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Re-evaluation of the life-cycle of the nematode-parasitic bacterium Pasteuria penetrans in root-knot nematodes, Meloidogyne spp.

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For more content, see Nematologica.

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. Samples of infected females were nutritionally compromised by maintaining them in sterile saline at 30°C for different periods of time following their removal from the root system. Observations of these females maintained in saline revealed a series of growth stages of Pasteuria hitherto not documented, consisting of rhizoids, rod-like bacilli and granular masses. A new life-cycle for Pasteuria is described consisting of three phases: Phase I: attachment and germination; Phase II: rhizoid production and exponential growth; and Phase III: sporogenesis. These newly observed stages of the life cycle show a high degree of similarity to the developmental stages seen in other Bacillus spp.

Affiliations: 1: Nematode Interactions Unit, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK, Center for the Biology of Nematode Parasitism, North Carolina State University, Raleigh, NC 27695-7616, USA;, Email: keith.davies@bbsrc.ac.uk; 2: Nematode Interactions Unit, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK; 3: Nematode Interactions Unit, Rothamsted Research, Harpenden, Hertfordshire AL5 2JQ, UK, Center for the Biology of Nematode Parasitism, North Carolina State University, Raleigh, NC 27695-7616, USA

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/content/journals/10.1163/138855410x552670
2011-09-01
2016-12-10

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