Fungus Microbe Interactions Flashcards
1
Q
Different types of fungal interactions (key overview)
A
Fungal-migratory bacterium Fungal consumption of fixed N Bacterial consumption of fungal enzyme product is Fungal lysis of bacterium Bacterium lysis of fungus Endofungal bacterium Fungus-bacterium antagonism Bacterium - fungus antagonism
2
Q
E.g.s of neg interactions
A
- some fungi use bac as source of nitrogen. Often lyse them and are attracted to colonies
- some bacteria are mycophages e.g. streptomycetes strains
- non-filamentous bacteria can attach to hyphae and maybe penetrate
- bacterial parasitism of fungus e.g. brown blotch disease of A.Bisporus by p.tolaasii
3
Q
What may fungi-bacteria compete for?
A
- simple carbon compounds
- products of extracellular digestion of lignincellulysis
- fungi for bacterial products
4
Q
Describe mycostasis
A
- most fungal spores fail to germinate = correlated with microbial activity
Alleviated if: - soil sterilised (kills bacteria = less nutrient competition and inhibitory metabolites produced)
- energy sources are added (less competition)
5
Q
Viral infection of fungi
A
Intracellular within fungus
Can be transmitted between hosts via cell-cell contact/fusion
No natural vectors known
Most cause no/few obvious symptoms
6
Q
Negative interactions between fungi and protists
A
- mycophagy
- in rumen
7
Q
E.g. of protist mycophagy
A
- amoeba geococcus vulgaris attaches to walls of fungal spores and sucks out contents
- plasmodia of myxomycetes consume fungi
8
Q
Explain protosome bacteria in rumen
A
Fungi and protosome bacteria enter cow rumen via grass consumption
Bacteria produce zoospores that can swim and are aqueous = feed on fungi
