plant defences

• physical - waxy cuticle, provides physical barrier and prevents water landing on leaves

  • cell wall which form a physical barrier
  • produce callose which gets deposited between plant cell walls during times of stress e.g. pathogen invasion
• chemical - some plants produce saponins which destroy cell membranes of fungi and other pathogens

  • produce phytoalexins which inhibit the growth of fungi and other pathogens