Rice blast, caused by the fungus Magnaporthe
grisea, is the most widespread and damaging fungal disease
of rice worldwide. Developing durable resistance to
this disease is a major breeding objective. The RESIDIV project
aims at improving our knowledge of rice resistance diversity
and of the diversity of the pathogen in its ability to attack
different varieties (avirulence/virulence).
The resistance gene in Chinese varieties will be characterized
by three complementary methods. Several new resistance
genes will probably be identified.
Avirulence genes of M. grisea will be identified
and mapped. These genes will be cloned, sequenced, and molecular
markers will be designed to characterize the diversity of
avirulence genes in the Chinese populations of the pathogen.
Characterization of rice resistance and blast avirulence is
needed for appropriate resistance gene deployment. The RESIDIV
project results will allow breeders to choose the most suitable
resistance genes and the best way to use them. This will ensure
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