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BIOL 260 (12)
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water ion balance in plants.docx

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Department
Biology
Course
BIOL 260
Professor
Philippe Tortell
Semester
Winter

Description
Chapter37WaterandSugartransportinPlants371WatermovementandwaterpotentialLossofwaterviaevaporationfromtheaerialpartsofaplantiscalledtranspirationTranspirationoccurswheneverstomataareopenduringphotosynthesisOrwhentheairsurroundingtheleavesisdrierthantheairinsidetheleavesatmosphereisat100humidityWaterisabsorbedfromtherootspassivelytotheleaveswithouttheuseofATPPlantsdontneedheartmusclepumpingtomovewaterfromrootstoshootsMovementoccursbecauseofdifferencesinpotentialenergyofwaterWaterPotentialIndicatesthepotentialenergythatwaterhasinparticularenvironmentcomparedwiththepotentialenergyofpurewateratroomtemperatureandatmosphericpressureUndertheseconditionswaterhasapotentialofzeroDifferencesinwaterpotentialdeterminethedirectionthatwatermovesWateralwaysflowsfromhighwaterpotentialtolowwaterpotentialWPisusuallyhighinsoilandrootsbutlowinleavesandtheatmosphereThereisaWPgradientacrosstherootsandshootsTomoveUPtheplantwatermustmoveDOWNitsgradientWhatFactorsEffectWaterPotentialRecallthatsoluteconcentrationsinthecellandsurroundingtiss
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