The relationship between peroxidase activity in potato leaves and resistance toPhytophthora infestans

Umaerus, V.

doi:10.1007/bf02857274

Cited by 33 publications

(9 citation statements)

References 6 publications

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“…However, they advocated that field light intensity should be considered when comparative evaluations of general resistance to P. infestans are being made in different geographic areas. KAMMERMANN (1951) and UMAERUS (1959) independently reported day length as a factor which influences general resistance. Lesions appeared earlier on the foliage of potato varieties grown under short daily light exposure than during longer days (POHJA-KALLio etal.…”

Section: Discussionmentioning

confidence: 99%

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Relationship between Field Levels and Light and Darkness on the Development of Phytophthora Blight of Pigeon Pea (Cajanus cajan (L.) Millsp.)

Chauhan

1985

Journal of Phytopathology

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The incidence of Phytophthora blight of pigeon pea (Cajanus cajan (L.) Millsp.) caused by Phytophthora drechsleri f. sp. cajani was observed in the whole area of an experimental field plot where the topography varied. There was a positive correlation between low level of the field and maximum disease incidence. The incidence of disease was lowest at high field levels. This may be due to high or low moisture contents in both the levels. Leaf blight developed more rapidly under conditions of night darkness in the field and this was confirmed under conditions of artificial darkness in the glasshouse.

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Section: Discussionmentioning

confidence: 99%

“…1957). UMAERUS (1959) considered that the differential response of day length on lesion development may be due to some environmental factor(s) rather than due to day length.…”

Section: Discussionmentioning

confidence: 99%

Relationship between Field Levels and Light and Darkness on the Development of Phytophthora Blight of Pigeon Pea (Cajanus cajan (L.) Millsp.)

Chauhan

1985

Journal of Phytopathology

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“…It is interesting to note that Umaerus (1959) found peroxidase activity in various varieties of Solanum tuberosum positively correlated with field resistance to Phytophthora infestans. The same was reported by Fehrmann and Dimond (1967) for the relation between peroxidase activity and resistance of different parts of the potato plant.…”

Section: Stimulation Of Peroxidase Activitymentioning

confidence: 98%

Studies on the mode of action of phenylthiourea, a chemotherapeutant for cucumber scab

Sijpesteijn¹,

Sisler²

1968

Netherlands Journal of Plant Pathology

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In sap of cucumber plants treated with phenylthiourea (PTU) the concentration of this compound was too low to explain protection against Cladosporium cucumerinum by the fungitoxic action of this compound. The sap of treated plants did not contain an inhibitor of pectinase. In homogenates of PTU-treated plants polyphenol oxidase activity was completely inhibited whereas peroxidase activity was markedly higher than in those of control plants. On penetration of the fungus into the tissues of PTUtreated plants lignification around the infected areas was observed. This is ascribed to the increased peroxidase activity, whereas inhibition of polyphenol oxidase may result in an increased supply of phenolic precursors for lignification.

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“…1.11.1,7.) Seedling samples were harvested during the course of the cxperimeot and stored at -20 ' C; at this temperature leaves retain their original peroxidase activity (Umaerus, 1959), Tissues (5 g) were ground in 5 ml ice-cold distilled water, the slurry was passed through two layers of mnslin, and the supernatant resulting from centrifugation at 2750 g for 15 min at 4°C was diluted 1:4 with distilled water and used for determination of peroxidase activity. The assay was based on the method employed by Fehrmann & Dimond (1967).…”

Section: Enzyme Extraction From Sporangiamentioning

confidence: 99%

Development and physiology of infection by the downy mildew fungus Peronospora parasitica (Pers. ex Fr.) Fr. in susceptible and resistant Brassica species

Kluczewski

Lucas

1982

Plant Pathology

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The growth of two isolates of the downy mOdew fungus Peronospora parasitiea, one obtained from cauliflower (Brassica oleracea) and the other from oilseed rape (B. napus) was assessed in their respective hosts of origin, and also in the alternative combination. Both isolates were capable of infecting either host, but there were marked contrasts in the time course and extent of mycelial development, the amounts of associated host-cell necrosis, and eventual intensity of sporulation. Oilseed rape, which was partially resistant to the isolate from cauliflower, exhibited extensive necrosis of mesophyll cells, in conjunction with reduced mycelial development, and delayed and reduced sporulatioo by the pathogen. The isolate from, oilseed rape was virulent on both host species. Pathogenesis in the susceptible combinations was accompanied by large increases in electrolyte leakage, and increased activity of the enzymes /3-glucosidase, ribonuclease, and perO'Xidase. Effects OD chlorophyll content were variable and activities of acid phosphatase and acid phosphodiesterase were unaffected. Electrophoretic analyses of extracts from fungal sporangia and infected seedlings indicated that the large increases in j3-glucosi,dase were of pathogen origin, while evidence from inhibitor studies suggested that enhanced ribonuclease activity was due to a new post-infectional fonn of the enzyme. The significance of these findings is discussed in relation to pathogenesis and host resistance mechanisms.

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The relationship between peroxidase activity in potato leaves and resistance toPhytophthora infestans

Cited by 33 publications

References 6 publications

Relationship between Field Levels and Light and Darkness on the Development of Phytophthora Blight of Pigeon Pea (Cajanus cajan (L.) Millsp.)

Relationship between Field Levels and Light and Darkness on the Development of Phytophthora Blight of Pigeon Pea (Cajanus cajan (L.) Millsp.)

Studies on the mode of action of phenylthiourea, a chemotherapeutant for cucumber scab

Development and physiology of infection by the downy mildew fungus Peronospora parasitica (Pers. ex Fr.) Fr. in susceptible and resistant Brassica species

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