BIOL 206 Chapter Notes - Chapter 37.2: Abscission, Apoplast, Cytosol
Document Summary
Chapter 37. 2: hormones are chemical signals that act at very low concentrations at sites often distant from where they are produced, each plant hormone plays multiple roles, most important cue for a plant is light. For this plants have an abundance of photoreceptors that detect changes in the quality and direction of light as well as the timing of light available. (daylight) Diffusion across a plasma membrane- polar molecules diffuse across plasma membrane less readily than nonpolar molecules. Membrane protein asymmetry- active transport carriers for auxin are located only in the portion of the plasma membrane at the basal/ bottom of the cell. Proton pumping/ chemiosmosis- a proton pump moves h+ from the cytoplasm of the cell wall, therefore increasing the intracellular ph and decreasing ph in cell wall. Proton pumping also sets up an electrochemical gradient which provides potential energy to drive the transport of auxin by carriers.
