BTNY 301 Week 11 & 12

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Author:
Anonymous
ID:
212003
Filename:
BTNY 301 Week 11 & 12
Updated:
2013-04-07 16:44:59
Tags:
lecture 17 18
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Description:
virus, viroids, plant defence
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  1. Mycoviruses
    • infect fungi
    • affect virulence of fungal pathogens
    • transmitted- through cell division, sporogenesis & cell fusion
    • e.g. CHV1 Hypovirus
  2. CHV1 Hypovirus
    • infects chryponectria parasitica, which causes chestnut blight
    • Causes pigmentation suppression
    • sever suppression of conidiation
    • virulence attenuation
    • Infected strains don't compete well with WT
    • Genome: dsRNA no true particle
  3. Chestnut blight
    • fungus gets in bark and can girdles twigs/stems
    • Symptoms: Stem canker & death
    • Signs: orange Conidia & ascoposres
  4. Viroids
    • plant pathogens
    • 1/10th size of virus
    • No information for proteins just RNA
    • Circular RNA rod shaped
    • look like virus symptoms
    • Overwinter in perennial hosts
  5. Potato spindle tuber viroid (dPSTV)
    • Viroid
    • Spindle-shaped paotato
    • Stiff upward growth habit
  6. Citrus exocortis virod
    • stem pitting on sour orange root stock
    • stunted tree on trifoliate orange rootstock
    • chlorosis & stunting
  7. Satellite RNAs
    • RNA that need 'helper' virus to create protein coat
    • can exist on plant w/o helper
    • can make symptoms of 'helper' more severe
    • decrease in accumulation of the helper virus
    • considered for control of plant viruses
    • e.g. CMV satellite RNA dependent on CMV for replicaiton
  8. Nematode Life cycle
  9. Control of nematodes
    • nematicides are available but expensive
    • crop rotate
    • Fungi rings and sticky nobs
  10. Lesion Nematode
    • Symptoms: lesions on roots, stunted and chlorotic plants, wilted, secondary infections
    • Signs: nematodes .4-.7 mm
    • Hosts: Very wide range
    • Environment: worldwide
    • Management: nematicides, rotation, control weeds, plant crop in infested field
  11. Root Knot Nematode
    • Symptoms: Galls & bushy roots, necrotic small roots, reduce growth, small cholortic, wilted
    • Signs: 1.2-1.5 mm males & smaller pear shaped females
    • Hosts: Wide
    • Environment: Warm climates, 5-25 cm soil
    • Management: resistant varieties, fumagation, rotation, plant in nematode free fields
  12. Dodder
    • Symptoms: host plant vigor down, possible death
    • Signs: orange/yellow viens
    • Hosts: legumes & broadleaved plants
    • Environment: most
    • Management: Some resistant crops, clean equipment, dodder-free seed, contact herbicide, plant where seeds are not.
  13. Mistletoe
    • Symptoms: swelling & cankers near twigs
    • Signs: shoots, small leaves, flowers
    • Hosts: Dwarf on conifers & True/leafy on hardwoods
    • Environment: where trees are
    • Management: Remove by pruning & culling trees

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