Plant Pathogens: Definition of Plant Pathology and the Economic Importance of Plant Diseases Flashcards
PLANT PATHOLOGY
From: “pathos” (Greek)= ?
“logos” (Greek) = ?
- suffering
- to study
PLANT PATHOLOGY
has two important components
- as a Science
- as an Art
PLANT PATHOGENS (5)
Oomycetes
Bacteria
Fungi
Nematodes
Viruses
A malfunctioning process that
results in suffering.
Generally harmful/detrimental.
Produces symptoms-histological, morphological abnormalities
Caused by an agent.
Disease
Vital Processes Affected in Plants by Disease
Root absorption
Uptake of water and minerals
Photosynthesis
Respiration
Transport of photosynthates
Reproduction
Importance of Plant Diseases
Plant diseases endanger food supply
Reduce the quantity and quality of plant produce.
Cause financial losses.
Limit the kinds of plants and
industries in an area.
Make plants poisonous to humans
Increase cost of production due to control measures
Milestone in Plant Pathology
_____ (1935) discovered the protein-like nature of the TMV which can be considered as the start of molecular Plant Pathology, two years after, Bawden and Pierie demonstrated that RNA is also present in the TMV but in small quantity.
WM Stanley
Milestone in Plant Pathology
_______ (1956) replicated the experiment and discussed that the infectious entity in the virus is the RNA and not protein and also replicate.
Gierrer & Schramm
Milestone in Plant Pathology
_______ (1941) showed a lock and key concept such that one enzyme is coded by one gene
Beadle & Tatum
Milestone in Plant Pathology
_______ (1942) introduced the concept/hypothesis of Gene for Gene (avr – R)
HH Flor
Milestone in Plant Pathology
_______ (1953) revealed a major discovery in the field of biology that pave the way to understanding the modern biotechnology. They discussed in detailed that DNA occurs in the form of a double helix.
Watson & Crick
Milestone in Plant Pathology
_______ (1942) introduced the concept/hypothesis of Gene for Gene (avr – R)
HH Flor
