Class Tutorial B.Sc(Botany)Part-I Life cycle of Peziza

Dr. Devanand kumar Department of Botany B.N college, Patna University, Patna Life cycle of Peziza ➢Systemic Position-

▪ Kingdom-Mycota ▪ Division-Eumycota ▪ Class-Discomycetes ▪ Order- ▪ Family- ▪ -Peziza Life cycle of Peziza ➢Habit and Habitat-

▪ The genus contains more than 100 species. ▪ Produces characteristic cup shaped fruiting body called apothecia above substratum. ▪ Thus, the is often called ‘cup fungus’. ▪ Grow saprophytically during rainy season on animal dung, well manured soil and ground rich in humus, on decaying wood. Life cycle of Peziza ➢Vegetative body-

▪ Vegetative body is mycelium consisting extensively developed much branched septate hyphae. ▪ Hyphal cells are short multinucleate or uninucleate. ▪ Develop inside the substratum forming a complex network. ▪ The cup shaped fruiting bodies are above ground. Life cycle of Peziza ➢Asexual reproduction- ▪ Asexual reproduction takes place by conidia and chlamydospores. ▪ Conidia are exogenously formed spores abstricted from tips of conidiophores. ▪ Each conidium germinate to form a new mycelium. ▪ Chlamydospores are thick walled produced singly or in series in hyphal cells, and germinate to form a new mycelium under suitable condition. Life cycle of Peziza Life cycle of Peziza ➢Sexual reproduction- ▪ The sex organs are wholly lacking in Peziza. ▪ This does not stop the development of fruitification. ▪ The sexual process does take place by the association of two vegetative nuclei in pair of the hyphal cells of the mycelium. ▪ Thse pair of nuclei are called dikaryons brought about either by autogamous pairing or by somatogamous copulation between the vegetative cells of the adjecent hyphae Life cycle of Peziza ▪ The cells with the dikaryons give rise to ascogenous hyphae which become multicellular by cross walls. ▪ The terminal binucleate of each ascogenous hyphae function as an ascus mother cell. ▪ The two nuclei of ascous mother cell fuses to form synkaryon. ▪ The synkaryon undergoes three succesive nuclear divison resulting in the formation of eight haploid nuclei which become organised into ascospores which germinate directly to produce new mycelium. Life cycle of Peziza • The asci grow errect and lie side by side parallel to each other often intermingled with sterile hyphae called paraphyses. • The layer of asci and paraphyses is called hymenium. References • www.slm.ignou.com/biology • www.biologydiscussion.com/fungi