Interactions Among Plant Systems Biology 10(B). Learning objectives Identify major systems in plants...
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Transcript of Interactions Among Plant Systems Biology 10(B). Learning objectives Identify major systems in plants...
Interactions Among Plant SystemsBiology 10(B)
Learning objectives• Identify major systems in plants• Describe the interactions that occur among
systems to carry out vital plant functions
Interactions Among Plant Systems
• Organ systems:– Shoot system – above-
ground – Root system – below-
ground
• Tissue systems:– Dermal – barrier– Ground – metabolic
functions– Vascular – transport
Plant Systems
Sh
oot
syst
em
Root
syst
em
DermalGround
Vascular
Tissues
Organ and tissue systems interact to carry out vital functions• Transport• Reproduction• Response
Interactions Among Plant Systems
• Movement of needed materials throughout plant
• Major function of vascular tissue– Xylem – transports
water and minerals– Phloem – transports
glucose– Both transport
hormones
Transport
Interactions during transport• Root system– Absorbs water and minerals
• Shoot system– Ground tissue produces glucose through
photosynthesis
• Both organ systems– Produce hormones– Vascular tissue transports all materials
throughout the plant
Interactions Among Plant Systems
Vegetative propagation – offspring produced from part of a plant organ• Asexual
Pollination – offspring produced via pollinated seeds • Sexual
Reproduction
Image by Roberto MM [GFDL]
• Flower – organ that produces seeds
• Fruit – develops around fertilizedovule(s)
• Seed – fertilized ovule (embryo) and stored food (cotyledon) surrounded by a protective seed coat
Reproduction by Pollination
Interactions during reproduction• Vegetative propagation– Shoot and root systems: part of an organ
produces a new plant
• Pollination– Shoot system: flowers are the site of seed
pollination and fruit development– Shoot and root systems: produce hormones,
transported by the vascular tissue, that regulate flower budding, fruit ripening and seed growth
Interactions Among Plant Systems
• Tropisms – plant’s hormonal growth response toward or away from an external stimulus
• Examples:– Phototropism – stem and leaves grow toward a
light source– Positive gravitropism – roots grow toward gravity
(downward)– Negative gravitropism – stem and leaves grow
away from gravity (upward)
Response
Interactions during response• Root system– Grows toward gravity
• Shoot system– Grows toward light and/or away from gravity
• Both systems– Produce hormones – Transported hormones
Interactions Among Plant Systems
Learning objectives• Identify major systems in plants• Describe the interactions that occur among
systems to carry out vital plant functions
Interactions Among Plant Systems