BIO172W08Lec35CT - Biology 172 Lecture 35 - Sensory...

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April 9, 2008 Today’s Outline 1. Plants Photoreceptors & signal transduction Mechanosensors & electrical signaling 2. Animals Sensory transduction Hearing Vision Announcements Reading: Ch.38 (pp.871-882, omit gravity perception ) Ch.46 (pp.1052- 1056, 1059-1063 ) Biology 172
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Light is life for a plant Phototropism : Why blue light? What is the blue- light receptor?
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PHOT1 is a blue light receptor Null mutation in Arabidopsis phot1 gene >> no phototropic response to blue light PHOT1 is a membrane protein kinase that is autophosphorylated in response to blue light Double null mutations in phot1 and phot2 >> guard cells cannot open pores of stomata Phot* phosphorylates H + -ATPase
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Where would you expect to find PHOT proteins? A) Cells surrounding the apical meristem B) Guard cells of stomata C) Stems of growing shoots D) A and B E) A, B and C
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What about red light? Far-red wavelengths pass through leaves >> shade on the forest floor >> competitors Far-red light >> plants grow tall and spindly = stem elongation Far-red
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Photodetector that senses far-red light also monitors relative length of day and night Three categories of flowering responses to photoperiod Plants monitor the length of the night = period without light
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This note was uploaded on 12/06/2009 for the course BIO 172 taught by Professor Clark during the Spring '08 term at University of Michigan.

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BIO172W08Lec35CT - Biology 172 Lecture 35 - Sensory...

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