Plant disease and defence
- Created by: GreenGooSnake
- Created on: 28-05-19 15:53
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- The Secret Life of Plants - Plant disease and defence
- Plants need MINERAL IONS
- Plants need MINERAL IONS from the SOIL. If there isn't enough, plants suffer DEFICIENCY SYMPTOMS.
- NITRATES - Needed to make PROTEINS and therefore GROWTH. Lack of causes STUNTED GROWTH.
- MAGNESIUM IONS - Make CHLOROPHYLL, needed for PHOTOSYNTHESIS. Will suffer from CHLOROSIS and have YELLOW LEAVES
- Plants need MINERAL IONS from the SOIL. If there isn't enough, plants suffer DEFICIENCY SYMPTOMS.
- Plants can get DISEASES
- Examples of diseases
- APHIDS
- Sharp mouthparts that penetrate PHLOEM, **** SAP. Act as vectors
- TOBACCO MOSAIC VIRUS
- Attacks leaves making them MOTTLED or DISCOLOURED
- BLACK SPOT
- Roughly CIRCULAR BLACK SPOTS on leaves.
- APHIDS
- Examples of diseases
- PHYSICAL, CHEMICAL AND MECHANICAL DEFENCES
- MECHANICAL DEFENCES
- Some MIMIC other organisms.
- Some plants are adapted to have THORNS and HAIRS. Stop animals from TOUCHING and EATING them.
- Some leaves DROOP and CURL. They knock INSECTS off and by MOVING AWAY from things.
- MECHANICAL DEFENCES
- Plants need MINERAL IONS
- Stunted GROWTH, Abnormal GROWTHS.
- Disease signs
- SPOTS on the leaves, MALFORMED stems or leaves
- Patches of DECAY, DISCOLOURATION
- Plants can get DISEASES
- Examples of diseases
- APHIDS
- Sharp mouthparts that penetrate PHLOEM, **** SAP. Act as vectors
- TOBACCO MOSAIC VIRUS
- Attacks leaves making them MOTTLED or DISCOLOURED
- BLACK SPOT
- Roughly CIRCULAR BLACK SPOTS on leaves.
- APHIDS
- Examples of diseases
- Signs can be identified by
- GARDENING MANUALS or WEBSITES.
- Taking the plant to a LABORATORY so the pathogen can be identified.
- TESTING KITS that identify the pathogen using MONOCLONAL ANTIBODIES
- Disease signs
- PHYSICAL DEFENCES
- WAXY CUTICLE, provides BARRIER
- CELL WALLS made from CELLULOSE, form a PHYSICAL BARRIER
- LAYERS of DEAD CELLS around their STEMS. E.g. outer part of BARK on trees stop pathogens from entering.
- PHYSICAL, CHEMICAL AND MECHANICAL DEFENCES
- MECHANICAL DEFENCES
- Some MIMIC other organisms.
- Some plants are adapted to have THORNS and HAIRS. Stop animals from TOUCHING and EATING them.
- Some leaves DROOP and CURL. They knock INSECTS off and by MOVING AWAY from things.
- MECHANICAL DEFENCES
- CHEMICAL DEFENCES
- Some plants produce ANTIBACTERIAL CHEMICALS which kill bacteria e.g. MINT PLANT and WITCH HAZEL
- Other plants produce POISONS which deter herbivores e.g. TOBACCO PLANTS, FOXGLOVES and DEADLY NIGHTSHADE
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