MICR 3220 Lecture 12: MICR – lecture 12

• School: University of Guelph
• Department: Microbiology
• Course: MICR 3220
• Professor: Paul Goodwin

Document Summary

Penetration entry through intact surfaces through: wounds, various sources of wounds (viruses only enter through wounds) natural openings (how bacteria and fungi enter) Stomata water exchange, gas exchange (uptake of. Hydathodes (modified stomates, on edge of leaf, where they can release that solution guttation fluid: when it sucks the fluid up again it sucks bacteria up at the same time, no different for fungi. Once we have penetration the next stage is infection: defined as occurring when our parasite now obtains nutrients from the plant. Nutritional relationship between parasite and plant if there is a nutritional relationship our parasite can grow and multiply. When we have infection we get biotrophs whose nutritional relationship is with living host cells, and the necrotrophs whose relationship is with cells in which is has killed. During this infection we start to see the development of symptoms (visible evidence that pathogen is causing damage don"t necessarily occur immediately)