01:119:116 Lecture 4: 116_4_Fungi

• School: Rutgers University
• Department: Biological Science
• Course: 01:119:116
• Professor: Daniel Stern Cardinale

Document Summary

Secrete hydrolytic enzymes to decompose complex molecules in the environment ncreases surface area for absorption. Cytoplasmic streaming moves absorbed nutrients to the growing hyphal tips. Grows rapidly: i, growth brings organism into contact with new sources of food. Septate: divided into cells by crosswalls called septa. Formed by repeated mitotic divisions without cytokinesis: reproduction. In favorable conditions enormous numbers of spores are produced asexually. Sexual production of spores generally only occurs in limiting conditions for many types of fungi. Sexual union of haploid cells from two individuals. Plasmogamy occurs that produces a dikaryon: when karyogamy occurs, diploid cell immediately undergoes meiosis to reform haploid state. Asexual: mitosis produces air dispersed haploid spores, when introduced to favorable environmental conditions, spores germinate into new mycelia. Unfavorable conditions: sexual, mycelia of opposite mating types produce gametangia containing haploid nuclei. Plasmogamy of gametangia of the opposite mating types produces a dikaryotic zygosporangium.