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Browsing University of Hertfordshire by Author "Davies, Keith G."
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The control of root-knot nematodes (Meloidogyne spp.) by Pseudomonas oryzihabitans and its immunological detection on tomato roots
Vagelas, Ioannis K.; Pembroke, Barbara; Gowen, Simon R.; Davies, Keith G. (2007)Pseudomonas oryzihabitans, a bacterium associated with the entomopathogenic nematode Steinernema abbasi, was evaluated for its potential to colonise roots and thereby control a field population of root-knot nematodes. ... -
Cuticle Surface Coat of Plant-Parasitic Nematodes
Davies, Keith G.; Curtis, Rosane H. C. (ANNUAL REVIEWS, 2011)The surface coat (SC) of the plant-parasitic nematode cuticle is an understudied area of current research, even though it likely plays key roles in both nematode-plant and nematode-microbe interactions. Although in several ... -
Exploitation of immunofluorescence for the quantification and characterization of small numbers of Pasteuria endospores
Costa, Sofia R.; Kerry, Brian R.; Bardgett, Richard D.; Davies, Keith G. (2006-12)The Pasteuria group of endospore-forming bacteria has been studied as a biocontrol agent of plant-parasitic nematodes. Techniques have been developed for its detection and quantification in soil samples, and these mainly ... -
Fecundity and lifespan manipulations in Caenorhabditis elegans using exogenous peptides
Davies, Keith G.; Hart, John E. (2008)In this study using Caenorhabditis elegans, we have been able to suppress (> 60%) and enhance (> 40%) fecundity (number of offspring) while extending lifespan by a fifth, by administering synthetic peptides to the aqueous ... -
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 specificity exhibited by populations of endospores of Pasteuria penetrans to the juvenile and male cuticles of Meloidogyne hapla
Davies, Keith G.; Williamson, Valerie M. (2006) -
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. ... -
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 ... -
Re-evaluation of the life-cycle of the nematode-parasitic bacterium Pasteuria penetrans in root-knot nematodes, Meloidogyne spp.
Davies, Keith G.; Rowe, Janet; Manzanilla-Lopez, Rosa; Opperman, Charles H. (2011)Comparisons of the growth of Pasteuria penetrans in adult root-knot nematode females infected with P. penetrans dissected from the roots of tomato plants were undertaken using bright-field and scanning electron microscopy. ... -
Reproduction potentiated in nematodes (Caenorhabditis elegans) and guppy fish (Poecilia reticulata) by adding a synthetic peptide to their aqueous environment
Davies, Keith G.; Zimmerman, Brian; Dudley, Ed; Newton, Russell; Hart, John E. (2015-03-01)Ambient exposure to a short synthetic peptide has enhanced fecundity (number of offspring) in invertebrates and vertebrates, ostensibly by disinhibiting reproduction. In separate experiments nematodes (Caenorhabditis ... -
Understanding the Interaction Between an Obligate Hyperparasitic Bacterium, Pasteuria penetrans and its Obligate Plant-Parasitic Nematode Host, Meloidogyne spp.
Davies, Keith G. (Elsevier, 2009)Pasteuria penetrans is an endospore-forming bacterium, which is a hyperparasite of root-knot nematodes Meloidogyne spp. that are economically important pests of a wide range of crops. The life cycle of the bacterium and ...