Microbial ecology
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Transcript of Microbial ecology
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Microbial ecology
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Figure 21.3
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DAPI fluorescent staining for DNA
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Live dead stain
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Fluorescent antibody
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Arabidopsis root and shoot and DEC8D pgfp
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FISH
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Microbial mat and microelectrodes top cyanobacteria next anaerobic photosynthetics and heterotrophs
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Figure 21.9
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Figure 21.17
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Figure 21.19A and B
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Figure 21.22 Figure 21.23
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Microbes Associated with Roots• The environment surrounding a plant root can be
further subdivided into two categories:
- Rhizoplane: The plant root surface- Rhizosphere: The region of soil outside the rhizoplane that receives substances from the root
Particular microbial species are adapted to these environments.
Figure 21.27
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Microbial Communities within Plants• Endophytes are bacteria or fungi that colonize the
transport vessels of plants.• - Produce alkaloids and enzymes that deter
plant pathogens and root-feeding nematodes
Endophytic pathogens pose a problem for the food industry because the bacteria cannot be “washed off” from raw produce.
Figure 21.31
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Wetland Soils• A wetland is a region of land that undergoes seasonal
fluctuations in water level.• - Dry and oxygenated vs. water-saturated and anaerobic
Many kinds of anaerobic bacteria inhabit wetlands.- Denitrifiers- Fermenters
The anoxic conditions of wetlands also favor methanogenesis.
Figure 21.30
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Figure 21.40 A and B
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Figure 21.41
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Vertebrate Gut Fermentation
Figure 21.42
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