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Browsing by Author "Mohan, Sharad"
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Alteration in endospore attachment of H. cajani specific Pasteuria to different age groups of H. cajani J2 exposed to host and non-host root exudates.
Kumar, Kiran; Davies, Keith; Mohan, Sharad (2016-08-28)Plant root exudates and rhizosphere microbes, including nematodes, are involved in highly specific chemical communication that we know little about. Freshly hatched J2 of the pigeon-pea cyst nematode Heterodera cajani and ... -
The Biochemical Diversity of the Second-stage Juvenile Cuticle: It's Origin, Role and Interaction with Pasteuria Endospores
Davies, Keith; Mohan, Sharad; Phani, Victor; Srivastava, Arohi (2024-04-19)Over the last 20 years or so, Caenorhabditis elegans has been used as a model to understand aspects of innate immunity and a number of genes have been identified that play a possible role in microbial infection processes. ... -
Biological Control of Cyst Nematodes through Microbial Pathogens, Endophytes and Antagonists
Davies, Keith; Mohan, Sharad; Hallmann, Johannes (Centre for Agriculture and Bioscience International (CABI), 2018-05-08)This chapter describes the main microbial antagonists of cyst nematodes, their mode of action and how such antagonists can be used in a sustainable manner to suppress cyst nematodes and improve crop yield. -
Characterisation of an endospore population of Pasteuria that adheres to the plant-parasitic nematode Heterodera schachtii
Hirschfield, Ramona; Mohan, Sharad; Davies, Keith (2023-05-04)Selected strains of Pasteuria species from the endospore-forming Gram-positive bacteria group have the potential to be developed into control agents for plant-parasitic nematodes. If Pasteuria is to be deployed successfully ... -
Characterization of the putative antigenic determinants on Pasteuria endospore surface using Bacillus thuringiensis as a comparative tool
Srivastava, Arohi; Mohan, Sharad; Davies, Keith (2016-08-28)Biological control agents are emerging as potential environmentally benign means of combating phytonematodes across the world. Some species of Pasteuria are endospore forming bacterial hyperparasites of nematodes associated ... -
Evidence for diversifying selection of genetic regions of encoding putative collagen-like host-adhesive fibers in Pasteuria penetrans
Srivastava, Arohi; Mohan, Sharad; Mauchline, Tim H.; Davies, Keith (2019-01-01)Pasteuria spp. belong to a group of genetically diverse endospore-forming bacteria (phylum: Firmicutes) that are known to parasitize plant-parasitic nematodes and water fleas (Daphnia spp.). Collagen-like fibres form the ... -
Exploring Bacillus thuringiensis as a model for endospore adhesion and its potential to investigate adhesins in Pasteuria penetrans
Srivastava, Arohi; Mohan, Sharad; Davies, Keith (2022-06-01)Aims: Phytonematodes are a constraint on crop production and have been controlled using nematicides; these are highly toxic and legislation in Europe and elsewhere is prohibiting their use and alternatives are being sought. ... -
Exploring the mechanisms of host-specificity of a hyperparasitic bacterium (Pasteuria spp.) with potential to control tropical root-knot nematodes (Meloidogyne spp.): insights from Caenorhabditis elegans
Davies, Keith; Mohan, Sharad; Phani, Victor; Srivastava, Arohi (2023-12-20)Plant-parasitic nematodes are important economic pests of a range of tropical crops. Strategies for managing these pests have relied on a range of approaches, including crop rotation, the utilization of genetic resistance, ... -
Extrinsic factors governing the spore encumbrance of an indigenous population of Pasteuria hyperparasitizing root-knot nematodes, Meloidogyne species.
Kamra, Anju; Pawar, Swapnil; Davies, Keith; Mohan, Sharad (2016-08-28)Isolates of indigenous populations of gram-positive endospore-forming bacterial hyperparasite Pasteuria spp. infecting root-knot nematodes were made from arid, semi-arid, humid and sub humid ecosystems of India. A semi-arid ... -
Hexapeptides from mammalian inhibitory hormone hunt activate and inactivate nematode reproduction
Hart, John E.; Mohan, Sharad; Davies, Keith G.; Ferneyhough, Ben; Clarke, Iain J.; Hunt, John A.; Shnyder, Steve D.; Mundy, Christopher R.; Howlett, David R.; Newton, Russell P. (2022-12-01)Background: Biopurification has been used to disclose an evolutionarily conserved inhibitory reproductive hormone involved in tissue mass determination. A (rat) bioassay-guided physicochemical fractionation using ovine ... -
Host plant root exudates reduce phytonematode cuticle aging to maintain Pasteuria endospore attachment
Mohan, Sharad; Kumar, Kiran; Davies, Keith (2022-03-17)Endospores of the nematode hyperparasite from the Pasteuria group of Gram-positive bacteria have the potential to suppress phytonematode populations and reduce root infection. Parasitism by the bacteria commences when ... -
Identification of New Single Nucleotide Polymorphism-Based Markers for Inter- and Intraspecies Discrimination of Obligate Bacterial Parasites (Pasteuria spp.) of Invertebrates
Mauchline, Tim H.; Knox, Rachel; Mohan, Sharad; Powers, Stephen J.; Kerry, Brian R.; Davies, Keith G.; Hirsch, Penny R. (2011-09)Protein-encoding and 16S rRNA genes of Pasteuria penetrans populations from a wide range of geographic locations were examined. Most interpopulation single nucleotide polymorphisms (SNPs) were detected in the 16S rRNA gene. ... -
A method for release and multiple strand amplification of small quantities of DNA from endospores of the fastidious bacterium Pasteuria penetrans
Mauchline, Tim H.; Mohan, Sharad; Schaff, J. E.; Opperman, Charles H.; Kerry, Brian R.; Davies, Keith; Hirsch, Penny R. (2010-05)Aims: To establish a reliable protocol to extract DNA from Pasteuria penetrans endospores for use as template in multiple strand amplification, thus providing sufficient material for genetic analyses. To develop a highly ... -
Nematodes as multitrophic organisms: the good, the bad and the unexpected
Davies, Keith; Mohan, Sharad (2021-01-19)Nematodes are cosmopolitan metazoans that occupy all possible ecological niches from the equator to the poles and have even been sent into space. As a group they live a largely unobserved life feeding on fungi and bacteria, ... -
Pasteuria endospores from Heterodera cajani (Nematoda: Heteroderidae) exhibit inverted attachment and altered germination in cross-infection studies with Globodera pallida (Nematoda: Heteroderidae)
Mohan, Sharad; Mauchline, Tim H.; Rowe, Janet; Hirsch, Penny R.; Davies, Keith G. (2012-03)The Pasteuria group of Gram-positive, endospore-forming bacteria are parasites of invertebrates and exhibit differences in host specificity. We describe a cross-infection study between an isolate of Pasteuria from pigeon ... -
Plant root-exudates recruit hyperparasitic bacteria of phytonematodes by altered cuticle aging: implications for biological control strategies
Mohan, Sharad; Kumar, Kieran; Sutar, Vivek; Saha, Supradip; Rowe, Janet; Davies, Keith (2020-06-09)Phytonematodes are globally important functional components of the belowground ecology in both natural and agricultural soils; they are a diverse group of which some species are economically important pests, and environmentally ... -
Understanding nematode suppressive soils: molecular interactions between Pasteuria endospores and the nematode surface coat
Davies, Keith; Srivastava, Arohi; Kumar, Kiran; Mohan, Sharad (Association of Applied Biologists, 2015-09-07)The knowledge that the plant-parasitic nematode hyperparasite Pasteuria penetrans is important in nematode suppressive soils has long been recognised. The ability to mass produce this organism in vitro circumvents one of ...