Systematic position and life cycle of puccinia

Systematic position and life cycle of Puccinia

1. Systematic position and life cycle of Puccinia Sankrita Gaonkar Assistant Professor in Botany [email protected]

2. Contents Systematic position of Puccinia Life cycle of Puccinia References

3. Puccinia Systematic position: Class: Basidiomycetes Order: Pucciniales Family: Pucciniaceae Genus: Puccinia Features: Genus Puccinia consists of more than 4000 different species all of which are plant pathogens . These are known to cause rusts in both monocotyledons and dicotyledons. Major pathogen, P. graminis (Stem rust) affects cereal crops such as wheat, barley etc.

4. Puccinia graminis It is an obligate parasite of wheat causing stem rust disease. Its life cycle consists of two hosts namely, Wheat – Primary host Barberry – Secondary host Stem rust affects parts of plants that are above ground. In wheat it results in formation of brown to black elongated pustules . In barberry it forms flask shaped pycnia at dorsal and aecia on ventral side Infection of P. graminis results in retarded growth and reduced seed size in wheat.

5. 5 types of spores in life cycle of Puccinia graminis : Pycnidiospores or Spermatia (uninucleate) – spermagonia Aecidiospores (binucleate) – aecidia Uredospores (binucleate) – on dikaryotic mycelium Teleutospores or teliospores (binucleate) – on dikaryotic mycelium Basidiospores (uninucleate) – basidia

6. Life cycle of Puccinia graminis

7. References https://www.cusb.ac.in/images/cusb-files/2020/el/lsc/amt/Puccinia.pdf Vashishta B.R., Sinha A.K. and Singh V.P. 2012. Botany for degree students: Algae. S. Chand & company ltd.