Biology 20B- May 19

Biology 20B- May 19 - Biology Lecture Auxin to grow-bending...

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May 19, 2009 Biology Lecture Auxin: to grow -bending occurs due to cells on one side elongating -asymmetric distribution of auxin Retribution or Destruction? - Destruction Hypothesis o Tested by Winslow Briggs o Exposed agar of auxin to light o No breakdown of auxin o What about physiological process of breaking down on auxin? - Redistribution Hypothesis o Isolate 2 halves of tip from each other, no transport of hormones o Both halves elicit bending o If not isolated, elicits bending on side not exposed to light o Supports Auxin redistribution hypothesis Auxin - IAA is the natural form of auxin - Derived from Tryp - Produced in apical meristem Plant Orientation Sensory - auxin is produced in tip and moved down stem - acts as a morphogen (reveals orientation) - moves top to bottom Auxin Transport - polar transport- always top bottom - apical dominance- main stem grown the most - suppresses growth of lateral buds - gravitropism in roots - auxin accumulates in response to gravity sensing cells - pools up in bottom of roots - in response to auxin, roots stops growing
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This note was uploaded on 09/15/2009 for the course BIOE 20B taught by Professor Williams during the Spring '09 term at UCSC.

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Biology 20B- May 19 - Biology Lecture Auxin to grow-bending...

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