Resistance in plants and nature of resistance (Week 14)

Plant diseases caused by viral, bacterial or fungal pathogens are the causes of enormous crop losses. The most important pathogens of economically important crop
plants are biotrophic and neorotrophic fungi. Under natural conditions plants co-exist with a variety of microorganisms which include the pathogenic fungi. Three possible
relationships of plants with the co-existing microbes are: (a) neutral or non-interaction, (b) beneficial interaction, and (c) harmful interaction. These interactions are termed as incompatible and compatible, respectively. Analyses of these interactions by classical genetic techniques have led to such proposals as the gene-for-gene hypothesis (Flor, 1956). However, these proposals and related studies contributed little to the enhancement of our understanding of the actual mechanism of disease resistance or susceptibility.
 

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