Abstract— In contrast to most animals, plants are sessile organisms that they have not a circulatory system. So they have an innate immune system in each cell. In fact interaction between plants and their pathogens is based on systemic signaling capability from infection sites. In plant pathogen interaction sometimes pathogens produce elicitor and sometimes produce effector. On this basis, resistance in plants is divided to host and non host. On the other hand the plant responses depend not only on the recognition mechanisms but also very much on the biology of the interactions and genetic characteristics of plants and their pathogens. Gene – for – gene and the matching allel are two basic models for explanting of genetic basis of interaction between plants and their pathogens.
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