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Ecology of Photosynthesis

Ecology of Photosynthesis. Photosynthetically Active Radiation (PAR). The Light Compensation Point. PPFD = Photosynthetic Photon Flux Density. Three Forest Understory Herbs. Summer-green: Viola pubescens. Spring ephemeral: Allium tricoccum. Semi-evergreen: Tiarella cordifolia.

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Ecology of Photosynthesis

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  1. Ecology of Photosynthesis

  2. Photosynthetically Active Radiation (PAR)

  3. The Light Compensation Point PPFD = Photosynthetic Photon Flux Density

  4. Three Forest Understory Herbs Summer-green: Viola pubescens Spring ephemeral: Allium tricoccum Semi-evergreen: Tiarella cordifolia

  5. Light Compensation Points

  6. Maximum Photosynthetic Rates

  7. Photorespiration: A curious bottleneck in C3 Photosynthesis

  8. Key enzyme 3-carbon compound Catalysis of carbon fixation in Photosynthesis

  9. Photosynthesis • Photorespiration Photorespiration: An alternate pathway Rubisco catalyzes two competing reactions: Rubisco

  10. Ecological Factors Increasing Photorespiration Rates High temperatures Rubisco Low CO2 concentrations

  11. The Stomate as a Bottleneck Under Water Stress O2 H2O CO2

  12. C4 Photosynthesis: A Solution in Space C4 Grass C3 reactions in bundle sheath C3 Grass C3 reactions throughout

  13. C4 Intermediates produced in low CO2 environment of mesophyll (1000 02 : 1 CO2 ) C4 Photosynthesis: A Solution in Space • CO2 concentrated in bundle sheath (100 02 : 1 CO2 )

  14. Differential Response of C4 and C3 Plants Light response Temperature response

  15. CAM Photosynthesis: A Solution in Time

  16. CAM Photosynthesis: A Solution in Time CO2 Capture by Night Photosynthesis by Day

  17. Distribution Patterns of the Three Photosynthesis Types

  18. Geographic Patterns in the Distribution of the Proportion of C4 Grasses

  19. C3 – Cool Season Grasses C4 – Warm Season Grasses • Lower temperatures • Lower total rainfall • Higher winter rains • Higher temperatures • Higher total rainfall • Higher summer rains

  20. Habitats Favoring CAM Plants Epiphytes – Plants using other plants for support Arid habitats – deserts and semi-deserts that aren’t too extremely dry

  21. Ecology of Photosythesis Part II

  22. Sun and Shade Leaves Shade Sun

  23. Anatomy of Sun and Shade Leaves (Thermopsis montana): a general view Sun Leaf Shade Leaf • Smaller • Thicker • More rubisco • More chlorophyll • Bigger • Thinner • Less rubisco • Less chlorophyll

  24. Sun and Shade Leaves: Response to Light (Fagus sylvaticus)

  25. Light capture and leaf orientation

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