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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 Figure 6.6 (EFB)
Sun Plants more Rubisco less chlorophyll small leaves Shade plants less Rubisco more chlorophyll large leaves creosote arum
Light Attenuation A reduction in light intensity due to absorption, reflection, etc. Figure 3.3 (EFB)
Temperature affects leave shape and size Figure 6.11
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
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
Abcisic acid (ABA) produced to increase cell membrane permeability Response to photoperiod Response to first frosts
Adaptations to water stress Tap root in phreatophyte Spreading root system at surface
Nutrient limitations and carnivorous plants Pitcher Plants 4 spp. in our area
Adaptations to limitations in gases: CO2 and O2 Hydrophyte with lacunae
Plant categories based on adaptations: Xerophytes: desert plants Mesophytes: temperate plants Halophytes: salty soils Hydrophytes: aquatic environments
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?