Fungal Infection of Plants

Knogge, Wolfgang

doi:10.2307/3870224

Cited by 139 publications

(100 citation statements)

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“…Symptoms of the perthotrophic pathogen C. beticola are a consequence of the biological activity of cercosporin in the host cells (Daub and Ehrenshaft 2000). This fungal toxin leads to membrane damage and cell death after the fungus has penetrated the leaf through stomata to manipulate plant physiology to the benefit of the pathogen (Daub and Ehrenshaft 2000;Knogge 1996). Changes in spectral signature of CLS resulted from comparatively large necrotic areas.…”

Section: Discussionmentioning

confidence: 97%

“…In situ leaf reflectance measurements indicated specific spectral signatures for each disease. Physiological interactions between a fungal disease and its host plant vary depending on the pathogen (Jones and Dangl 2006;van Kan 2006;Knogge 1996). The pattern of responses and the degree of up-and down-regulation of each physiological process are related to the type of host-pathogen relationship.…”

Section: Discussionmentioning

confidence: 99%

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Spectral signatures of sugar beet leaves for the detection and differentiation of diseases

et al. 2010

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This study examines the potential of hyperspectral sensor systems for the nondestructive detection and differentiation of plant diseases. In particular, a comparison of three fungal leaf diseases of sugar beet was conducted in order to facilitate a simplified and reproducible data analysis method for hyperspectral vegetation data. Reflectance spectra (400-1050 nm) of leaves infected with the fungal pathogens Cercospora beticola, Erysiphe betae, and Uromyces betae causing Cercospora leaf spot, powdery mildew and rust, respectively, were recorded repeatedly during pathogenesis with a spectro-radiometer and analyzed for disease-specific spectral signatures. Calculating the spectral difference and reflectance sensitivity for each wavelength emphasized regions of high interest in the visible and near infrared region of the spectral signatures. The best correlating spectral bands differed depending on the diseases. Spectral vegetation indices related to physiological parameters were calculated and correlated to the severity of diseases. The spectral vegetation indices Normalised Difference Vegetation Index (NDVI), Anthocyanin Reflectance Index (ARI) and modified Chlorophyll Absorption Integral (mCAI) differed in their ability to assess the different diseases at an early stage of disease development, or even before first symptoms became visible. Results suggested that a distinctive differentiation of the three sugar beet diseases using spectral vegetation indices is possible using two or more indices in combination.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Spectral signatures of sugar beet leaves for the detection and differentiation of diseases

et al. 2010

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“…A lectin-like receptor kinase is strongly induced upon chitin elicitation in Arabidopsis (Zhang et al 2002). Lec-RLKs possess the structural requirements to bind complex glucans (Barre et al 2002), such as oligosaccharide elicitors, which are capable of inducing defence responses, as exemplified in soybean by a specific heptaglucan from Phytoptora sojae (Knogge 1996).…”

Section: Discussionmentioning

confidence: 99%

Nucleotide binding site/leucine-rich repeats, Pto-like and receptor-like kinases related to disease resistance in grapevine

Gaspero

Cipriáni

2003

Mol Gen Genomics

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Nucleotide Binding Site/Leucine-Rich Repeat (NBS-LRR) and Serine/Threonine Kinase (STK) genes are two of the known classes of resistance (R-) genes in plants, and occur in large multigene families. Systematic identification of genes for NBS-LRRs and STKs provides a means of access to genomic regions that may be involved in disease resistance. Here we present a picture of these two families of R-gene analogs (RGAs) in grape with the aim of developing a set of resistance-related sequence-tagged-site (STS) markers. One hundred and three NBS-LRR sequences were isolated. They included members of the CC (coiled-coil) and TIR (Toll-interleukin receptor) sub-classes. A comparative analysis with other angiosperm NBSs is provided. Fifty-three genes for receptor-like kinases (RLKs) with serine/threonine specificity were identified. RLK sequences formed a putative monophyletic group within the kinase superfamily. They were similar to both cytoplasmic RLKs, such as Pto, and RLKs with LRR, S-locus, lectin-like and thaumatin-like extracellular binding-domains. The latter resembled the products of the R-related genes Xa21, FLS2, Rlk10, SFR2, and PR5K. Forty-five reference RGAs were converted into STSs by using appropriately designed specific primers. RGA-STSs were present in diverse grape genotypes, and >85% of the primers were capable of amplifying the STSs across the taxa Vitis and Muscadinia. DNA sequence polymorphism among these RGAs was assessed by SSCP (single-strand conformation polymorphism) analysis in over 20 Vitis spp. Finally, 45 universal primers for grape RGAs are proposed that should permit tagging of R-related regions in any grape genome.

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“…These compounds activate several processes involved in signal transduction pathway (Niirnberger and Nennstiel 1998). Facultative pathogens produce many enzymes hydrolysing structural polymers of plant cell walls (Knogge 1996). The products of this process may initiate cascade of the events leading to expression of defence genes (Dixon and Lamb 1990).…”

Section: Discussionmentioning

confidence: 99%

Reaction of winter oilseed rape callus to different concentrations of elicitors: pectinase or chitosan

2003

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The aim of the presented methodical experiments was 1) the evaluation if callus of winter oilseed rape (Brassica napus var. oleifera L.) initiates a defence reaction to fungal elicitors: pectinase (polygalacturonase) or chitosan, and 2) the choice of the elicitor doses, which evoke the strongest tissue reaction. The results obtained will be used in the next experiments relating the studies of pathogenesis mechanisms proceeding in rape plants infected by necrotrophic fungi. The defence response was estimated on the basis of changes in electrolyte leakage from cells, metabolic efficiency, phenolic content and catalase activity. In the experiment pectinase was used at concentration of 3, 8, 16, 133 and 166 ~tl per 1 cm 3 of culture medium while chitosan at: 25, 50, 75 and I00 lag.cm 3. Both elicitors increased cell membrane permeability: pectinase at the doses 3 3 equal orgreater to 16 lal.cm -while chitosan of 25 lag.cm-. The greatest metabolic inefficiency was observed in calli elicited with 16 pl.cm 3 pectinase and with chitosan of 100 lag.cm -3. The decrease in phenolic content was noted under influence of most doses of both elicitors. The highest catalase activity was evoked by pectinase of 8 lal.cm -3 and chitosan of 75 and 100 pg.cm 3. The results indicated that 8-16 lal.cm -3 of pectinase and 100 lag.cm 3 of chitosan caused the strongest defence reaction of oilseed rape tissue. List of abbreviations: B A P -6-benzylaminopurine;CAT -catalase; DW -dry weight; EL -electrolyte leakage; FW -fresh weight; HE -heat emission; MEC -metabolic efficiency coefficient; P -p h e n olics; P A L -phenylalanine ammonia-lyase; R -respiration rate; ROS -reactive oxygen species; 2,4-D -2,4-dichlorophenoxyacetic acid.

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Fungal Infection of Plants

Cited by 139 publications

References 0 publications

Spectral signatures of sugar beet leaves for the detection and differentiation of diseases

Spectral signatures of sugar beet leaves for the detection and differentiation of diseases

Nucleotide binding site/leucine-rich repeats, Pto-like and receptor-like kinases related to disease resistance in grapevine

Reaction of winter oilseed rape callus to different concentrations of elicitors: pectinase or chitosan

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