Named Examples Flashcards
Pseudomonas syringe pv. Tabaci
Bacteria Wild fire in tobacco Water soaked lesions CWDE - pectin enzymes (soft tissue) and tabtoxins (chlorotic halos around the lesions beyond the spread of the bac) Through wounds and flowers
Erwinia amilovora
Fire blight on pears and Apple
Do not produce pectin enzymes, instead Amilovorans
Insect transmission to nectaries and also wounds, stomata etc
Spread intercellularly
Erwinia sp are the only plant path that are facultative anaerobic, require nicotinic acid as a growth factor
Erwinia caratovora
Bacteria Soft rot Massive amounts of CWDE Problem in storages Motile in soil Insect transmission- insect Infected eggs, then larvaes carry the bac in. Inyercellular
Agrobacterium tumefaciens
Galls- hyperplasia and hypertrophy
Ti plasmid
Bacterial chemotaxis
Ralstonia salanucearum
The most destructive path
Very broad host range
Cause potatoe brown rot, bacterial wilt of tomatoes, Moko disease of bananas.
Soil borne, infect via wounds, crackz, root tips
Survive years in wet soil
Amoebal slime mold
Protist Physarum sp Colony and move together Plasmodial movement Under rotting vegetation Spores One mega cell
Plasmodiophora brassicae
Club root of crucifers Tumors- produce oxins Root system stop developing Spors in the soil, unicellular - zoospor Penetrates directly One massive cell - free cell formation To stop treat field with lime (ph <7.2) Jumped hosts in Canada to oil seeds
Oomicetes + example
Heterokont protists Fungi like filaments Cellulose in cell wall Symptoms : damping off (Pythium sp); Leaf blight; Downey mildew; white blister rust Asexual lifecycle/sexual - one race sharing resistance to another. The ex. Zoospores, hyphae grows through roots Pectin enzymes Cold and wet conditions
phytophthora infestans
Potato blight Oomycite Get in through the roots Same lifecycle as Pythium CWDE Prevention disease forecasting - so when it will be wet
Downey mildew
Biotrophic Directly through stomata Hyphae between cells - houstoria Spores out through stomata rupture Worse in wet
Magnaportha grisea
Rice blast disease Ascomycite Spore produce one (sporolating) lesions but one lesion produce millions of spores Problem in monoculture Firts fungi sequenced 2005 Uses chemical cues for host recognition Germ tube Appressorium Gluco proteins - glue itself
Blumeria graminis
Powdry mildew
Biotrophic
No cell death, no brown lessons
Haustoria and appresoria ???
Sticks only on the upper surface, too small to use the gravity, so germ tube on 90 deg from the contact point
Need to hydrate the spore -/ie need water
It has glue
Puccinia hordei
Complex fungi
Finds the stomata by doing through the leaf (down). Only works on monocots
Pucinia graminis
Cereal rust
2 host, 5 spore types, different invasion mechanism
G. Graminis var avenae
Of oats
Example for avenacinase - fungal detoxification
And the example for monoculture verulence over the years
