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Roots (Organization (fibrous root systems (arises due to death of radicle,…
Roots
Organization
tap root
develops from radicle
lateral roots
smaller roots branching from taproot
fibrous root systems
arises due to death of radicle
develops from a root primordia
adventitious roots
increase water absorption and trasportation
Individual Structure
root cap
mucigel
cells are small and meristematic at tip
pushes through soil
root meristem
quiescent center
mitotically inactive center
zone of elongation
enlarging of cells
protoderm
diffuses into epidermis
tissues are quite permeable
provascular tissue
root hair zone
aka zone of maturation
root hairs grow
greatly increases water absorption
endodermis
casparian strip
Types of roots
storage
long term storage of carbs
beets carrots celery etc
Prop roots
buttress roots
prevents trunk from being blown over by wind
contractile
keeps stem at proper depth/height
many bulbous plants
Mychorrhizae
most seed plants (80%)
ectomycorrhizal relationship
fungal hypahe penetrate the cortex walls but not the casparian strip(herbaceous plants)
endomychorrhizal asssociation
fungal hyphae penetrate outermost root cells but not cells themselves (woody forest plants)
