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Puccinia graminis
- 1. Puccinia graminis var. tritici, symptoms, host range, taxonomy and life cycle COLLEGE OF AGRICULTURAL TECHNOLOGY (Affiliated to Tamil Nadu Agricultural University, Coimbatore-3) Kullapuram (Po),ViaVaigai Dam, Theni-625 562 STUDENTS SUVETHA S DEEPAN S COURSE TEACHER Dr. PARTHASARATHY.S Asst. Professor (Plant Pathology)
- 2. HISTORY: • The fungal ancestors of stem rust have infected grasses for millions of years and wheat crops for as long as they been grown. • The ancient Romans created the Rust God “Robigus”, Goddess “Robigo” and sacrificed red coloured animals such as dogs, foxes, and cows during the festival called the Robigalia to appease the god, hoping to prevent destruction of Wheat crops.
- 4. DISEASE NAME: Wheat stem rust PATHOGEN NAME: Puccinia graminis var. tritici HOST PLANT: Wheat, Barberry
- 5. SYSTEMATIC POSITION Kingdom : Fungi Phylum : Basidiomycota Subphylum : Pucciniomycotina Class : Pucciniomycetes Order : Pucciniales Family : Pucciniaceae Genus : Puccinia Species : graminis
- 6. SYMPTOMS: • Reddish brown rust pustules (Uredia) are noticed mainly on the stem than leaf sheaths and leaves. • At maturity a mixture of brown and black lesions (Telia) are seen.
- 7. SYMPTOM In wheat © fao. org
- 8. In Barberry © Plant Science 4 U
- 9. Pathogen: • It is obligate parasite. • Puccinia graminis is heterocious. • It is polycyclic, pathogen produce five kinds of spores. • Urediospores and teliospores on Wheat. • Basidiospores from the teliospores found on the infected fallen leaves in the soil. • Pycniospores and aeciospores on Barberry.
- 10. STAGES OF LIFE CYCLE: Stage 0: Spermogonium, produces spermatia and receptive hyphae. Stage 1: Aecium produce aeciospores. Stage 2: Uredium produce urediospores. Stage 3: Telium produce teliospores. Stage 4: Basidium produce basidiospores.
- 11. Urediospores: Oval, single celled, binucleate, golden brown, pedicillate (repeating spores). Teliospores: Two celled, dark brown, thick walled apex pointed at tip (resting spores). Basidiospores: Unicellular, round and uninucleate. Pycniospores: Spherical, thin walled, hyaline, unicellular, uninucleate. Aeciospores: Unicellular, yellow, thick walled, binucleate.