CSB353H1 Lecture Notes - Lecture 1: Papaya, Cyclic Adenosine Monophosphate, Tobacco Mosaic Virus
28 Apr 2016
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Document Summary
Growing monocultures of genetically uniform crops leads to severe outbreaks of disease. Coat protein gene cloned and inserted in plants. In 1980"s papaya ring spot virus (prsv) nearly wiped out papaya production in hawaii. A gene encoding a viral coat protein was introduced into papaya, making them resistant to virus. Induced (active) defense each plant cell has these defenses (not specialized cells) There are 100"s of thousands of fungi, but less than 2% can cause disease. Necrotrophic kills living cells of host, then feeds on dead matter secret cell wall degrading enzymes, host toxins rotting bacteria and fungi. Biotrophic establishes long term feeding relationship with host, rather than killing host intimate intercellular contact with plant cells fungal mildews and rust viruses. Hemi-biotrophic initial biotrophic phase followed by necrotrophic phase pseudomonas. When spores germinate, develop into hyphae, which join to form fine filaments, the mycelium, a felt- like web of varying density.
