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Unformatted text preview: PP 315 / 590J Lecture 5 Parasites and pathogens: How they live and die Objectives Understand the steps involved in the development of disease and epidemics while incorporating the predisposition concept. Begin to think about pathogen and parasite survival through the harsh environmental conditions between active growing seasons. Develop an understanding of the nature of parasitism and its differences from pathogens. The nature of parasitism trophic levels and host pathogen interactions How pathogens obtain their food: I. Saprophytic vs parasitic lifestyles FUNGI / BACTERIA Saprophytes Facultative Parasites Obligate Parasites II. Trophic levels (how food is obtained) PARASITIC FUNGI Type of Parasite How Food Obtained Obligate / Facultative Necrotrophic / Hemibiotrophic / Biotrophic saprophyte - lives on dead organic plant matter facultative parasite - an organism that can live as a saprophyte or parasite obligate parasite - an organism that lives only as a parasite (usually implies that it lives only on living cells) necrotroph - an organism that kills tissue prior to utilizing the nutrients...
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- Spring '08