interactions among plant systems

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

Shoo

t sys

tem

Roo

t sys

tem

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