Presentation 06 - Cellular and Plant Transport

We’ll be discussing ,[object Object],[object Object],[object Object],[object Object],[object Object]

Membranes and cellular transport

Summary of Transport Processes Diffusion Osmosis Facilitated Diffusion Pumps Endocytosis/exocytosis Direction High to Low High to Low High to Low Low to High N/A Transport Mechanism Pores Pores Channels Pumps Membrane Energy Required? No No No Yes Yes Type of particle Small, nonpolar Water Small-medium Ions Small-large Examples of particles CO 2 , O 2 H 2 O Glucose, fructose, Na + , Ca +2 Na + , K + , H + Food, waste

Transport within the eukaryotic cell ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

VASCULAR TISSUES: XYLEM AND PHLOEM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

OVERVIEW OF TRANSPORT IN A VASCULAR PLANT

CELLULAR LEVEL TRANSPORT ,[object Object]

SHORT-DISTANCE H 2 O TRANSPORT IN THE ROOT

WATER AND MINERALS ASCEND THROUGH THE XYLEM ROOT PRESSURE TRANSPIRATION–COHESION–TENSION THEORY Tension – negative pressure

STOMATA HELP REGULATE THE RATE OF TRANSPIRATION ,[object Object],[object Object],[object Object],Turgid Flaccid Lower epidermal tissue Trichomes (“hairs”) Cuticle Upper epidermal tissue Stomata 100  m

ORGANIC NUTRIENTS ARE TRANSLOCATED THROUGH THE PHLOEM (PRESSURE – FLOW MODEL) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Vessel (xylem) H 2 O H 2 O Sieve tube (phloem) Source cell (leaf) Sucrose H 2 O Sink cell (storage root) 1 Sucrose Loading of sugar (green dots) into the sieve tube at the source reduces water potential inside the sieve-tube members. This causes the tube to take up water by osmosis. 2 4 3 1 2 This uptake of water generates a positive pressure that forces the sap to flow along the tube. The pressure is relieved by the unloading of sugar and the consequent loss of water from the tube at the sink. 3 4 In the case of leaf-to-root translocation, xylem recycles water from sink to source. Transpiration stream Pressure flow

Presentation 06 - Cellular and Plant Transport

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Presentation 06 - Cellular and Plant Transport