The simplest ORGAN. ORGANS ORGANS - have one or more FUNCTIONS and composed of SEVERAL TISSUES ROOTS are the simplest.

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Presentation transcript:

The simplest ORGAN

ORGANS ORGANS - have one or more FUNCTIONS and composed of SEVERAL TISSUES ROOTS are the simplest

FUNCTIONS of ROOTS ANCHORAGE

FUNCTIONS of ROOTS ABSORBING and CONDUCTING Water and Nutrients

FUNCTIONS of ROOTS FOOD STORAGE Taproots Fascicled roots

FUNCTIONS of ROOTS FOOD STORAGE in Cortex

FUNCTIONS of ROOTS All ROOTS are for: Anchorage Absorbing and Conducting Nutrients Food Storage Some can REPRODUCE by root cuttings

CLASSIFICATION of ROOTS Based on ORIGINATION PRIMARY SECONDARY ADVENTITIOUS

CLASSIFICATION of ROOTS Based on TYPE of ROOT SYSTEM Taproot Fibrous Fascicled

ROOT ANATOMY Region of Maturation (Differentiation) Region of Elongation Meristem Region Quiescent Zone Root Cap

ROOT ANATOMY Dicots

ROOT ANATOMY Monocots

ROOT ANATOMY Secondary or Lateral root generation

ROOT PHYSIOLOGY Water and Nutrient CONDUCTION is comprised of THREE ACTIONS ROOT PRESSURE CAPILLARITY TRANSPIRATION

ROOT PHYSIOLOGY ROOT PRESSURE OSMOSIS Pathway A – Intercellular Spaces Pathway B – Root Hairs

ROOT PHYSIOLOGY ROOT PRESSURE Casparian Strip

ROOT PHYSIOLOGY CAPILLARY ACTION (or Capillarity) Adhesion Cohesion

ROOT PHYSIOLOGY TRANSPIRATIONAL PULL (or Transpiration) As WATER EVAPORATES or DIFFUSES from the surface of a leaf, and as cells replace water, the continuous loss of water PULLS it up through plant

SPECIALIZED ROOTS and ASSOCIATIONS PROP ROOTS CLIMBERS PNEUMATOPHORES

SPECIALIZED ROOTS and ASSOCIATIONS EPIPHYTES CONTRACTILE ROOTS PARASITIC ROOTS

ROOT ASSOCIATIONS MYCORRHIZAL Associations ”Fungus Root” MUTUALISTIC fungus/plant relationship Helps absorb WATER and NUTRIENTS for PLANT Plant provides SUGARS for FUNGUS

ROOT ASSOCIATIONS MYCORRHIZAL Associations

ROOT ASSOCIATIONS BACTERIAL Associations MUTUALISTIC bacterial/plant relationship BACTERIA absorbs NITROGEN from atmosphere, and converts it into AMMONIUM (NH 4 -) a NUTRIENT for PLANTS PLANT provides SUGARS for BACTERIA