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Biofilm formation and cellulose expression among diverse environmental Pseudomonas isolates (2006)
Journal Article
Ude, S., Arnold, D. L., Moon, C. D., Timms-Wilson, T., & Spiers, A. J. (2006). Biofilm formation and cellulose expression among diverse environmental Pseudomonas isolates. Environmental Microbiology, 8(11), 1997-2011. https://doi.org/10.1111/j.1462-2920.2006.01080.x

The ability to form biofilms is seen as an increasingly important colonization strategy among both pathogenic and environmental bacteria. A survey of 185 plant-associated, phytopathogenic, soil and river Pseudomonas isolates resulted in 76% producing... Read More about Biofilm formation and cellulose expression among diverse environmental Pseudomonas isolates.

Exposure to host resistance mechanisms drives evolution of bacterial virulence in plants (2005)
Journal Article
Pitman, A. R., Jackson, R. W., Mansfield, J. W., Kaitell, V., Thwaites, R., & Arnold, D. L. (2005). Exposure to host resistance mechanisms drives evolution of bacterial virulence in plants. Current Biology, 15(24), 2230-2235. https://doi.org/10.1016/j.cub.2005.10.074

Bacterial pathogenicity to plants and animals has evolved through an arms race of attack and defense. Key players are bacterial effector proteins, which are delivered through the type III secretion system and suppress basal defenses [1]. In plants, v... Read More about Exposure to host resistance mechanisms drives evolution of bacterial virulence in plants.

Molecular characterization of avrPphD, a widely-distributed gene from Pseudomonas syringae pv. phaseolicola involved in non-host recognition by pea (Pisum sativum) (2001)
Journal Article
Vivian, A., Taylor, J. D., Mansfield, J. W., Jackson, R. W., Arnold, D. L., Arnold, D. L., …Vivian, A. (2001). Molecular characterization of avrPphD, a widely-distributed gene from Pseudomonas syringae pv. phaseolicola involved in non-host recognition by pea (Pisum sativum). Physiological and Molecular Plant Pathology, 58(2), 55-62. https://doi.org/10.1006/pmpp.2000.0315

A genomic library clone, pPPY40, from Pseudomonas syringae pv. phaseolicola was previously shown to consist of two regions: region I potentially encoded an avirulence gene involved in non-host recognition in pea and region II contained a replicase ge... Read More about Molecular characterization of avrPphD, a widely-distributed gene from Pseudomonas syringae pv. phaseolicola involved in non-host recognition by pea (Pisum sativum).

Excision from tRNA genes of a large chromosomal region, carrying avrPphB, associated with race change in the bean pathogen, Pseudomonas syringae pv. phaseolicola (2000)
Journal Article
Murillo, J., Jackson, R. W., Mansfield, J. W., Arnold, D. L., Sesma, A., Paynter, C. D., …Vivian, A. (2000). Excision from tRNA genes of a large chromosomal region, carrying avrPphB, associated with race change in the bean pathogen, Pseudomonas syringae pv. phaseolicola. Molecular Microbiology, 38(2), 186-197. https://doi.org/10.1046/j.1365-2958.2000.02133.x

Pseudomonas syringae pv. phaseolicola (Pph) race 4 strain 1302A carries avirulence gene avrPphB. Strain RJ3, a sectoral variant from a 1302A culture, exhibited an extended host range in cultivars of bean and soybean resulting from the absence of avrP... Read More about Excision from tRNA genes of a large chromosomal region, carrying avrPphB, associated with race change in the bean pathogen, Pseudomonas syringae pv. phaseolicola.

A dispensable region of the chromosome which is associated with an avirulence gene in Pseudomonas syringae pv. pisi (1999)
Journal Article
Vivian, A., Jackson, R. W., Arnold, D. L., Arnold, D. L., Brown, J., Jackson, R. W., & Vivian, A. (1999). A dispensable region of the chromosome which is associated with an avirulence gene in Pseudomonas syringae pv. pisi. Microbiology, 145(1), 135-141. https://doi.org/10.1099/13500872-145-1-135

Pseudomonas syringae pv. pisi comprises a number of races which fall into two phylogenetically distinct groups (designated I and II). Races are based on cultivar specificity in the host plant, pea (Pisum sativum), and are specified by the presence of... Read More about A dispensable region of the chromosome which is associated with an avirulence gene in Pseudomonas syringae pv. pisi.

Specific oligonucleotide primers for the identification of Pseudomonas syringae pv. pisi yield one of two possible DNA fragments by PCR amplification: evidence for phylogenetic divergence (1996)
Journal Article
Vivian, A., Taylor, J. D., Arnold, D. L., Arnold, D. L., Athey-Pollard, A., Gibbon, M. J., …Vivian, A. (1996). Specific oligonucleotide primers for the identification of Pseudomonas syringae pv. pisi yield one of two possible DNA fragments by PCR amplification: evidence for phylogenetic divergence. Physiological and Molecular Plant Pathology, 49(4), 233-245. https://doi.org/10.1006/pmpp.1996.0051

Two unique DNA fragments, generated by RAPD-PCR, were used as probes against dot-blots of representative isolates of the seven races of pseudomonas syringae pv. pisi. DNA from each isolate hybridized only to one of the two probes. Fragments identifie... Read More about Specific oligonucleotide primers for the identification of Pseudomonas syringae pv. pisi yield one of two possible DNA fragments by PCR amplification: evidence for phylogenetic divergence.

Evidence for the growth of Plasmodiophora brassicae in vitro (1996)
Journal Article
Arnold, D. L., Arnold, D. L., Blakesley, D., & Clarkson, J. M. (1996). Evidence for the growth of Plasmodiophora brassicae in vitro. Mycological Research, 100(5), 535-540. https://doi.org/10.1016/S0953-7562%2896%2980005-0

Plasmodiophora brassicae is a root-invading pathogen that causes club root disease of brassica crops. Although generally regarded as an obligate biotroph, a number of reports over the last century have suggested that the organism may have a free livi... Read More about Evidence for the growth of Plasmodiophora brassicae in vitro.

Somaclonal variation in watercress for resistance to crook root disease (1995)
Journal Article
Arnold, D. L., Flegmann, A., & Clarkson, J. M. (1995). Somaclonal variation in watercress for resistance to crook root disease. Plant Cell Reports, 14(4), 241-244. https://doi.org/10.1007/BF00233641

Watercress (Rorippa nasturtium-aquaticum) shoots were regenerated from callus initiated from petioles on a range of media. The best coefficient of regeneration was obtained when callus was induced on a medium containing 0.25 mgl-1 thidiazuron and 0.0... Read More about Somaclonal variation in watercress for resistance to crook root disease.

The effects of temperature on zoospores of the crook root fungus Spongospora subterranea f.sp. nasturtii (1995)
Journal Article
ARNOLD, D. L., CLAXTON, J. R., Arnold, D. L., BLAKESLEY, D., & CLARKSON, J. M. (1995). The effects of temperature on zoospores of the crook root fungus Spongospora subterranea f.sp. nasturtii. Plant Pathology, 44(5), 765-771. https://doi.org/10.1111/j.1365-3059.1995.tb02733.x

The effect of temperature on the release, survival, encystment and infectivity of Spongospora subterranea f.sp. nasturtii zoospores released from diseased watercress roots was studied. There was rapid, synchronized release of zoospores at 20°C follow... Read More about The effects of temperature on zoospores of the crook root fungus Spongospora subterranea f.sp. nasturtii.

Development and Evaluation of a Laboratory‐Based Technique for Screening Somaclonal Regenerants of Watercress (Rorippanasturtium‐aquatium) for Resistance to Crook Root Disease (Spongospora subterranea f. sp. nasturtii) (1994)
Journal Article
Arnold, D. L., Arnold, D. L., Flegmann, A. W., & Clarkson, J. M. (1994). Development and Evaluation of a Laboratory‐Based Technique for Screening Somaclonal Regenerants of Watercress (Rorippanasturtium‐aquatium) for Resistance to Crook Root Disease (Spongospora subterranea f. sp. nasturtii). Journal of Phytopathology, 141(2), 202-208. https://doi.org/10.1111/j.1439-0434.1994.tb01462.x

A laboratory based method has been developed for infecting watercress with the crook root fungus (Spongospora subterranea f.sp. nasturtii). This utilised plastic trays of nutrient solution on which watercress shoots, supported by floats, were grown f... Read More about Development and Evaluation of a Laboratory‐Based Technique for Screening Somaclonal Regenerants of Watercress (Rorippanasturtium‐aquatium) for Resistance to Crook Root Disease (Spongospora subterranea f. sp. nasturtii).