Download Durability of Disease Resistance by N. G. Hogenboom (auth.), Th. Jacobs, J. E. Parlevliet (eds.) PDF

By N. G. Hogenboom (auth.), Th. Jacobs, J. E. Parlevliet (eds.)

From February 24 -28, 1992 a global symposium on longevity of ailment Resistance was once held on the foreign Agricultural Centre in Wageningen, the Netherlands. The symposium, prepared by way of the dept of Plant Breeding of Wageningen Agricultural college and the Centre for Plant Breeding and Repro­ duction learn, CPRO-DLO, used to be a part of the DGIS funded programme sturdy Resistance in constructing nations. with none kind of prevention or security approximately all plants could be heavily or maybe seriously broken by way of a number pathogens. In glossy agriculture guy has been in a position to keep an eye on many if no longer such a lot pathogens utilizing i) insecticides, ii) phyto­ sanitary equipment reminiscent of keep an eye on of seed and plant fabric in an effort to commence a crop affliction loose, iii) agronomic measures resembling crop rotation, iv) ailment resis­ tance or mixtures of those measures. through the years using insecticides has elevated greatly and so did the professional­ blems linked to pesticide use, equivalent to environmental pollutants and development of resistance and tolerance to those insecticides within the pathogens. using resis­ tance too elevated strongly through the years and right here too difficulties arose.

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M. L. J. Joosten, 1991. Specificity of plant-fungus interactions: Molecular aspects of avirulence genes. Advances in Molecular Genetics of Plont-Microbe Interactions 1: 233-241. W. Sabel is, J. Takabayashi, J. A. Posthumus, 1981. Plant strategies of manipulating predator-prey interactions through allelochemicals: Prospects for application in pest control. Journal Chemical Ecology 16: 3091-3118. , 1976. Genetics of host-parasite relationships and uniform and differential resistance. Netherlands Journal of Plant Pathology 82: 133-145.

E. Parlevliet continuously during the breeding procedures. The current cultivars are relatively free from bacterial blight during most growing seasons, whereas unselected accessions from abroad quite often become heavily infected in the same breeders' nurseries. Based on the information discussed above the following strategy is suggested to avoid as much as possible major race-specific resistance genes and to accumulate partial resistance genes of which it is hoped that they are considerably more durable: in seg- regating, genetically heterogeneous populations the selection should aim at removal of the most susceptible entries (selection against susceptibility rather than for resistance) and removal of those entries that do not show any disease.

1983. Breeding soybeans resistant to diseases. Plant Breeding Rev. 1: 183-235. J. a. T. 2601 AUSTRALIA Summary The processes of spontaneous mutation, sexual recombination and somatic hybridization provide a large array of mechanisms whereby pathogenicity may arise and new combinations of virulence may be generated within individual pathogen populations. Additional variation can also occur through migration from other populations of a pathogen, or through a range of cytological and molecular changes.

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