Lecture 21 Flashcards
Name two disease causing microbes
•Viruses
•Bacteria
How do bacteria gain food
Via photosynthesis for example cyanobacteria.
What are scavengers
Share the environment around them. For example some bacterial endophytes gain nutrients from the leaf apoplast (space between cells).
What are pathogens in terms of bacteria gaining food
Gain nutrients by infect other living organisms. Plant pathogenic bacteria (heterotrophic).
What is Binary fission
A process where one cells divides to form two identical cells it is an example of Asexual reproduction
Name the stages of bacterial growth
•Lag
•Log
•Stationary
•Death
The market value for cut flowers and fresh foliage is around how much annually.
€16 billion
Name a serious disease on cherry laurel
Shot Hole
Symptoms of Shot Hole disease
Spots or lesions on the leaf, expanding in size as the population of the bacteria grows.
Kochs Postulate
• The pathogen must be present in every case of the disease.
• The pathogen must be isolated from the host with the disease and grown in pure culture.
• The specific disease must be reproduced when a pure culture of the pathogen is inoculated into a healthy susceptible host.
Name the shot hole disease levels
(A) Rotundifolia’. (B) ‘Novita’. (C) ‘Etna’. (D) ‘Caucasica’.
Definition of a virus
Sub microscopic entity consisting of a single nucleic acid (RNA/DNA) surrounded by a protein coat.
Viruses are only capable of replication when they are
within the living cells of plants, animals or bacteria.
What is the smallest organism
Viruses
Are viruses mobile or immobile
Immobile
