Components of Resistance that Reduce the Rate of Epidemic Development

Parlevliet, J.E.

doi:10.1146/annurev.py.17.090179.001223

Cited by 517 publications

(386 citation statements)

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“…The latter tends to be of a polygenic or oligogenic nature and is often highly durable (Parlevliet 1993). The durability of quantitative resistance has been demonstrated in various other cereal-rust pathosystems (Parlevliet 1979;Van Ginkel and Rajaram 1993;Broers et al 1996). Also some barley cultivars with high levels of quantitative resistance, such as ''UNA-80'', ''IBTA-80'', ''Kolla'', ''Terá n-78'' and ''Calicuchima-92'', that were released in South America by national programs in the late 1970s and early 1980s, are still resistant to yellow rust.…”

Section: Introductionmentioning

confidence: 99%

Quantitative resistance and its components in 16 barley cultivars to yellow rust, Puccinia striiformis f. sp. hordei

et al. 2006

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Sixteen barley cultivars with a susceptible infection type (IT = 7-8) in the seedling stage to an isolate of race 24 of Puccinia striiformis f. sp. hordei were planted at two locations in Mé xico. Disease severity (DS) parameters were assessed for the flag leaf and for the upper three leaves. The cultivars represented at least five levels of quantitative resistance ranging from very susceptible to quite resistant. ''Granado'', ''Gloria/Copal'' and ''Calicuchima-92'' represented the most resistant group and had an IT of 7 or 8. The cultivar · environment interaction variance, although significant, was very small compared with the cultivar variance. The disease severity parameters were highly correlated. The monocyclic parameter DS m , measured when the most susceptible cultivar had reached its maximum DS, was very highly correlated with the area under the disease progress curve (AUDPC), r being 0.98.Components of quantitative resistance were evaluated in two plant stages. In the seedling stage small cultivar effects for the latency period were observed, which were not correlated with the quantitative resistance measured in the field. In the adult plant stage the latency period (LP), infection frequency (IF) and colonization rate (CR) were measured in the upper two leaves. The LP was much longer than in the seedling stage and differed strongly between cultivars. The differences in IF were too large, those in CR varied much less. The components showed association with one another. The LP and IF were well correlated with the AU-DPC (r = 0.7-0.8).

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Section: Introductionmentioning

confidence: 99%

Quantitative resistance and its components in 16 barley cultivars to yellow rust, Puccinia striiformis f. sp. hordei

et al. 2006

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“…Crop resistance is defined as the ability of the host to hinder the infection and/or growth of the pathogen. Partial resistance is a form of incomplete resistance in which spore production is reduced even though the host plants are susceptible to infection (susceptible infection type) (Parlevliet, 1979). Partial resistance can be assessed by measuring the amount of disease and by screening the infection type.…”

Section: Introductionmentioning

confidence: 99%

Genetic variation in partial resistance to leaf rust in winter wheat: disease progress, foliage senescence and yield reduction

Spitters¹,

Roermund

Nassau³

et al. 1990

Netherlands Journal of Plant Pathology

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Relations between leaf rust progress, foliage senescence and yield reduction were studied for seven winter wheat genotypes, differing in their partial resistance to leaf rust. Leaf rust accelerated leaf and ear senescence. Photosynthesis measurements showed, however, that the photosynthetic capacity of the remaining green surface was not affected. Differences between genotypes in yield reduction were largely explained by differences in leaf senescence and, therefore, in cumulative light interception (r = 0.83) and crop photosynthesis. Reduction in cumulative light interception was closely related to the area under the disease-progress-curve (r = 0.85), which was also closely associated with yield reduction (r = 0.88). However, the time taken to reach a 501t!o reduction of green leaf area and the pustule density on I July (i.e. halfway through the epidemic) were just as good predictors of yield reduction as cumulative light interception and area under diseaseprogress-curve, suggesting that the former are useful criteria in the selection for partial resistance to leaf rust.

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“…Um aspecto importante a ser considerado neste contexto é a ausência de esporulação na maioria dos genótipos estudados. Esta reação é a que reduz o inóculo inicial (x Q ) e não a taxa de crescimento da doença (x), importante no dimensionamento do nível de resistência horizontal de um genótipo (Parlevliet, 1979 …”

Section: Resultados ε Discussãounclassified

Reação de dez clones de Seringueira (Hevea benthamiana) a três isolados de Microcyclus ulei

et al. 2001

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RESUMO -Avaliou-se a reação de dez clones de seringueira (Hevea benthamiana Muell. Arg.) frente a três isolados de Microcyclus ulei (P. Henn.) v. Arx, pertencentes aos grupos de patogenicidade I e II, quanto aos parâmetros monocíclicos: período de incubação, período latente, diâmetro da lesão e tipo de reação. Inoculou-se uma suspensão de 2 χ 10 5 conídios/ml na superfície abaxial de folíolos nos estádios B1/B2, deixou-se por 24 horas em câmara úmida a 24 ± lºC e transferiu-se para câmara de crescimento à mesma temperatura até a última avaliação aos 15 dias. A maioria dos clones testados apresentou resistência aos três isolados. Verificou-se ausência de interação entre clones e isolados com relação ao período de incubação, mas verificou-se interação altamente significativa entre clones e isolados em relação ao diâmetro de lesão. Os clones CNSAM 8218 e CNSAM 8219 foram altamente resistentes e apresentaram os menores diâmetros médios de lesão quando confrontados com o isolado EB1, diferindo significativamente dos demais. CNSAM 8212 também apresentou menor diâmetro de lesão frente ao isolado EB2. O CNSAM 8205, por sua vez, apresentou o maior diâmetro médio de lesão quando inoculado com o isolado EB1 e reação semelhante ao CNSAM 8204 quando inoculado com os isolados EB2 e MB1 e ao CNSAM 8201 quando inoculado com o isolado EB2. Concluiu-se que os clones avaliados apresentaram resistência vertical, o que os torna impróprios para um programa de melhoramento genético de seringueira que vise a obtenção de materiais com resistência horizontal ao M. ulei. Palavras-chave: Mal das folhas, resistência vertical Reaction of Ten Clones of Rubber (Hevea benthamiana) to Three Microcyclus ulei IsolatesABSTRACT -The reaction of ten rubber clones (Hevea benthamiana) to three isolates of Microcyclus ulei (P. Henn.) v. Arx from two pathogenicity groups I and II was evaluated. The monocyclic parameters incubation period, latent period, lesion size and reaction type were the B1/B2 stage; the seedlings were placed a humid chamber during 24 hours at 24 ± lºC, then transfered to a growth chamber at the same temperature until the last evaluation at 15 days. The majority of the clones showed resistance to the three isolates. There was no significant with isolate EB2. These clones show vertical resistance making their unsuitable for the rubber breeding program that plans to obtain clones with horizontal resistance to M. ulei.

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Components of Resistance that Reduce the Rate of Epidemic Development

Cited by 517 publications

References 21 publications

Quantitative resistance and its components in 16 barley cultivars to yellow rust, Puccinia striiformis f. sp. hordei

Quantitative resistance and its components in 16 barley cultivars to yellow rust, Puccinia striiformis f. sp. hordei

Genetic variation in partial resistance to leaf rust in winter wheat: disease progress, foliage senescence and yield reduction

Reação de dez clones de Seringueira (Hevea benthamiana) a três isolados de Microcyclus ulei

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