Plant PhysiologyPlant Physiology

What happens inside What happens inside the plant!the plant!

Plant TaxonomyPlant Taxonomy

MonocotsMonocots

DicotsDicots

The Three Areas We The Three Areas We Will Look AtWill Look At

1. The plant parts1. The plant parts

2. Metabolic processes2. Metabolic processes

3. Growth3. Growth

Leaf Structure & Leaf Structure & FunctionFunction

Cross Section of Pine Cross Section of Pine NeedleNeedle

Bud TypesBud Types

Tree Trunk Tree Trunk ComponentsComponents

StomatesStomates

Vascular SystemVascular System

Vascular System up closeVascular System up close

Modified StemsModified Stems

Requirements for P.S. -high light intensity -water -CO2

Products of P.S. - food (glucose) - oxygen

PhotosynthesisPhotosynthesis

Occurs only in light

Photosynthesis cont.Photosynthesis cont.

Purpose of Purpose of PhotosynthesisPhotosynthesis

To convert sunlight, water To convert sunlight, water & nutrients into stored & nutrients into stored

energy and energy and carbohydrates.carbohydrates.

RespirationRespiration

Requirements of Requirements of Respiration Respiration

--food (sugars, carbo., food (sugars, carbo., proteins, fats)proteins, fats)

-oxygen -oxygen

Products of Respiration Products of Respiration

-energy(ATP) -energy(ATP)

-water -water

-CO2 -CO2

Occurs in light and darkOccurs in light and dark

RespirationRespiration

6CO2 + 12H2O + Light Energy

C6H12O6 + 6O2 + 6H2O

(Photosynthesis) (Respiration)

The EquationThe Equation

P

P

P&R

R

R

R

R

Photosynthesis versus Respiration

TranspirationTranspiration

Is the evaporative loss of Is the evaporative loss of water water from plants from plants It is the super-highway for It is the super-highway for nutrient nutrient transport transport Cools the plant Cools the plant Occurs primarily on the Occurs primarily on the lower leaf lower leaf surfacesurface

Transpiration and Transpiration and TransportTransport

Root AbsorptionNeed O2 for

uptake A decrease in P.S. results in a decrease in root

absorptionAbsorption requires

energy

Environmental Environmental FactorsFactors

Light Light -intensity -intensity

-quality -quality

-duration -duration Temperature Temperature WaterWater

Root InterceptionRoot Interception

Roots intercept nutrients as they grow & expand in the soil.

Mass FlowMass Flow

Moving of large volumes of water, with nutrients in the solution, to plant roots

DiffusionDiffusion

Moving of nutrients from areas of higher concentration to equal concentrations in an area.

Flower Parts

Flower TypesFlower Types

Staminate - Contains Staminate - Contains only stamens (pollen)only stamens (pollen)

Pistillate - Contains only Pistillate - Contains only a pistil(s)a pistil(s)

Flower Types on Flower Types on PlantsPlants

Monoecious - Have male & Monoecious - Have male & female flowers, but on same female flowers, but on same plant. Ex. Corn & Pecans.plant. Ex. Corn & Pecans.

Dioecious - Have male & Dioecious - Have male & female plants. Ex. Holly female plants. Ex. Holly

Cross-polliniationCross-polliniation

Pollen from on plant is Pollen from on plant is transferred to the stigma of transferred to the stigma of another.another.

Self-pollination is when the Self-pollination is when the stigma is pollinated by stigma is pollinated by pollen from the same plant.pollen from the same plant.

Plant PhysiologyPlant Physiology

AcknowledgementsAcknowledgementsOregon St Dept. of BotanyOregon St Dept. of Botany

SC Nurseryman Assoc.SC Nurseryman Assoc.