Download Microbial ecology

Microbial ecology
Figure 21.3
DAPI fluorescent staining for DNA
Live dead stain
Fluorescent antibody
Arabidopsis root and shoot and DEC8D pgfp
FISH
Microbial mat and microelectrodes top cyanobacteria next anaerobic
photosynthetics and heterotrophs
Figure 21.9
Figure 21.17
Figure 21.19A and B
Figure 21.22
Figure 21.23
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
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
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
Figure 21.40 A and B
Figure 21.41
Vertebrate Gut Fermentation
Figure 21.42