Specificity of cell type and timing of events associated with papilla formation and the hypersensitive reaction in leaves of Hordeum vulgare attacked by Erysiphe graminis f.sp. hordei

Koga, Hironori; Bushnell, W. R.; Zeyen, R. J.

doi:10.1139/b90-299

Cited by 113 publications

(86 citation statements)

References 19 publications

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“…Death of subsidiary and mesophyll cells invaded by a haustorium was observed from the 3rd day after inoculation. During the time course of infection, cell death spread to adjacent epidermal and mesophyll noninvaded cells, as has been generally described for other coffee resistant genotypes (Martins et al, 1985;Rijo et al, 1991) and in plants resistant to other rust fungi and to other obligate biotrophs (Heath, 2000a, Koga et al, 1990Huang et al, 1998). In susceptible coffee plants, death of guard and subsidiary cells was observed from the 3rd day after inoculation, but only in a small percentage of infection sites (generally less than 20 %), in which the fungus had stopped its growth at early stages (Silva, 1996;Silva et al, 2002).…”

Section: Cytological and Biochemical Resistance Mechanismsmentioning

confidence: 64%

Coffee resistance to the main diseases: leaf rust and coffee berry disease

Silva

Várzea

Guerra‐Guimarães

et al. 2006

Braz. J. Plant Physiol.

186

147

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Considerable success has been obtained in the use of classical breeding to control economically important plant diseases, such as the coffee leaf rust and the coffee berry disease (CBD). There is a strong consensus that growing genetically resistant varieties is the most appropriate cost effective means of managing plant diseases and is one of the key components of crop improvement. It has also been recognized that a better knowledge of both, the pathogens and the plant defence mechanisms will allow the development of novel approaches to enhance the durability of resistance. After a brief description of concepts in the field of plant disease resistance, we attempt to give a view of the research progress on coffee leaf rust and CBD concerned with the pathogens infection and variability, coffee breeding for resistance and coffee resistance mechanisms. Key words: Coffea, Colletotrichum kahawae, Hemileia vastatrix, coffee breeding, resistance.Resistência do cafeeiro para suas principais doenças: ferrugem alaranjada das folhas e antracnose dos frutos: Sucesso considerável tem sido obtido no uso do melhoramento clássico para o controle de doenças de plantas economicamente importantes, tais como a ferrugem alaranjada das folhas e a antracnose dos frutos do cafeeiro (CBD). Há um grande consenso de que o uso de plantas geneticamente resistentes é o meio mais apropriado e eficaz em termos de custos do controle das doenças das plantas, sendo também um dos elementos chave do melhoramento da produção agrícola. Tem sido também reconhecido que um melhor conhecimento do agente patogênico e dos mecanismos de defesa das plantas permitirá o desenvolvimento de novas abordagens no sentido de aumentar a durabilidade da resistência. Após uma breve descrição de conceitos na área da resistência das plantas às doenças, nesta revisão tentou-se dar uma idéia do progresso na investigação da ferrugem alaranjada do cafeeiro e do CBD relativamente ao processo de infecção e variabilidade dos agentes patogênicos, melhoramento do cafeeiro para a resistência e mecanismos de resistência do cafeeiro. Palavras-chave: Coffea, Colletotrichum kahawae, Hemileia vastatrix, melhoramento do cafeeiro, resistência.

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Section: Cytological and Biochemical Resistance Mechanismsmentioning

confidence: 64%

Coffee resistance to the main diseases: leaf rust and coffee berry disease

Silva

Várzea

Guerra‐Guimarães

et al. 2006

Braz. J. Plant Physiol.

186

147

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“…However, there are also situations where HR is thought to occur too late to be the causal event for resistance (e.g. Barley Mlg resistance gene discussed above; Go È rg et al, 1993;Koga et al, 1990).…”

Section: Biotrophic and Obligate Pathogensmentioning

confidence: 99%

The hypersensitive response and the induction of cell death in plants

1997

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The hypersensitive response, or HR, is a form of cell death often associated with plant resistance to pathogen infection. Reactive oxygen intermediates and ion fluxes are proximal responses probably required for the HR. Apoptosis as defined in animal systems is, thus far, not a strict paradigm for the HR. The diversity observed in plant cell death morphologies suggests that there may be multiple pathways through which the HR can be triggered. Signals from pathogens appear to interfere with these pathways. HR may play in plants the same role as certain programmed cell deaths in animals with respect to restricting pathogen growth. In addition, the HR could regulate the defense responses of the plant in both local and distant tissues.

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“…Pallas were a gift from Dr Lisa Munk. Their generation has been described previously (Kolster et a/., 1986). …”

Section: Plant Materialsmentioning

confidence: 99%

Functional analysis and RFLP-mediated mapping of the Mlg resistance locus in barley

Gorg¹,

Hollricher²,

Schulze‐Lefert³

1993

Plant J

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SummaryThe semi-dominantly acting allele of the Mlg locus in barley confers a race-specific resistance to the causal agent of powdery mildew, Erysiphe graminis f.sp. hordei. High resolution genetic mapping via RFLP analysis enabled us to identify a set of markers on chromosome 4 which are either tightly linked or cosegregate with the resistance function. Comparison of marker distances in segregating F2 populations originating from different genotypes revealed an unexpected variation of recombination frequencies in the vicinity of the locus. Based on near-isogenic lines carrying either resistance gene Mlg or Mia12 and a cell-type specific analysis it was demonstrated that Mlgacts at an earlier stage of fungal development than MIa12. A time-course analysis of the early infection process combined with gene dosage experiments provided strong evidence that attacked cells retain viability after the defence response and that hypersensitive cell death (HR) is a secondary consequence, but not causally required for Mlg-mediated arrest of fungal growth. It is speculated that gene dosage experiments may provide a means to separate primary from secondary defence reactions.

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Specificity of cell type and timing of events associated with papilla formation and the hypersensitive reaction in leaves of Hordeum vulgare attacked by Erysiphe graminis f.sp. hordei

Cited by 113 publications

References 19 publications

Coffee resistance to the main diseases: leaf rust and coffee berry disease

Coffee resistance to the main diseases: leaf rust and coffee berry disease

The hypersensitive response and the induction of cell death in plants

Functional analysis and RFLP-mediated mapping of the Mlg resistance locus in barley

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