1. Plant adaptations to light
Figure 6.6 (EFB)

2. Figure 6.7 (EFB)

3. creosote arum Sun Plants more Rubisco less chlorophyll small leaves
Shade plants
less Rubisco
more chlorophyll
large leaves
creosote
arum

4. A reduction in light intensity due to absorption, reflection, etc.
Light Attenuation
A reduction in light intensity
due to absorption, reflection, etc.
Figure 3.3 (EFB)

5. Light attenuation occurs in aquatic environments as well

6. Temperature affects leave shape and size
Figure 6.11

7. In response to high temperatures, and
to limit water loss, plant morphology
can vary in having:
serrated or lobed leaves
small hair-like structures
waxy cuticles
small leaves
no leaves

8. Plants may also be able to acclimitize to seasonal
shifts in temperature
-- reversible physiological changes to cope with
changes in local environment
-- acclimate = change induced in laboratory
-- acclimitize = change under natural conditions

9. Abcisic acid (ABA) produced to increase cell membrane permeability
Response to photoperiod
Response to first frosts

11. Adaptations to water stress
Tap root in phreatophyte
Spreading root system at surface

13. Nutrient limitations and
carnivorous plants
Pitcher Plants
4 spp. in our area

14. Venus flytrap: endemic species to Southeast

15. Adaptations to limitations in gases: CO2 and O2
Hydrophyte with lacunae

16. Plant categories based on adaptations:
Xerophytes: desert plants
Mesophytes: temperate plants
Halophytes: salty soils
Hydrophytes: aquatic environments