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PL PATH 513 DISEASE RESISTANCE IN PLANTS                                                                                 (2L+0P) III

Objective
To impart knowledge on disease resistance mechanisms in plants.

Theory

UNIT I
Introduction and historical development, dynamics of pathogenicity, process of infection, variability in plant pathogens, gene centres as sources of resistance, disease resistance terminology.

UNIT II
Disease escapes, disease tolerance, disease resistance, types of resistance, identification of physiological races of pathogens, disease progression in relation to resistance, stabilizing selection pressure in plant pathogens.

UNIT III
Host defence system, morphological and anatomical resistance, preformed chemicals in host defence, post infectional chemicals in host defence,phytoalexins, hypersensitivity and its mechanisms.

UNIT IV
Gene-for-gene concept, protein-for-protein and immunization basis, management of resistance genes. Strategies for gene deployment.

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