NEAR-WILT OF PEAS IN ONTARIO

1959 ◽  
Vol 39 (4) ◽  
pp. 483-490
Author(s):  
Blair H. MacNeill ◽  
Helen Howard
Keyword(s):  
Fusarium Oxysporum ◽  
Wilt Disease ◽  
Disease Response ◽  
New Era ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Race 2 ◽  
Host Parasite

It has been found that the near-wilt disease of peas, caused by Fusarium oxysporum f. pisi race 2 (Linford) Snyder & Hansen, is now present in the canning districts of Ontario. Conclusions as to the identity of the fungus associated with the wilting condition in field plants have been based upon a study of the differential disease-response of the pea varieties Little Marvel, W.R. Perfection and New Era, the histology of infection in the susceptible pea host, and the characteristics of the fungus when in culture. The capacity of the fungus to establish a symptomless host-parasite relationship with certain legumes not normally regarded as susceptible to the near-wilt pathogen has been demonstrated. The possible role of such "non-susceptible hosts" in perpetuating the fungus between pea crops has been discussed.

Host-parasite relationship between congenitalToxoplasmainfection and mouse brain: role of small vessels

Parasitology ◽  
1995 ◽  
Vol 110 (2) ◽  
pp. 123-127 ◽  
Author(s):  
T. A. Sims ◽  
J. Hay
Keyword(s):  
Mouse Brain ◽  
Inflammatory Cell ◽  
Tissue Cyst ◽  
Intimate Contact ◽  
Small Vessels ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Perivascular Area ◽  
Host Parasite

SUMMARYSmall vessels showing inflammatory cell infiltrates were invariably observed in the vicinity of intactToxoplasmatissue cysts within the brains of mice congenitally infected with the protozoan. Lymphocytes were observed in intimate contact with the luminal aspect of the endothelium, penetrating into the thickened basal lamina and in the perivascular area, which also contained macrophages and neutrophilic granulocytes. Rarely, lymphocytes were observed attached to the outer membrane of the host neurone which contained aToxoplasmatissue cyst and within the inflammatory infiltrate associated with a disintegrating cyst. An hypothesis is presented which combines these morphological observations to explain the events associated with tissue cyst associated recrudescence of latentToxoplasmainfection in mouse brain.

Role of porcine serum haptoglobin in the host-parasite relationship of Taenia solium cysticercosis

2016 ◽  
Vol 207 (2) ◽  
pp. 61-67 ◽  
Author(s):  
José Navarrete-Perea ◽  
Yanis Toledano-Magaña ◽  
Patricia De la Torre ◽  
Edda Sciutto ◽  
Raúl José Bobes ◽  
...  
Keyword(s):  
Taenia Solium ◽  
Porcine Serum ◽  
Serum Haptoglobin ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Host Parasite ◽  
Relationship Of

scholarly journals The role of adherence in determining the site of infection byCorynebacterium diphtheriae

1983 ◽  
Vol 90 (3) ◽  
pp. 415-424 ◽  
Author(s):  
Sarah J. Deacock ◽  
Kathleen A. Steward ◽  
H. R. Carne
Keyword(s):  
Epithelial Cells ◽  
Economic Status ◽  
Skin Lesions ◽  
Buccal Epithelial Cells ◽  
Mucous Membranes ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Host Parasite ◽  
Relationship Of

SUMMARYTwenty-nine strains ofCorynebacterium diphtheriaeisolated from throats and 29 strains from skin lesions, the latter mainly from communities of low socio-economic status in tropics and cold climates, have been examined for the property of adherence to human buccal epithelial cells. All throat strains showed adherence. In contrast, strains from skin lesions were predominantly poor adherers. These results indicate that strains ofC. diptheriaefrom throats must now be added to the important group of pathogens which possess the property of adherence to surface epithelial cells of mucous membranes, thus providing an essential first step in the process of colonizing their hosts. The possible role of this phenomenon of adherence to bucco-pharyngeal epithelial cells in the evolution of the host—parasite relationship ofC. diphtheriaeis discussed.

scholarly journals Infection of Mice Lacking Interleukin-7 (IL-7) Reveals an Unexpected Role for IL-7 in the Development of the Parasite Schistosoma mansoni

1999 ◽  
Vol 67 (8) ◽  
pp. 4183-4190 ◽  
Author(s):  
Isabelle Wolowczuk ◽  
Sophie Nutten ◽  
Olivier Roye ◽  
Myriam Delacre ◽  
Monique Capron ◽  
...  
Keyword(s):  
Schistosoma Mansoni ◽  
Humoral Response ◽  
Interleukin 7 ◽  
Intradermal Administration ◽  
Host Parasite Relationship ◽  
Parasite Relationship ◽  
Host Parasite ◽  
Deficient Mice ◽  
Specific Humoral Response

ABSTRACT A single intradermal administration of recombinant interleukin-7 (IL-7) has been shown to aggravate the course of murine schistosomiasis, to favor the development of Th2-associated antibodies specific for the parasite, and to alter migration kinetics and/or migratory route of the parasite within its vertebrate host. Here we show that after infection of IL-7-deficient mice with Schistosoma mansoni, the predominant parasite-specific humoral response follows a Th1 pattern, and the development of the parasite is greatly impaired. In IL-7-deficient mice, increased numbers of larvae reach the lungs and fewer larvae reach the liver, compared to control mice. In the absence of IL-7, female worms show an altered fecundity, leading to decreased numbers of eggs trapped in the tissues and to an amelioration of the pathology of the infected host. The most striking observation is the blockade of parasite growth in an IL-7-defective environment, leading to dwarf male and female worms. The results of this study have important implications for the role of IL-7 in the host-parasite relationship and show how parasites can disable or evade the host immune response.

A NEW RACE OF FUSARIUM OXYSPORUM f. PISI

1966 ◽  
Vol 46 (4) ◽  
pp. 343-347 ◽  
Author(s):  
A. T. Bolton ◽  
V. W. Nuttall ◽  
L. H. Lyall
Keyword(s):  
Fusarium Oxysporum ◽  
Host Range ◽  
Wilt Disease ◽  
The Other ◽  
Cultural Characteristics ◽  
New Era ◽  
Race 1 ◽  
New Race ◽  
Race 2 ◽  
Race 4

Pea varieties resistant to Fusarium wilt and near-wilt developed a wilt disease when grown in a field disease nursery at Ottawa. Two isolates of Fusarium oxysporum f. pisi (Linford) were obtained from infected plants. When tested, one of these was similar to F. oxysporum f. pisi race 2 (near-wilt) in host range and cultural characteristics. The other resembled F. oxysporum f. pisi race 1 (wilt) in morphology and cultural characteristics, but caused severe symptoms on New Era and Wisconsin 183, varieties resistant to races 1 and 2. It was concluded that this latter isolate is a new race; it is proposed that it be designated as F. oxysporum f. pisi race 4.

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