Rice blast, caused by Pyricularia grisea
Sacc., is a destructive disease of rice in most rice growing areas around the
world. Breeding efforts have been made to introduce genes for blast resistanceinto desirable genetic background. Resistance to rice blast is categorized two
types, complete (true) and incomplete (field resistance). Complete resistance
is a hypersensitive reaction, often a complete form of resistance, and is
characterized by a resistant infection type. More than 20 loci for complete
blast resistance have been identified.
Rice blast, caused by Pyricularia grisea Sacc.,
is a destructive disease of rice in most rice growing areas around the world.
Breeding efforts have been made to introduce genes for blast resistance into
desirable genetic background. Resistance to rice blast is categorized two
types, complete (true) and incomplete (field resistance). Complete resistanceis a hypersensitive reaction, often a complete form of resistance, and is
characterized by a resistant infection type. More than 20 loci for complete
blast resistance have been identified. Although cultivars with complete
resistance were developed, the resistance has rapidly been broken down by
compatible races of the pathogen. Field resistance, incomplete and usually
polygenic, is a susceptible infection type that allows effective control of a
parasite under natural field conditions and may be durable when exposed to new
races of blast.
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