Title: The life-cycle, population dynamics and host specificity of a parasite of Heterodera avenae, similar to Pasteuria penetrans.
Abstract: SUMMARY The occurrence of a population of Pasteuria, similar to Pasteuria penetrans, and possibly a new species, parasitic on Heterodera avenue in a cereal-cyst nematode suppressive soil, is reported. The life-cycle was respicted to the H. avenue second-stage juvenile, and prevented such infected juveniles from invadmg plant roots. Between March and July, 38-56 ?h of the juveniles present in the soil had between one and five spores adhering to their cuticles; microcolonies could be seen in the juveniles as early as April, however, mature spores were not recorded until July. Developing females, and cysts extracted from plant roots were not infected by the bacterium. The suppressive soil also contained juveniles and adults of Pratylenchus and Tylenchorhynchus infected with Pasteuria. Although the spores adhering to, and within, al1 three nematode species were approximately the same size, between 4 and 5 Pm, it was not clear whether or not the Pasteuria population was either a single or a mixed population. Host specificity studies with spores extracted from the juveniles of H. avenue showed that it adhered to the cuticles of schachtii, H. glycines, Globodera rostochiensis, G. pallida and Meloidogyne javanica. Attempts to bait soil by adding these nematodes failed to result in the infection of females. It is reported the soil contained approximately 7 x IO3 spores per gram as evaluated using differential centrifugation.
Publication Year: 1990
Publication Date: 1990-01-01
Language: en
Type: article
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Cited By Count: 83
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