all of which have a negative impact on human health and disrupt ecosystems (Jadhav et al, 2016;Siddharthan et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Efficacy of botanicals extracts against Spodoptera litura (Lepidoptera: Noctuidae) under laboratory condition

et al. 2022

View full text Add to dashboard Cite

Numerous cultivated plants are attacked by Spodoptera litura, which also significantly reduces crop yields. In this study, a green strategy was used to assess the toxicological impact of three plant extracts (Eucalyptus globulus, Allium sativum, and Azadirachta indica) against S. litura larvae in their second and third instars. The study resulted that among the tested extracts, neem (A. indica) was found to be the most toxic and efficient extract followed by E. globulus and A. sativum. 29.92, 56.61, and 79.53% mortality of 2nd instar larvae were recorded at 3, 5, and 7 ppm, respectively, while 24.52, 27.66, and 72.42% of 3rd instars. Among the tested extracts, A. sativum was the least toxic extract than others. One of the main causes of large losses in field crops is insect pest damage. According to the study’s findings, A. indica extract has the potential to lessen S. litura damage to crops as a natural substitute for chemical pesticides without harming beneficial species.

show abstract

Bio-efficacy of Geobacillus thermodenitrificans PS41 against larvicidal, fungicidal, and plant growth–promoting activities

Cited by 5 publications

References 42 publications

Microbial landscapes of the rhizosphere soils and roots of Luffa cylindrica plant associated with Meloidogyne incognita

Microbial landscapes of the rhizosphere soils and roots of Luffa cylindrica plant associated with Meloidogyne incognita

Time-Course Responses of Apple Leaf Endophytes to the Infection of Gymnosporangium yamadae

Efficacy of botanicals extracts against Spodoptera litura (Lepidoptera: Noctuidae) under laboratory condition

Contact Info

Product

Resources

About