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Light & Photosynthesis or “You light up my life”

Light & Photosynthesis or “You light up my life”. A/H 100G J.G. Mexal. CO 2 capture. Basic Photosynthetic Reaction CO 2 + H 2 O CH 2 O + O 2 1.47 lb 0.60 lb 1.00 lb 1.07 lb. λ. Photosynthesis Action Spectra of Lights vs Chl a & b Absorption. Cool white fluorescent light.

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Light & Photosynthesis or “You light up my life”

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  1. Light & Photosynthesisor“You light up my life” A/H 100G J.G. Mexal

  2. CO2 capture Basic Photosynthetic Reaction • CO2 + H2O CH2O + O2 • 1.47 lb 0.60 lb 1.00 lb 1.07 lb λ

  3. PhotosynthesisAction Spectra of Lights vs Chl a & b Absorption Cool white fluorescent light Incandescent light Chlorophyll A & B

  4. PhotosynthesisLight Compensation and Saturation Points Net Ps (mgCO2/cm2/h) S.P. C.P. 2000 4000 6000 Light Intensity (fc)

  5. PhotosynthesisSun vs Shade Leaves Shade Sun Epidermis Palisade Mesophyll Spongy Mesophyll Epidermis Stomata

  6. PhotosynthesisPathways for Photosynthesis • C-3 = most crops • C-4 = arid shrubs, grasses, pineapple • CAM = succulents • (crassulacean acid metabolism)

  7. PhotosynthesisC3, C4, and CAM Plants

  8. PhotosynthesisCharacteristics of C3 and C4 Plants

  9. PhotosynthesisSimplified C3 Pathway

  10. PhotosynthesisC3 Leaf Structure Epidermis Palisade mesophyll Vein Vein Spongy mesophyll

  11. PhotosynthesisLight Compensation and Saturation Points

  12. PhotosynthesisInteraction between CO2 and Light Intensity Photosynthesis Rate 1,300 ppm CO2 1600 ppm CO2 360 ppm CO2 Light Intensity

  13. PhotosynthesisSimplified C4 Pathway Spatial Separation

  14. PhotosynthesisSimplified C4 Pathway

  15. PhotosynthesisC4 Leaf Structure Bundle sheath cells Vein Mesophyll

  16. PhotosynthesisDistribution of C4 Plants/ Oecologia 23:1-12:1978 Percent of Dicot Taxa Percent of Grass Taxa

  17. PhotosynthesisC3 & C4 Response to Light Intensity Photosynthesis Sugarcane- C4 Clover- C3 Tobacco- C3 Philodendron-C3 Light Intensity

  18. PhotosynthesisSimplified CAM Pathway Temporal Separation 3-carbon compound

  19. PhotosynthesisSimplified CAM Pathway

  20. PhotosynthesisWhat is this?????

  21. What happens to all the light striking the earth’s surface Light attributes Quality Quantity Duration Plant pigments Imp. Wavelengths Actions Photoperiod response Long-day Short-day Day-neutral Important dates (why?) Ps Reaction Basic C3, C4, CAM Things to Know

  22. Quiz Questions • Give the basic photosynthesis reaction and where does it take place? • Describe the characteristics of C-3 and C-4 plants. Give examples of a C-3 and C-4 plant. • Describe the differences between a C-4 and CAM plant. Give an example of a CAM plant. • What is a ‘short-day plant’? ‘long-day plant’? ‘day-neutral plant’? • How do plant ‘tell time’? What’s the reaction? • Why do C-4 plants have a higher rate of photosynthesis. Describe leaf morphology of both.

  23. Energy (kcal/cm Wavelength (nm) Light and PhotobiologyElectromagnetic Spectrum

  24. Tissue Epidermis Guard cells & stomates Chlorophyll- containing cells Veins Primary Functions Protective cells (keep water within leaf) Allow CO2 & O2 diffusion for Ps & Rs Manufacture ATP & glucose Translocate H2O and nutrient to, and CHO & AA away from, the leaves PhotosynthesisLeaf Tissues & Function

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