Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 421846
Title Partial resistance of tomatoes against Phytophthora infestans, the late blight fungus
Author(s) Turkensteen, L.J.
Source Landbouwhogeschool Wageningen. Promotor(en): J.C. Zadoks. - Wageningen : Pudoc - ISBN 9789022004982 - 88 p.
Department(s) Wageningen University
Publication type Dissertation, internally prepared
Publication year 1973
Keyword(s) plantenziekteverwekkende schimmels - solanum lycopersicum - tomaten - phytophthora - planten - plaagresistentie - ziekteresistentie - partiële resistentie - plant pathogenic fungi - tomatoes - plants - pest resistance - disease resistance - partial resistance
Categories Epidemiology of Plant Pests and Diseases / Vegetables
Abstract <p/>In the Netherlands, the source of inoculum of the late blight fungus on tomatoes is the late blight fungus on potato crops. In regions of Europe mentioned, where tomatoes are grown in the open, <em>P. infestans</em> on tomatoes is the main source of inoculum. Especially in Bulgaria and Hungary, the effect of year-round cropping of tomatoes on prevalence and severity of the disease is obvious.<p/>In field and laboratory experiments, the pathogenicity to tomatoes of <em>P. infestans</em> originating from potatoes can be increased by serial passages through tomato foliage. In Europe, no other hosts than potatoes and tomatoes played a role in the tomato late blight epidemidogy. <em>Phacelia tanacetifolia</em> is added to the host list of the fungus. For the purpose of genetics classification, two laboratory methods, probit - log dosage analysis and components analysis, and one field method have been developed to assess the resistance of tomatoes against <em>P.</em><em>infestans.</em><p/>In particular the components infection ratio, lesion extension and sporulation intensity were studied. In the field method, the 'apparent infection rate' r was used. For breeding purposes, a simplified field method was indicated. A comparison of the three methods was made.<p/>The resistance of tomatoes increased considerably until at least 8 weeks after seeding. Partial resistance of W.Va 700 against the 1-t-pathotype of <em>P.</em><em>infestans</em> is based on a single gene, here named Ph <sub><font size="-1">2</font></sub> .
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