transport processes in plants€¦ · the movement of water & minerals transpiration definition...

Transport Processes in Plants

Two important transports in plants

Introduction

The Movement of Water & Minerals

Transpirationdefinitiondifference between plants & animalsreason for transpiration

The Movement of Water & Minerals

Water uptakesoil waterroot pressureguttationonly accounts for 10 m

The Movement of Water & Minerals

Cohesion-Tension Theory

mechanism

reason for name

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Factors Influencing Transpiration

Name 4

loses most water

Stomatal MovementTurgidity

effect on guard cells

reasons

water movement and solute

K+ as critical solute

H20, Cl-, H+

Stomatal Movement

Energy sourcesATP production ORchemiosmosis

Stomatal MovementOther factors

Availability of waterAbscic acidCO2 concentrationtemperature

Stomatal Movement

Lightopen - day; closed - night

Explanations

Stomatal Movement

Crassulacean Acid Metabolism

The Uptake of Minerals

minerals (definition)how are they taken uprole of endodermisactive transport & mineral uptake

The Movement of Sugar

Translocationdifficult to studysieve-tube sap containsmovement of sap (timing)

The Pressure-Flow Hypothesis

Movement by translocation is source-to-sink patternSourceSink

Pressure-flow hypothesis accounts for translocation by a source-to-sink pattern

Solutes move in solutions...

Sugars move from leaf...

At source

Sugar

Water

Movements in Sieve Tubes

Movements in Sieve Tubes

At sinks

Water & sugar

Fate of sugar

Fate of water

Movements in Sieve Tubes

Movement in sieve tubesRole of mitochondriaPassivehttp://highered.mcgraw-hill.com/sites/9834092339/student_view0/chapter38/animation_-_phloem_loading.html

Factors Influencing Plant Nutrition

Mineral uptake by roots depends on

availabilitysymbiotic relationships

Components of Soil

Mineral componentsdetermined by

Soil particles size

Availability of Minerals

calciumiron

The Role of SymbiosisMycorrhizae

whatrole of funginitrogen availability - asrole of nitrogen

Nitrogen Fixation

organismsexampleimportance