期刊
MICROBIOLOGICAL RESEARCH
卷 161, 期 1, 页码 1-8出版社
ELSEVIER GMBH, URBAN & FISCHER VERLAG
DOI: 10.1016/j.micres.2005.04.003
关键词
oomycete; host-specificity; elongation zone; root discoloration
类别
Seven plant species (lucerne, maize, oat, sugarbeet, sorghum, tomato, wheat) and 12 Pythium and Phytophthora species were used in a comparative study designed to investigate the effects of plant and oomycete inter-specific variation on zoospore encystment density and pathogenicity. Zoospores showed differential encystment behaviour and they encysted more on dicotyledonous than on monocotyledonous plants. Pythium aphanidermatum, P deliense, and Phytophthora nicotianae were the most aggressive species. Sugarbeet was the most severely attacked plant species followed by tomato white oat plants were relatively unaffected. The relationship between zoospore encystment on roots and disease severity depended on the oomycete-plant combination. Correlation analysis between zoospore encystment density and disease severity indicated low and no significant levels (p <=.05) of association for most plant-oomycete combinations. (c) 2005 Elsevier GmbH. All rights reserved.
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