Lecture 34 notes W11

Lecture 34 notes W11 - Lecture 34 (4-8-11) Notes I....

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Lecture 34 (4-8-11) Notes I. Chemical signaling in plants A. Cells sense a stimulus and produce a hormone B. Hormone travels to effector cells, altering their behavior in a way that allows the plant to respond to the stimulus in an advantageous manner. II. Response to blue light A. Blue light is the wavelength where Chlorophyll a and b have maximal absorption. 1. Not surprisingly, it is blue light that is responsible for the well known property of plants bending towards the light. B. In PHOT1 mutants, seedlings don’t bend towards blue light. 1. The PHOT1 protein is a cell surface transmembrane protein that is phosphorylated in response to light. C. Is PHOT1 a direct blue light sensor? 1. Transfect the PHOT1 gene into insect cells (that are not light responsive). 2. Expose these cells to light. 3. PHOT1 is phosphorylated in a light-dependent manner. 4. PHOT1 protein can absorb blue light and auto-phosphorylate itself. 5. The phosphorylated PHOT1 sends a signal that induces plant bending. D. Covering the tip of the seedling inhibits its ability to bend towards light. 1. The light-sensing cells are in the tip of the shoot.
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This note was uploaded on 02/13/2012 for the course BIO 172 taught by Professor Clark during the Winter '08 term at University of Michigan.

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Lecture 34 notes W11 - Lecture 34 (4-8-11) Notes I....

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