Physiologische Veränderungen in der Kartoffelknolle nach Verletzung und Infektion mitPhytophthora infestans

Schöber, Bärbel

doi:10.1007/bf02355917

Cited by 12 publications

(2 citation statements)

References 9 publications

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“…In the 50's and early 60's most emphasis was on phenolic substances like chlorogenic acid and corresponding enzymes such as phenylalanine ammonia lyase, PAL, and peroxidases, PPO. It was concluded that reactions responsible for the production of these compounds were part of the lignification process of the cells and that, in addition, the oxidation products were fungitoxic (Sch6ber, 1971;Friend et al, 1973). A rapid increase in mRNA for PAL was found (Fitzemeier et al, 1987), which was more pronounced with the incompatible reaction than with the compatible one.…”

Section: Biochemical Aspects Of Pathogenesismentioning

confidence: 96%

Recent and future developments in potato fungal pathology

Schöber

Turkensteen²

1992

Netherlands Journal of Plant Pathology

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An overview is given on the world-wide occurrence and frequency of mating type A2 of Phytophthora infestans, on ploidy levels, increased virulence and fitness of the pathogen population in Germany and the Netherlands. Experiments on the survival of oospores in the open showed that these may survive in Europe until the next growing season. The resistance reaction of the differential set of R-genes used to determine virulence of races of P. infestans is found to vary by differential clone and test method. Work has been started to come to a more homogenous differential set. The impact of oospores and the new population of P. infestans on epidemiology and hence on disease forecasting is unknown.During the past 40 years, considerable research efforts have been made to reveal the biochemical pathways of pathogenesis, compatibility and incompatibility of the host-pathogen reaction of P. infestans. However, the questions about host-pathogen recognition, the genes involved and which chemical compounds cause hypersensitivity or durable resistance, have not been answered yet. It is expected that the modem molecular biological approaches will more rapidly lead to such answers. One of such approaches, RFLP fingerprinting, indicated a total replacement of the old European population of P. infestans by a new one, and revealed the origin of Mendelian aberrations found to be due to selfing when crossing isolates.The world-wide occurrence ofPhoma exigua var.foveata, the causal organism of gangrene, is discussed and a clue on its possible origin and time of introduction in Europe is given. Soil infestation is a minor but persistent source of infection and impedes elimination of the pathogen. Green-cropharvesting, a new vine killing method, considerably reduced the level of black scurf caused byRhizoctonia solani and of gangrene as compared to other vine killing methods. Promising results have been obtained combining green-crop-harvesting and the application of antagonistic organisms in controlling black scurf and Erwinia spp. Integrated control of dry rot and gangrene seems to have a better future than the use of systemic fungicides.

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Section: Biochemical Aspects Of Pathogenesismentioning

confidence: 96%

Recent and future developments in potato fungal pathology

Schöber

Turkensteen²

1992

Netherlands Journal of Plant Pathology

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“…Furthermore, chlorogenic acid is supposed to have a critical role in defence responses of plants against fungal pathogens (Yao et al, 1995). It is thought to be involved in the resistance of potato tubers to Phytophthora infestans (Schöber, 1971) and to Streptomyces scabies (Dickinson & Lucas, 1987). De Ascensao & Dubery (2000Dubery ( , 2003 reported a substantial increase in total soluble phenolics in FHIA banana roots early after treatment with an elicitor from F. oxysporum f. sp.…”

Section: Discussionmentioning

confidence: 99%

Identification of resistance sources and characterization of resistance factors in Brassica species to Verticillium longisporum

Eynck¹

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Chapter 1: Introduction Aims and objectives of the studyOilseed rape (Brassica napus L. oleifera) is at present the most important oilseed crop in Europe. The cultivation area in Germany was more than 1.5 M ha in 2007 (Federal Statistical Office, Germany, 2007; EUROSTAT, 2007). As a result of the increasing area under rapeseed cultivation and the relatively high crop rotation rate disease problems have become a major issue in current breeding efforts.Verticillium wilt caused by the hemibiotrophic pathogen Verticillium longisporum (ex. V. dahliae var. longisporum Stark; comb. nov. Karapapa) is one of the principal diseases in the cultivation of oilseed rape, besides blackleg and stem canker caused by Phoma lingam and stem rot caused by Sclerotinia sclerotiorum. Soil inoculum in form of microsclerotia can gain densities that lead to a disease incidence of up to 100% (Zeise & Steinbach, 2004) in heavily infested fields. The control of these resting structures is particularly difficult because they can survive in the soil for several years (Schnathorst, 1981;. Due to the fact that chemical treatments have no effect on the occurrence of V. longisporum, the implementation of cultural practices such as crop rotation, time point of sowing, choice of intercrops and the use of resistant cultivars within an integrated disease management approach is the most promising strategy of controlling Verticillium wilt. Unfortunately, until now, breeding for resistance for both winter and spring type oilseed rape has been severely hampered by the absence of sufficient resistance in commercially available breeding material, however, recently, some promising genotypes of cabbage (B. oleracea) and turnip rape (B. rapa) with enhanced resistance were identified (Happstadius et al., 2003;Dixelius et al., 2005). In addition, oilseed rape cultivars with partial resistance also have the potential to reduce crop losses in an environmentally safe, cost-effective manner. Moreover, these cultivars can be combined with other control measurements to achieve optimal levels of disease management (Debode, 2005). Thus, in order to preserve the productivity of the intensive oilseed rape cropping areas in a sustainable, environment-friendly manner, the most promising approach to control Verticillium wilt of oilseed rape is to improve the resistance of the cultivars currently available. This work describes results from a joint project conducted in collaboration with the Institute of Plant Breeding of the Justus-Liebig-University of Giessen and the Association of German Plant Breeders e.V. (GFP) with the ultimate goal of improving the resistance of commercial cultivars to Verticillium. pursued throughout this project: In the first approach, the interaction of the host-specific species V. longisporum (compatible interaction) with B. napus was compared with the nonhost interaction of B. napus with V. dahliae. The differential interactions of V. longisporum and V. dahliae on the root surface and in the root and shoot vascular system of B. napus were studied ...

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Einfluss der Temperatur auf den Befall von Kartoffelknollen durch Pilze der GattungFusarium Lk.

Langerfeld¹

1973

Potato Res

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Physiologische Veränderungen in der Kartoffelknolle nach Verletzung und Infektion mitPhytophthora infestans

Cited by 12 publications

References 9 publications

Recent and future developments in potato fungal pathology

Recent and future developments in potato fungal pathology

Identification of resistance sources and characterization of resistance factors in Brassica species to Verticillium longisporum

Einfluss der Temperatur auf den Befall von Kartoffelknollen durch Pilze der GattungFusarium Lk.

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