Plants, also called green plants are multicellular , autotrophic eukaryotes of the kingdom plantae.
Major plant pathogen
Bacteria
Virus
Fungi
Nematodes
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When pathogen attack on plants the genes of pathogen are activated (produce all their weapons of attack e:g enzymes, toxin etc).
Hafiz Muhammad Rizwan Mazhar
Department of Plant Pathology, University of Agriculture, Faisalabad-Pakistan
                                            (E-mail: rizwanmazhar084@gmail.com)
Plant show Resistance in Different Ways
Polygenic
Monogenic
Induced
Polygenic Resistance
Many genes include in such type of resistance
Some plant genes code for the chemical substances
Toxic to pathogen or neutralize the toxin of pathogen
Some structural genes also preasant which slow down the entry of pathogen
Plant show resistance partiallt or incompletely
Different genes are involved
Plant pathogen attack
Monogenic, r- gene Resistance
Have one resistance genes per pathogen capable of attacking it.
Pathogen____ host
A-virulence genes in pathogen
Trigger the R-genes in the host
Host will plant show the resistance
Induced Resistance
Induced resistance is adefense system within plant which allow them to resist attack from pests such as fungal or bacterial pathogen. The defense system react to the external attack with physiological changes triggered by the generation of proteins and chemicals that lead to activation of plants immune system
Two main types of induced resistane exist
SAR ISR
SAR (systemic acquired resistance): occur when a localized wound is created on the plant causing necrosis
ISR(induce systemic resistance): occur when plant roots are colonized by plant growth promoting rhizobacteria
