Biology 4218A Study Guide - Final Guide: Parasitoid, Fire Blight, Plum Pox

• School: Western University
• Department: Biology
• Course: Biology 4218A
• Professor: Graeme Taylor

Document Summary

Gardiner lecture 1 invasion by fungi. Chlamadospores asexual spores originating endogenously (mitosporangic fungi) Conidia haploid thick or thin walled (also asexual) Three entry routes for plant pathogens: wounds e. g. tmv, agrobacterium, soft rot fungi, natural openings. Via lenticels, stomata e. g. rust fungi, pseudomonas. Through natural cracks between main and latheral roots. Fungus kills and macerates cells ahead of its advance. Through hydothodes ( holes that cause guttation water droplets on surface of leaves) * fungi especially are capable of using direct penetration. When fungal spores germinate, they develop into microscopical, cylindric, elongated structures with cross walls; the hyphae (singular: hypha) In most cases the hypae join up and form very fine filaments, the mycelium, a kind of felt-like web of varying density. Hyphae are distributed within the substrate e. g. soil, organic litter of wood, and are able to extract nutrients and carbohydrates from this substrate. The initial interaction between fungal pathogen & plant when spore lands on plant surface.