Puccinia fungus

Puccinia fungus - CLASSIFICATION: Kingdom: Mycota Division:...

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Unformatted text preview: CLASSIFICATION: Kingdom: Mycota Division: Eumycota Subdivision: Subdivision: Basidiomycotina Basidiomycotina Class: Teliomycetes Order: Uredinales Family: Pucciniaceae Genus: Puccinia Species : graminis Species INTRODUCTION: INTRODUCTION: The genus includes about 3000 The species of these 147 has been reported from India. reported It causes a rust disease - black It stem rust of Wheat. stem Puccinia graminis is an obligate parasite. parasite. It is a heterocious parasite. It It’s life cycle on Wheat and on It’s Barberry. Wheat is a primary host. Barberry Barberry is a secondary or alternate host. alternate Spore-producing stages (0, I, II, Spore-producing III, IV) in their life cycles. III, Puccinia graminis 0 and I on barberry bushes (Berberis barberry Berberis vulgaris: dicot) II and III on various grasses II (monocot) (monocot) IV on soil. Acediospores geminates on Wheat stem or leaf to form binucleate, dikaryotic filamentous well developed, branched, intercellular mycelium. mycelium. Dikaryophase Reproduction: Dikaryophase On Wheat Puccinia reproduces by Puccinia (Asexual) sporulation. The spores are of two kinds: The (i) Uridiospores (2N) Uridiospores Uridosporangium (ii) Telutospores (2N) (ii) Telutosporangium (iii) Basidio spores Each cell contains a pair Each of nuclei (n + n) constituting a dikaryon. constituting To obtain nutrition To haplophase phase develop haustoria. haustoria. Uredineal Stage: Uredineal The hyphae of the dikaryotic The mycelium - aggregate near the surface of the infected organ to form a hyphal mass known as Ureida. known The tip of each hyphae swells to The form a single binucleate oval uredospore formed in a group. uredinium or uredosorus. uredinium They exert pressure on the They epidermis, finally ruptured in form of slits through which rusty coloured Uredospores are seen. coloured Uredospore Mycelium Puccinia Uredosporangium Puccinia Uredosporangium -Wheat Uredospore are stalked, unicellular oval, binucleate structures, rusty red in colour. Telial Stage: Telial Late in growing season, Late Uredospores are metamorphoses into Telutospores in the same Uredosori. Uredosori. Uredosori is known as Telutosori. Telutospores are dark brown or Telutospores black in colour. black Stage III: Telia bearing teliospores (n+n>2n) teliospores Puccinia Teluto Puccinia sporangium sporangium Telutospores Telutospores Dark brown or black in colour. stalked, two celled, spindle shaped. shaped. The wall is thick, The black and smooth. smooth. Puccinia teluto spores spores •Each cell has two nuclei (one plus strain and the other of minus strain). •final stage on primary host •Telutospore matures, the nuclei in each cell fuse to form a diploid nucleus (Kayogamy) (2N). Germination of Teluto spore Germination On Soil Favourable condition- Proper Favourable Temperature, Moisture Temperature, Germination of Teluto sporeGermination germination tube - Epibasidium Germination of Teliospore Germination Germination tube Germinated Teluto spore and formation of Basidium & Basidio spores of Sterigmata Basidio spore (+) Or (-) Epibasidium Hypobasidium Basidium Basidiospores Basidiospores (+ and -) Basidiospores germinate on upper epidermis of Barberry leaf and produce Pycniosporangium Stages of Puccinia on Barberry leaf Barberry Pycniospores stage: On upper epidermis with +ve and – ve basidiospores (Sexual reproduction) (Plasmogamy) (Plasmogamy) Aecidiospore stage: On lower On epidermis, Binucleate Aecidiospore epidermis, Infection of Puccinia on Barberry Puccinia leaf Lower and Upper sides leaf Puccinia Pycnium on Upper Puccinia epidermis epidermis Receptive hyphae and Spermatia Receptive Spermatia Receptive hyphae DevelopDevelopment of ment Aecidiosp Aecidiosp orangium Stage I: Aecia bearing Stage aeciospores (n+n) •Puccinia- Aecio sporangium on lower Aecio epidermis aeciospores infect primary host. epidermis aeciospores Aeciospores produced on alternate host Aeciospores (e.g.,Barberry) infect primary host (e.g., grasses) grasses) AeciosporesAeciosporesround, yellowish red, Unicellular, binucleate, thick walled, 6 germ pores. pores. Germinate on Germinate wheat plant. wheat Aecidiosporangium Aeciospores Puccinia- Polymorphic fungi fungi Polymorphism: Various types of Polymorphism: spores produced during life cycle according to hosts life cycle and climatic condition. climatic Known as Polymorphism. Fungi shows polymorphism known Fungi as Polymorphic fungi. as Puccinia Life Cycle Puccinia life cycle Puccinia Life Cycle This powerpoint was kindly donated to www.worldofteaching.com http://www.worldofteaching.com Is home to well over a thousand powerpoints submitted by teachers. This a free site. Please visit and I hope it will help in your teaching ...
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This note was uploaded on 11/23/2011 for the course BIO 100 taught by Professor Robinson during the Fall '08 term at BYU.

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