BIO172W08Lec35CT - Biology 172 L e c t u r e 3 5 - S e n s...

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April 9, 2008 Today s Outline 1. Plants signal transduction 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 Light is life for a plant Phototropism : • Why blue light? • What is the blue- light receptor? 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 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 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 Photodetector that senses far-red light also monitors relative length of day and night • Three categories of flowering
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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 L e c t u r e 3 5 - S e n s...

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