Interactions Among Plant Systems

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Interactions Among Plant Systems
Biology 10(B)
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• Interactions Among Plant Systems

• Learning objectives
• Identify major systems in plants
• Describe the interactions that occur among
  systems to carry out vital plant functions

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• Plant Systems

• Organ systems
• Shoot system above- ground
• Root system below-ground

Shoot system

• Tissue systems
• Dermal barrier (between inside the plant and
  outside)
• Ground metabolic functions (such as
  photosynthesis)
• Vascular transport

Root system
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• Interactions Among Plant Systems

• Organ and tissue systems interact to carry out
  vital functions- ALL 3 are necessary for a plant
  to survive
• Transport
• Reproduction
• Response

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• Transport

• Movement of needed materials throughout plant
• Major function of vascular tissue
• Xylem transports water and minerals (UP)
• Phloem transports glucose (DOWN from leaves)
• Both transport hormones

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• Interactions Among Plant Systems

• 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

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• Reproduction

• Vegetative propagation offspring produced from
  part of a plant organ, such as a root or stem
• Asexual

• Pollination offspring produced via pollinated
  seeds
• Sexual

Image by Roberto MM GFDL
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• Reproduction by Pollination

• Flower organ that produces seeds

• Seed fertilized ovule (embryo) and stored food
  (cotyledon) surrounded by a protective seed coat

• Fruit develops around
  fertilizedovule(s)

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• Interactions Among Plant Systems

• 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

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• Response

• Tropisms plants 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)

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• Interactions Among Plant Systems

• Interactions during response
• Root system
• Grows toward gravity
• Shoot system
• Grows toward light and/or away from gravity
• Both systems
• Produce hormones
• Transported hormones

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• Interactions Among Plant Systems

• Learning objectives
• Identify major systems in plants
• Describe the interactions that occur among
  systems to carry out vital plant functions