Agents of Disease - Bacteria g
Agents of Disease - Bacteria g
Agents of Disease - Bacteria g
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<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ <strong>Bacteria</strong><br />
Characteristics <strong>of</strong> <strong>Bacteria</strong><br />
• Most plant pathogenic bacteria<br />
are rod shaped<br />
• Produce extracellular<br />
polysacharrides –or“Slime” to<br />
increase virulence<br />
• Mobility is by flagella, or “tail”<br />
• Most are soil inhabitants<br />
surviving on plant debris, but<br />
also in seeds, insects, and freeliving<br />
in the soil<br />
• Spread by wind splashed water<br />
• Spread by wind splashed water,<br />
contaminated tools, vectors, and<br />
contaminated seeds
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ <strong>Bacteria</strong>
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ <strong>Bacteria</strong><br />
<strong>Disease</strong> Cycle <strong>of</strong> Fireblight <strong>of</strong> Pome Fruits (Erwinia amylovora)
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ <strong>Bacteria</strong><br />
<strong>Disease</strong> Cycle <strong>of</strong> Fireblight <strong>of</strong> Pome Fruits (Erwinia amylovora)
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ <strong>Bacteria</strong><br />
<strong>Bacteria</strong>l <strong>Disease</strong>s– Vegetables and Trees<br />
Olive Knot<br />
Crown Gall<br />
Halo Blight <strong>of</strong> Cucumber<br />
<strong>Bacteria</strong>l Spot <strong>of</strong> Melon
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ <strong>Bacteria</strong><br />
<strong>Bacteria</strong>l <strong>Disease</strong>s– Tomatoes<br />
Speck<br />
Pseudomonas syringae pv. tomato
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ <strong>Bacteria</strong><br />
<strong>Bacteria</strong>l <strong>Disease</strong>s– Tomatoes<br />
<strong>Bacteria</strong>l Spot<br />
Xanthomonas campestris
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ <strong>Bacteria</strong><br />
<strong>Bacteria</strong>l <strong>Disease</strong>s– Tomatoes<br />
<strong>Bacteria</strong>l Canker<br />
Clavibacter michiganensis<br />
ihi i
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ Viruses<br />
Characteristics <strong>of</strong> Viruses:<br />
• Nucleoprotein (is it really<br />
living)<br />
• Shortens the life <strong>of</strong> the plant<br />
– A true vampire!<br />
• Multiplies on in the host –<br />
needs cell “machinery” to<br />
reproduce<br />
– Replicates by inserting DNA<br />
into plant’s DNA<br />
• Vary by size, but very, very,<br />
very small<br />
– Not visible by light microscopy<br />
• Not much is known about<br />
viruses that do not cause<br />
disease
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ Viruses<br />
Characteristics <strong>of</strong> Viruses<br />
• Viruses are detected by symptoms<br />
on the plant<br />
– Mottling, mosaics, spots, dwarfing,<br />
striping, leaf rolling, ring spots, and<br />
other weird stuff<br />
• Need a lab to “<strong>of</strong>ficially” diagnose a<br />
virus<br />
• Viruses “go with the flow,” usually<br />
causing systemic infections<br />
• Survive in infected plant material,<br />
vectors, and on surfaces<br />
• Transmitted by insect – fungi –<br />
human – parasitic plant vectors,<br />
ELISA Diagnostic tool for Viruses<br />
root‐grafts, vegetative propagation,<br />
seeds, pollen.
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ Viruses
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ Viruses
<strong>Agents</strong> <strong>of</strong> <strong>Disease</strong> ‐ Viruses<br />
Tomato spotted wilt virus on Pepper<br />
Curly top on tomato<br />
Tomato spotted wilt virus<br />
Tomato spotted wilt virus<br />
Rose Mosaic Virus
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