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Unformatted text preview: water deficit, serves as a signal for a transduction pathway (that has a Ca ++ secondary messenger) which results in ion (K + especially, but possibly Cl-and malate) movement from the guard cells, closing stomata within minutes. High CO 2 levels detected in guard cells will promote stomatal closure High temperatures also trigger stomatal closure (but may be related to the CO 2 concentrations at higher temperature). Some chemicals, such as ozone, also promote stomatal closure. Plants can respond to long-term water deficit by dropping leaves, reducing transpiration, common in many desert plants. The genetic model plant, Arabidopsis , when grown in high CO 2 concentrations, produces fewer stomata per leaf, validating the observations of the English woodland....
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.
- Fall '09