Topic 5 - Plant Barriers Aginst Disease Flashcards
What are the two main types of barriers plants use against disease?
Physical barriers and chemical barriers
Physical barriers include structural defenses, while chemical barriers involve biochemical responses.
What is a physical barrier that plants have to prevent pathogen entry?
A thick cellulose cell wall
This cell wall is impermeable to many pathogens.
What role does the waxy cuticle on leaves play in plant defense?
Acts as a barrier to most pathogens
The cuticle is a protective layer on the surface of the leaf.
How do trees prevent pathogens from reaching their inner tissues?
A layer of bark
Bark serves as a protective outer covering for the tree.
What can leaves do to stop pathogens from entering the plant?
Close their stomata
Stomata are small pores that facilitate gas exchange.
What types of substances can some plant cells produce as a chemical barrier?
Antimicrobial chemicals, proteins, and enzymes
These substances help to inhibit the growth of pathogens.
What strategy do some plants use to deter pests through chemical means?
Release compounds that attract larger insects
These larger insects prey on the pests, providing a natural form of pest control.
What can be extracted from some plants for medicinal use?
Antimicrobial compounds
These compounds can be used in drugs such as antibiotics.