Plant Diseases
- Created by: Abc312
- Created on: 11-05-18 21:55
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- Plant disease
- Plant diseases can be detected by:
- Stuntedgrowth
- Spots on leaves
- Areas of rot
- Growths
- Malformed stems or leaves
- Discolouration
- The presence of pests
- Diseases can be identified by:
- Looking in a gardening manual or website
- Taking infected plants to a laboratory to identify the pathogen
- Using testing kits that contain monoclonal antibodies.
- Plants need mineral ions
- They get them from the soil
- A nitrate deficiency causes stunted growth
- Because nitrate ions are needed for protein synthesis and therefore growth.
- A magnesium deficiency causes chlorosis
- This causes yellow leaves
- Because magnesium ions are neededto make chlorophyll which is needed for photosynthesis
- Plant Defence responses
- Physical
- Cellulose cell walls
- Waxy cuticle on the leaves
- Layers of dead cells around the stems
- Eg. Bark on trees
- Physical barriers stop pathogens entering
- Chemical
- Antibacterial chemicals
- Eg. Mint plant and witch hazel
- Kill bacteria
- Poisons to deter herbivores
- e.g. Tobacco plants and foxgloves.
- Antibacterial chemicals
- Mechanical
- Thorns and hairs to deter animals
- Leaves which droop or curl when touched
- This knocks insects off and moves them away from things
- Mimicry to trick animals
- The passionflower has bright yellow spots which look like butterfly eggs
- This stops other butterflies laying real eggs there.
- The passionflower has bright yellow spots which look like butterfly eggs
- Physical
- Plant diseases can be detected by:
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