Lecture 20 Intro to Straminipiles

0 %
100 %
Information about Lecture 20 Intro to Straminipiles
Science-Technology

Published on January 12, 2009

Author: aSGuest10215

Source: authorstream.com

Introduction to Kingdom Stramenopila : Introduction to Kingdom Stramenopila Pl P 421/521 Lecture 20 Kingdom Stramenopila : Kingdom Stramenopila Also “Straminipila”, colloquial name ‘stramenopiles’ Includes diatoms, chrysophytes, brown algae and some protozoa Phyla of fungal-like organisms: Hyphochytriomycota Labyrinthulomycota Oomycota Stramenopiles : Stramenopiles Name means “straw hair” and was introduced by D. J. Patterson in 1989 based on tinsel-type flagellum Presence of filamentous thallus in stramenopiles and Fungi is evidence of convergent evolution http://Microscope.mbl.edu Convergent Evolution : Convergent Evolution Evolution of similar features independently in different evolutionary lineages, usually by different developmental pathways Slide 5: http://tolweb.org/tree?group=Eukaryotes&contgroup=Life Eukaryotes--From Tree of Life Project Slide 6: Stramenopiles Mitchell L Sogin and David J. Patterson Phylum Hyphochytriomycota : Phylum Hyphochytriomycota Occur in soil, fresh water and marine habitats Saprotrophs or parasites on algae and fungi Hyperparasites of Oomycete oospores and spores of AM fungi Closely related to Oomycota Characters : Characters Cell walls contain chitin and cellulose Thallus types similar to chytrids Holocarpic or eucarpic (mono- or polycentric) Zoospores with one anteriorly inserted tinsel flagellum Sexual reproduction poorly known 2 families, 6 genera, 23 species Slide 9: Thallus types in hyphochytrids Hyphochytrium catenoides : Hyphochytrium catenoides Eucarpic, polycentric thallus photo by D. J. S. Barr Phylum Labyrinthulomycota : Phylum Labyrinthulomycota Called marine slime molds Parasitic or saprotrophic On marine organisms such as mollusks, aquatic plants or on organic debris Labyrinthula zosterae responsible for wasting disease of eelgrass (Zostera marina) Characteristics : Characteristics Ectoplasmic net produced by bothrosomes (sagenogens) Thallus covered with thin, golgi-derived scales Biflagellate zoospores with long, tinsel flagellum and shorter whiplash flagellum Classification : Classification Two families: Labyrinthulaceae (labyrinthulids) Spindle-shaped trophic cells glide through ectoplasmic net Zoospores have eyespots Thraustochytriaceae (thraustochytrids) Thallus covered with scales, anchored by ectoplasmic net and converted into zoosporangium Zoospores lack eyespots, covered with layer of scales Slide 14: Thraustochytrium Trophic cells surrounded by ectoplasmic net Ectoplasmic net formed from bothrosomes; trophic cells have a single layer of golgi-derived scales Labyrinthula zoospores contain a dark eyespot, but lack surface scales Thraustochytrium thallus wall composed of layered scales formed by golgi apparatus Zoospores lack an eyespot and are surrounded by a single layer of scales Labyrinthula : Labyrinthula http://www.botany.uga.edu/zoosporicfungi/labyrint.htm Ectoplasmic net Labyrinthula trophic cells : Labyrinthula trophic cells http://www.arches.uga.edu/~charla/labies.html bothrosome Eelgrass (Zostera marina) : Eelgrass (Zostera marina) Eelgrass beds are an important component of coastal areas: provide habitat to a diversity of animals Provide food for overwintering waterfowl Provide erosion protection Wasting Disease of Eelgrass : Wasting Disease of Eelgrass Eelgrass populations on both sides of the Atlantic underwent major decline in 1930s Recovery occurred slowly over 40 year period Second decline occurred in 1980s Causal agent identified as Labyrinthula zosterae Rapid Blight Disease in Turf : Rapid Blight Disease in Turf Labyrinthula sp. was isolated from cool season turfgrasses including Poa (bluegrass), Lolium (ryegrass) and Agrostis (bentgrass) in 11 states in U.S. and now also in Scotland First observed in southern CA in 1995 In Arizona, it is associated with high salinity irrigation water http://www.bspp.org.uk/ndr/july2005/2005-41-2.jpg Thraustochytrids : Thraustochytrids Ectoplasmic net and enzymes produced by thraustochytrids can grow into and degrade aquatic plants, mollusk shells, etc. Schizochytrium and Thraustochytrium are used for commercial production of omega-3-fatty acids Slide 22: Making food from water--Invisible but invaluable: raised in steel tanks, a tiny marine creature is capable of producing Omega-3 fat, a product in great demand. http://www.ntnu.no/gemini/2005-01e/food.htm

Add a comment

Related presentations

Related pages

آشنایی با بیماری های گیاهی

Lecture 1 Intro to Mycology ... 20%20yeasts.ppt Lecture 6 Eurotiales ... Lecture 20 Intro to Straminipiles ...
Read more

Introduction to Kingdom Stramenopila

Kingdom Stramenopila 4032604 Lecture 19. Kingdom Stramenopila ... Lecture 19 Intro to Straminipiles Author:
Read more

General Mycology - Department of Plant Pathology ...

Lecture 1 Intro to Mycology ... 20%20yeasts.ppt Lecture 6 Eurotiales ... Lecture 20 Intro to Straminipiles ...
Read more

Powerpoints from a Mycology Lecture Series at WSU ...

Powerpoints from a Mycology Lecture Series at WSU Started ... Lecture 1 Intro to Mycology. ... Lecture 20 Intro to Straminipiles ...
Read more

آشنایی با بیماری های گیاهی

Lecture 1 Intro to Mycology ... 20%20yeasts.ppt Lecture 6 Eurotiales ... Lecture 20 Intro to Straminipiles ...
Read more

Entheo - The Corroboree

Powerpoints from a Mycology Lecture Series at WSU. Entheo posted a topic in Mycology ...
Read more