Puccinia ppt
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Puccinia is a genus of fungi that includes approximately 5000 species, some of which are devastating pathogens of wheat and other cereals. Puccinia graminis causes stem rust in wheat, P. recondita causes brown leaf rust, and P. striformis causes yellow stripe rust. These rusts have polymorphic life cycles with multiple spore stages. Symptoms vary by species but generally include blisters or pustules that erupt and release spores, which can be brick red in stem rust and cause stems and leaves to blacken. Brown leaf rust first appears on upper leaves while yellow stripe rust primarily affects leaves. In barberry shrubs, rust symptoms appear as yellow to orange spots on leaves.
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Puccinia ppt
- 1. PUCCINIA PRESENTED BY: DIBYA THAPA MAGAR (17) DINESH GHIMIRE (18) GAJENDRA BHATTA (19)
- 2. SYSTEMATIC POSITION: Kingdom: Mycota Division: Eumycota Subdivision: Basidiomycotina Class: Teliomycetes Order: Uredinales Family: Pucciniaceae Genus: Puccinia Species : graminis
- 3. INTRODUCTION: The genus includes about 5000 species. Some species are autoecious(single host) whereas some are heteroecious. Mainly 3 species are found to be devastating wheat and other cereals field through rust: Puccinia graminis – Stem rust in wheat P. recondita –Brown leaf rust P. striformis - Yellow stripe rust Rust are polymorphic, it means several forms of spores exist in its life cycle. (Fig. 1)
- 4. Fig.1. Various stages of Puccinia
- 5. SYMPTOMS: Black stem rust: Appear as elliptical blisters/pustules called uredia(Fig.2) Infected parts burst out exposing mass of brick-red colored urediospores.(Fig.3) Later on, the blisters turn black as fungus produces teliospores. Uredia are transformed into black telia.
- 7. FIG.3. T.S. of affected leaf of wheat showing uredospores
- 8. Brown leaf rust: First seen on upper leaves. Yellow stripe rust: Appear mainly on leaves than leaf sheath and stem. In Barberry, the symptoms appear as yellowish to orange colored spots on leaves.(Fig.4.)
- 9. Fig.4. Leaf rust in barberries sps.
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