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Plant responses to pathogens, Screen Shot 2020-05-18 at 9.30.43 am, Screen…
Plant responses to pathogens
Passive Defences
Chemical barriers
Chemical barriers stored in plant leaves
produce enzymes that break down pathogens
Chemical receptors detect pathogen
Glucosides
Saponins
Enzymes
Brakdown
Pathogen toxins
Physical barriers
Cell wall
Physically prevents it
Thick cuticle
Withstand pathogen enzyme secretions
Small stomates
Prevents pathogen entry
Vertical anging leaves
Reduce water reservoirs
Pathogens can not accumulate
Active defences
Pathogen recognition
detecting physical and chemical signals
fragments from the cell walls of bacteria and fungi
Genes within the cells of the plant are thought to regulate plant responses.
rapid active responses
Minutes/ hours
allows the movement of certain ions into the cell and triggers defence responses by activating certain genes.
release of hydrogen peroxide (H2O2) in an oxidative burst can kill microbes directly
reinforcement of the cell wall
cell wall apposition
programmed cell death (apoptosis)
cluster of dead plant cells to accumulate around the pathogen to isolate it, followed by the secretion of antimicrobial compounds.
Delayed active response
limit the spread of pathogen
repair wounds in the bark
systemic acquired resistance
Salicylic acid may act as a signalling agent
limits the severity of subsequent infections with that pathogen
Aka. Plant defences
