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CSB Sept 8.docx

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Department
Cell and Systems Biology
Course
CSB353H1
Professor
All Professors
Semester
Fall

Description
CSB452H1FSeptember 9 2013Note the changes to syllabusthere are two exams only one for first half of semesters content one for last half of semesters content NONCUMULATIVEPathogenic lifestyles of microbes and plantsplants and animals have similar commonalities in terms of immune response to pathogens Arms race between the host and the microbe to try to gain the upper hand in the interactionwhen it deems it to be a threatdo not want to be responding to all microbes since it wastes nutrientswant to respond to pathogenic microbes only Plant microbe interactions have dire consequencesaffecting food supply for instancethe potato famine in Ireland in mid1800s Caused emigration to North America In developing countries reduction in major food sources can have devastating effects As world population continues to increase farmers and plant biologists must find more effective ways to grow food whether meat or vegetables What factors are important in outcomes of interactions Can have symbiotic interactions but focusing on pathogenic interactions Agrobacterium tumefaciensthose cells that have DNA injectedgrow tumours due to growth factor injectedbut plant can still survive Biotroph is pathogen that lives on living plant tissue Grapes infected by fungal pathogen botrytisnecrotroph kills off plant tissue lives off dying tissue Enrichment of sugar in these infected grapeslead to delicious wines Pseudomonas syringaeinfects broad range of plants Hemibiotrophboth biotroph and necrotophlives on living tissue then kills off tissue to complete life cycle Symbiotic interactionsrhizobium bacteriafix nitrogen from the atmostphereneed rhizobium for plants to grow How does a microbe persuade a plant that it wants a symbiotic relationship Arabidopsismuch researched Interaction with syringae much researchedfocus of course Pathovarsrestricted in host range Virulence proteins on specific host plants Zigzag model of plant immunityhow it evolvedArms race between plant and microbe Recognition of pathogenassociated molecular patterns Conserved molecules on surface of microbesneed to recognize these patterns in order to detect potentially invading microbe If spray heatinactivated ecoli on plant induce PTIEvolution of pathogen effectors is nextif a microbe wants to be successful at infecting a plant must overcome the shields of plant Broad range of effector molecules What these effectors are doing is blocking PAMP triggered immunity Once PAMP triggered immunity is blockedpathogen can growhave many examples of pathogen effectors that can block PAMP immunityblock first level of basal immunity in plants
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