Rice (Oryza sativa L.) being one of the prime staple crops of
the world has a crucial role in the global food security and contributes for
the livelihood of majority of the Asian population. Rice production and
productivity are constrained by biotic and abiotic stresses in the growing
areas.
Rice blast caused by the fungus Pyricularia oryzae has been
recognized as one of the most serious diseases and is distributed
across 85 countries globally. Host plant resistance has been recognized as an important
strategy to manage blast disease compared to chemical control measures.
More than 100 blast resistance genes have been identified in
rice but effective and durable use of these reported genes has been limited
because of evolution of new virulent races of the fungus. Enhancing host plant
resistance through pyramiding of multiple resistance genes is one of the useful
strategies to avoid frequent breakdown of resistance.
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