BIOL 123 Lecture Notes - Lecture 19: Mycelium, Cytoplasmic Streaming, Osmosis
Document Summary
Densely packed hyphae that have undergone sexual mating process during which unmated hyphae of different, but compatible, mycelia are attracted to each other and fuse. Resulting mated hyphae differe genetically and biochemitcally fom unmated. Osmosis and cytoplasmic streaming are important for it. Osmosis diffusion of water through membrane, from solution with low solute conc to higher. Water enters hyphae through osmosis because cytoplasm is rich ins sugars,ions, and other soutes. Water swells hyphal tip providing force for tip extension. Masses of tiny vesicles carrying enxyme and cell wall materials collect in tip and vesicles fuse with membrane. Some vesicles release enzymes to digest food absorbed from environemtn. Others deliver cell wall materials to tip ofr extension. Hyphae growth rapidly from food depleted areas to food rich areas. In nature mycelia take up irregular shape depeding na food substrate. In liquid mycelium grow in a spherical nature like a cotton ball. In solid plate - grow more 2d nature.
