Fungal Lecture3

Information about Fungal Lecture3

Published on January 8, 2008

Author: Rinald

Source: authorstream.com

Content

Filamentous fungi - review and Oomycetes:  Filamentous fungi - review and Oomycetes Lecture 3 Four phyla of fungi:  Four phyla of fungi Chytridiomycota - no sexual spore Zygomycota - zygospore Ascomycota - ascospore Basidiomycota - basidiospore Ascomycota:  Ascomycota Botrytis cinerea - a fungus -causes grey mold:  Botrytis cinerea - a fungus -causes grey mold Powdery mildew of cucumber:  Powdery mildew of cucumber Eye spot disease of strawberry Ramularia grevilleana, Mycosphaerella fragariae:  Eye spot disease of strawberry Ramularia grevilleana, Mycosphaerella fragariae Canker, Nectria galligena:  Canker, Nectria galligena Wilts caused by Fusarium oxysporum:  Wilts caused by Fusarium oxysporum Wilt of field grown melon caused by F. ox. formae speciales melonis Darkened vascular tissue of cucumber caused by F. ox. f.sp. cucumerinum Characteristics of Basidiomycota:  Characteristics of Basidiomycota Mycelium is septate Septa are perforated - sometimes with dolipore (doughnut shaped) Basidiomycetes have clamp connections:  Basidiomycetes have clamp connections Fly agaric (flugsvamp):  Fly agaric (flugsvamp) Stem rust of wheat:  Stem rust of wheat Aecia on barberry:  Aecia on barberry Rust of raspberry:  Rust of raspberry Rust of rose:  Rust of rose Rhizoctonia solani:  Rhizoctonia solani It is a basidiomycete; teliomorph (Thanatephorus cucumeris) is rare. Has very characteristic mycelium; typical of basidiomycete. Differentiated into anastomosis groups (AG) (fusion of hyphae only occur if same anastomosis group) Corn smut:  Corn smut Corn smut:  Corn smut Corn smut:  Corn smut The disease cycle of corn smut:  The disease cycle of corn smut Oomycota:  Oomycota They are very different from true fungi: Cell walls have cellulose and glucans. Hyphae have no cross walls (septae). Spore types: Oospore = resting spore, sexual spore Zoospores, zoosporangia = asexual spores Examples: Pythium -seed rot, damping off, root rot Bremia, Peronospora, Plasmopara - downy mildews Oomycetes belong to Chromista:  Oomycetes belong to Chromista Different types of diseases caused by Oomycetes:  Different types of diseases caused by Oomycetes Late blight of potato, caused by Phytophthora infestans:  Late blight of potato, caused by Phytophthora infestans The disease cycle of potato late blight (Phytophthora infestans):  The disease cycle of potato late blight (Phytophthora infestans) Mature sporangium:  Mature sporangium There are 8-10 zoospores per sporangium:  There are 8-10 zoospores per sporangium Zoospores are released:  Zoospores are released One zoospore left…:  One zoospore left… Zoospores germinate:  Zoospores germinate See movie of zoospore release:  See movie of zoospore release Grass lawn attacked by Pythium ultimum (damping off):  Grass lawn attacked by Pythium ultimum (damping off) Life cycle of Pythium ultimum:  Life cycle of Pythium ultimum Downy mildew of grape:  Downy mildew of grape Attack of grape berries:  Attack of grape berries Symptoms of grape downy mildew (Plasmopara viticola):  Symptoms of grape downy mildew (Plasmopara viticola) Disease cycle of Plasmopara viticola, downy mildew of grape:  Disease cycle of Plasmopara viticola, downy mildew of grape Zoospores of downy mildew of hop, landing on leaf and infecting:  Zoospores of downy mildew of hop, landing on leaf and infecting Downy mildew of onion (Peronospora destructor):  Downy mildew of onion (Peronospora destructor) Downy mildew of cabbage (Peronospora parasitica):  Downy mildew of cabbage (Peronospora parasitica) Tree and strawberry diseases caused by Phytophthora species:  Tree and strawberry diseases caused by Phytophthora species Strawberry crown rot, caused by Phytophthora cactorum:  Strawberry crown rot, caused by Phytophthora cactorum Oospore and sporangia Slide44:  Alnus glutinosa attacked by Alder Phytophthora Brownish red discolouration Oogonia Amphigyne two-celled antheridia Oospore Photo: Christer Olsson Alder stembase Symptoms of Phytophthora alni ssp. uniformis on alder (Alnus glutinosa):  Symptoms of Phytophthora alni ssp. uniformis on alder (Alnus glutinosa) The pathogen infects through wounds at the stembase or through the roots. The tree tops die The tree dies later Slide46:  Phytophthora ramorum, chlamydospores. (Diameter 20 – 90 µm, 52.5 – 75 µm on this slide). Often germinating with a sporangiophore. Isolat CH 180, (CBS 101328; P1357), The Netherlands, Rhododendron. Heterothallic (A1). Christer Olsson, 1/7 2002, DIA bilder

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