Union Catalogue of Agricultural Libraries in the Netherlands
The WUR Library Catalogue contains bibliographic data on books and periodicals held by the libraries of Wageningen University and Research Centre and some 15 associated libraries. Holding data are added to each record.
Subjects covered include Agrotechnology, Food and Food Production, Plant and Animal Sciences, Soil Science, Geo-information, Landscape and Spatial Planning, Water and Climate, Ecosystem Studies, Economics and Society.
The joint collections of the participating libraries cover a substantial part of the internationally available scientific literature in these disciplines.
As far as Dutch scientific literature in these fields is concerned, coverage can be considered near 100%, including much of the so-called "grey literature".
All titles are entered in their original language. Keywords are added to facilitate subject searching.
The database is updated every day and now contains over 830.000 records.
Various strains of TMV occur in susceptible crops of tomato. This variability is of importance to resistance breeding and to cross protection as alternative methods of control. Strains of TMV differ in the kind of symptoms expressed and in the extent of the host range. Symptom variation allows for the distinction of eight strains of which the tomato strain is the most important. On a host range including Solanum pennellii, Lycopersicon esculentum CStMW-18 and L.peruvianum four strains are differentiated which correspond with Pelham's Strains 0, 1, 2 and 2 a. Strains of TMV also differ as to longevity in vitro. The prevailing Strain 0 and Strain 1 an more persistent than Strain 2. The instability shown by Strain 2 aduring isolation suggests that in practice it may not easily overcome the resistance of the gene Tm-2 a. The symptomless nitrous acid mutant MII-16 which is discussed in relation to cross protection is also less persistent than its parent tomato strain. This necessitated a careful preparation of the inocula for commercial use.
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