Bio 1B Lecture 15 -...

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Guard cells are alive have membrane around outside of GC they can concentrate ions  o when solutes are moved across membrane, causes pressure to  change (because of water movement) pressure called turgor pressure number indicated by this number is positive psi sub p can thus be positive or negative depending on  whether the cell has a membrane solute that is moved across is predominately potassium turgor pressure has another role in plants it is the driving force for cell enlargement and growth  what happens when lose turgor pressure? When pressure increases, puts pressure on cell wall, keeps the cell turgid When withdraw water, (experiment in lab) the membrane inside shrinks and  pulls away from cell wall o Until just touches the cell wall and has no pressure The psi sub p at this point is 0 This condition is known as insipient plasmolysis  o The cell shrinks as well Slides plasmolysis o (a) the cell is turgid
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This note was uploaded on 05/24/2011 for the course BIO 1B taught by Professor Carlson,mischel,power during the Fall '07 term at University of California, Berkeley.

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Bio 1B Lecture 15 -...

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