Water and sugar transport & PLANt hormones

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Presentation transcript:

Water and sugar transport & PLANt hormones

OSMOSIS Which way would the water molecules (red dots) be moving?

Roots SEM of Marjoram Root Mycorrhizae (fungi) interaction with plant Mycorrhizae are fundamental to plant establishment, supplying the water and nutrients needed for survival and, in exchange, receiving essential sugars and other compounds supplied by the plant. Mag 100X What is the significance of increased surface area of the roots of a plants?

How do plants absorb and transport water? 2 methods Root pressure Smaller effect Usually occurs at night “push” force Transpiration-Pull Larger effect Usually occurs during the day “pull” force

Root Pressure

Root Pressure Casparian Strip ______________________________________________________ regulates water and solutes entering xylem by forcing the “sap” to pass through cytoplasm of cells

Xylem Sap Maple syrup = reduced sugar maple xylem sap Collected early spring Only time of year where xylem transports sugar to leaf buds

Transpiration-Pull Like drinking from a straw “pulling from up” effect ________________________________________________________________

Did You Know! A maple tree can lose on average 220L of water per hour during the summer due to transpiration!

Cohesion-Tension Theory

Stomata

Cross Section of Dicot Leaf CO2 enters via stomata for photosynthesis. But water can escape too!

What happens to the sugar?

Translocation Translocation – _________________________ ____________________________________________________________________ Movement from ________to _______ Source: ________________________ Mature leaves Sink: ___________________________ Roots, shoot tips, fruits

Pressure-Flow Mechanism

Plant Hormones What are some factors that affect plant growth?

Auxins ________________________________________ Also trigger formation of roots, leaves and fruit (surrounding ovary of seed) Seedless Veggies!

Cytokinins Promote cell division ______________________ ____________________________________________

Giberellins Promote cell division and cell elongation _____________________________________ _____________________ Increase fruit size, shape and appearance

Ethene _____________________________________ Used in transporting unripened fruit to supermarket Advantages vs. Disadvantages?

Abscisic Acid (ABA) _________________________________ __________________________________________________________________________ Promotes dormancy in seeds After 11 days without water, the control plant (left) is dying while the ABA analog-treated plant (right) remains healthy.

Homework  Section 14.3 and 15.1 Pg.404 #1-3 Pg.416 #2,3,5,6,9,17