Agriculture Reference
In-Depth Information
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been a lack of variation for resistance to some pathogens and the loss of resistance to
others as the pathogen populations have developed virulence to existing resistance genes.
Overcoming the latter problem may be solved in some instances through the develop-
ment of a better understanding of the genetic control of durable resistance in existing
germplasm, while the development of a more detailed knowledge of the biochemical and
genetic basis of the interaction between host and pathogen may unlock new opportunities
for developing novel forms of resistance that can be introduced through genetic manipu-
lation technologies. Some of these novel resistances are likely to be no more durable than
existing resistances, but there is good reason to believe that genes involved in general
or non-host resistance mechanisms, less prone to changes in pathogen virulence, can be
identifi ed and developed into new varieties.
Existing resistance sources can also be made both more effective and durable if
deployed in a more strategic manner. The most effective strategy will be to reduce the
level of inoculum in the environment by avoiding the cultivation of the most susceptible
varieties and also by adopting chemical and/or agronomic management strategies that
will reduce inoculum levels by other means.
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