give me anote on the life cycle of puccinia graminis tritici

The Puccinia is a fungi belonging to class basidiomycetes. Puccinia graminis which infects cereal grains, produces five types of spore during its life cycle- basidiospores, pycniospores (spermatia), aecidiospores, urediniospores (uredospores), and teliospores. It requires two host to complete its life cycle- wheat and barberry. Wheat plant is its primary host and barberry is secondary host.

In the early summer, Uredospores are produced by the infection of aecidiospores on the barberry plant. These spores germinate and spread the disease to the other adjacent plants.

Later in the summer, the same mycelium that gave rise to uredospores, produces teliospores which cause black rust of wheat. These two-celled spores function for survival of the fungus during winter.

With the return of warm weather, the teliospores germinate to form the basidium bearing basidiospores.

Basidiospore (the third stage or spore formed) gives rise to four basidiospores of two different strains- (+) and (-). These spores further form the spermatia and the receptive hyphae which function as the male and female gamete respectively. They fuse forming the dikaryon mycelium.

Further the basal cells of the dikayotised mycelium form chain of aecidiospores. Aecidiospores contain binucleate, unicellular spores. These spores then can burst from the aecidium cups and are capable to infect the barberry plant again.