Plant diseases: Infection and response: Biology: GCSE (9:1)

• Tobacco mosaic virus


  A plant virus which causes a mosaic pattern on the leaves which slows photosynthesis and therefore growth

  
• Rose black spot


  A fungal disease where black spots develop on rose plant leaves, which often turn yellow and drop early

  
• Pathogen


  A microorganism such as bacteria, viruses, protists and fungi that can cause harm to an organism

  
• Horticulturist


  An expert in plant cultivation and management

  
• Insect


  A small invertebrate animal that can be a source of plant infection

  
• Ion deficiency


  A lack of mineral ions that can lead to specific issues in a plant
• Optimum conditions


  The conditions needed for an organism to thrive such as ideal mineral content in the soil for plant development
• Stunted growth


  Growth that is not in keeping with average rates

  
• Aphids


  An insect pest that infests plants and feeds from the phloem using needle-like mouthparts

  
• Nitrate deficiency


  Causes stunted growth in plants

  
• Magnesium deficiency


  Causes chlorosis in plants

  
• Chlorosis


  Yellowing of leaves

  
• Nitrate ions


  Needed by plants to synthesise proteins for growth

  
• Magnesium ions


  Needed by plants to make chlorophyll for photosynthesis