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Fotoinhibering hos akvatiske planter

Fotoinhibering hos akvatiske planter. Søren Laurentius Nielsen Hanne Dalsgaard Nielsen. Her sammenliges to planter med forskellig strategi mht. C-optag: Callitriche cophocarpa (CO 2 – bruger) og Elodea canadensis (bicarbonatbruger) ved forskellige koncentrationer af fri CO 2

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Fotoinhibering hos akvatiske planter

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  1. Fotoinhibering hos akvatiske planter Søren Laurentius Nielsen Hanne Dalsgaard Nielsen Department of Environmental, Social and Spatial Change

  2. Department of Environmental, Social and Spatial Change

  3. Department of Environmental, Social and Spatial Change

  4. Department of Environmental, Social and Spatial Change

  5. Department of Environmental, Social and Spatial Change

  6. Department of Environmental, Social and Spatial Change

  7. Department of Environmental, Social and Spatial Change

  8. Her sammenliges to planter med forskellig strategi mht. C-optag: Callitriche cophocarpa (CO2 – bruger) og Elodea canadensis (bicarbonatbruger) ved forskellige koncentrationer af fri CO2 (~ 100 μM og ~ 3 mM; ”masser” af bicarbonat) Department of Environmental, Social and Spatial Change

  9. Larcher: Physiological Plant Ecology Department of Environmental, Social and Spatial Change

  10. Hypoteser, 1 • Callitriche forventes at være mere udsat for fotoinhibering end Elodea ved lave koncentrationer af fri CO2 • Denne forskel forventes udvisket ved høje koncentationer af fri CO2 • En evt. fotoinhibering af Elodea forventes ikke at afhænge af tilgængeligheden af fri CO2 Department of Environmental, Social and Spatial Change

  11. Department of Environmental, Social and Spatial Change

  12. Department of Environmental, Social and Spatial Change

  13. Konklusioner, 1 • Hypoteserne bekræftes delvist, men ikke meget overbevisende • hvorfor fotoinhiberer Callitriche ved høj fri CO2 senere end Elodea? Department of Environmental, Social and Spatial Change

  14. Hypoteser, 2 • Callitriches vækst vil være afhængigt af koncentrationen af fri CO2, det vil Elodeas ikke Department of Environmental, Social and Spatial Change

  15. Department of Environmental, Social and Spatial Change

  16. Konklusioner, 2 • Vi ser den forventede forøgelse af Callitriches vækst ved forøget fri CO2; men et fald i Elodeas vækst? Department of Environmental, Social and Spatial Change

  17. Hypoteser, 3 • Callitriche har, især under lave koncentrationer af fri CO2, et højere forsvarsberedskab mod fotoinhibering end Elodea Department of Environmental, Social and Spatial Change

  18. Department of Environmental, Social and Spatial Change

  19. Department of Environmental, Social and Spatial Change

  20. Konklusioner, 3 • Hypotesen kan ikke bekræftes • Især ved lav CO2 har Elodea et langt højere indhold af accessoriske pigmenter end Callitriche • Normaliseret til klorofyl a forsvinder forskellene mellem arterne. Forskellene mellem lav og høj CO2 treatment er ”omvendt” ifht. forventet for Callitriche, men kan (ikke forventet) ses hos Elodea Department of Environmental, Social and Spatial Change

  21. Department of Environmental, Social and Spatial Change

  22. Afsluttende konklusioner • Den oprindelige hypotese var at CO2-brugere skulle være mere udsat for fotoinhibering end bicarbonatbrugere • Det er ikke overbevisende vist her • Det er muligt at fotorespiration modvirker fotoinhibering (jf. C3 vs. C4 planter), og at Elodea er mest udsat (?) • Øvrige forsvarsmekanismer (enzymatiske) bør dog også tjekkes (SOD og APO måles pt., men nåede ikke at blive færdige til symposiet) Department of Environmental, Social and Spatial Change

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