Interactions Among Plant Systems

1. Interactions Among Plant Systems Biology 10(B)

2. Learning objectives • Identify major systems in plants • Describe the interactions that occur among systems to carry out vital plant functions • Interactions Among Plant Systems

3. Organ systems: • Shoot system– above- ground • Root system– below-ground • Tissue systems: • Dermal – barrier • Ground – metabolic functions • Vascular– transport • Plant Systems Tissues Dermal Ground Vascular Shoot system Root system

4. Organ and tissue systems interact to carry out vital functions • Transport • Reproduction • Response • Interactions Among Plant Systems

5. Movement of needed materials throughout plant • Major function of vascular tissue • Xylem – transports water and minerals • Phloem – transports glucose • Both transport hormones • Transport

6. 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

7. Vegetative propagation– offspring produced from part of a plant organ • Asexual Pollination – offspring produced via pollinated seeds • Sexual • Reproduction Image by Roberto MM [GFDL]

8. 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

9. 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

10. 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

11. 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

12. Learning objectives • Identify major systems in plants • Describe the interactions that occur among systems to carry out vital plant functions • Interactions Among Plant Systems