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Plant Adaptations to Light and Environmental Factors

Explore the various adaptations of plants to light, temperature, water stress, and nutrient limitations. Learn about different plant categories and their specific adaptations. Test your knowledge with a quiz!

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Plant Adaptations to Light and Environmental Factors

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  1. Plant adaptations to light Figure 6.6 (EFB)

  2. Figure 6.7 (EFB)

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

  4. 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

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

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

  12. Venus flytrap: endemic species to Southeast

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

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

  15. Quiz • What is difference between light saturation and light • compensation? • What is acclimatization and give an example? • What are the five limiting factors that affect plant • growth and adaptations? • What is the function of abcisic acid (ABA) in plants? • What are mesophytes and halophytes?

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