Australian Plant responses

Question 1

two named pathogen asked to be investigated in syllabus

Answer 1

• Fungal pathogen
• viral pathogen

Question 2

example of fungal pathogen

Answer 2

myrtle rust

Question 3

viral pathogens

Answer 3

banana bunchy top disease

Question 4

myrtle rust

Answer 4

pathogen: puccinia psidii
plant: eculyptus
transmission:
- imported infected plant material
- despersal of spores by wind
- spread os spores by vehicles, clothinf and machinery to other plants
symptoms:
- purple yellow spots on leaves
- stunted growth
leafe, fruit and flower death

Question 5

what is the active defences to myrtle diseases

Answer 5

hypersensitive response:
mechanism used by plans to prevent the spread of pathogens to healthy tissue

Question 6

what is the passive defences of myrtle rust

Answer 6

physical barriers
- think bark
- thick cuticle
- drybleaf surface
- vertically hanging leaves

chemical barriers
- stories oils that are anti-bacterial and anti-fungal

Question 7

banana bunchy top disease

Answer 7

pathogen: banana bunchy top virus
plant: australian Musa
transmission:
- Vector
- direct - the virus can be carried long distances
symptoms:
- banana leaves develop a “bunched” appearance
- plants stop growing

Question 8

responses of banana bunchy top disease

Answer 8

passive:
- physical barriers - vaxy cuticles on leaves and stems provide physical barrier
- chemical barriers- chitinase enzymes in the plant ward off vectors