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GrainGenes Reference Report: EJP-108-163

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Reference	EJP-108-163
Title	Development of stem-base pathogens on different cultivars of winter wheat determined by quantitative PCR
Journal	European Journal of Plant Pathology
Year	2000
Volume	108
Pages	163-177
Author	Nicholson P [ Show all 6 ]
Abstract	Summary: The progress of development of stem-base pathogens in crops of second winter wheat was plotted in nine experiments in three years. The amount of each pathogen present was determined by quantitative PCR. Where Tapesia yallundae was present in quantifiable amounts, it usually developed earlier than the other eyespot pathogen, T. acuformis. Both species were usually present in greater amounts on cultivars which are more susceptible to eyespot. The sharp eyespot pathogen, Rhizoctonia cerealis, developed more erratically than either of the Tapesia spp. and there were no consistent effects on different cultivars. Fusarium spp., the cause of brown foot rot, were rarely present in quantifiable amounts, but Microdochium nivale was usually present as one or both of the varieties nivale and majus. Late-season (after anthesis) decreases in M. nivale suggest that any brown foot rot symptoms attributable to this fungus would have fully developed earlier. Cultivar differences in amounts of M. nivale were most clear in stems during internode extension and when relatively large amounts of DNA were present. Such differences approximately reflected eyespot susceptibility, cv. Soissons containing most and cv. Lynx containing least DNA. The results emphasise the difficulty in relating diagnoses, by quantitative PCR or other means, at early growth stages when decisions to apply fungicides against stem-base disease are made, to later disease severity
Keyword	[ Hide all but 1 of 30 ] crops cultivar development disease disease course dna extension fungal diseases fungus fusarium spp gene expression growth internodes mixed infections monographella nivalis pcr polymerase chain reaction quantitative quantitative genetics quantitative pcr rhizoctonia cerealis stem susceptibility symptoms tapesia triticum aestivum varieties wheat winter winter wheat

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