Host specificity and multiplication of eight isolates of Olpidium brassicae sensu lato and its related Olpidium sp
2005
Koganezawa, H. (National Agricultural Research Center for Western Region, Fukuyama, Hiroshima (Japan)) | Inoue, H. | Sasaya, T.
The host specificity of eight single-sporangial isolates of Olpidium species resembling O. brassicae sensu lato were examined by inoculating 36 plant species of 10 families in sea-sand culture with zoospore suspension. The multiplication of the isolates was assessed by counting number of zoospores and by observation of zoosporangia and resting spores in host roots. Among the isolates of O. virulentus, Woms-3 had the widest host range, followed by LE-4, WT-1, F-1, and TAK-1. These isolates showed distinct host specificities. The isolates of O. brassicae, CBG-3 and YR-2 as well as Olpidium sp. DKN-1 had relatively a narrower host range similar to each other. Oriental melon, watermelon, cowpea, soybean, eggplant and okra were compatible or moderately compatible host for all isolates. All isolates had high ability to penetrate into root cells of different plants. The penetration was not observed in only four cases. All the isolates, if infected, did not grow or poorly reproduced zoospores in celery, and in nematode suppressive crops sunn hemp, African marigold and oat.
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