ecology: lecture 3 plant adaptations to the light environment (physiological ecology)
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![Page 1: Ecology: Lecture 3 Plant adaptations to the light environment (Physiological Ecology)](https://reader034.vdocuments.us/reader034/viewer/2022052312/56649d4e5503460f94a2dac2/html5/thumbnails/1.jpg)
Ecology: Lecture 3Ecology: Lecture 3
Plant adaptations to the light environment (Physiological Ecology)
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PAR: Photosynthetically PAR: Photosynthetically active radiation (400-740 active radiation (400-740
nm)nm)
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P-I CurveP-I Curve
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PhotoinhibitionPhotoinhibition
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Photosynthesis: reviewPhotosynthesis: review
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Photosynthesis: Photosynthesis: light-dependent light-dependent
reactionsreactions What do these
reactions accomplish?
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Photosynthesis: Photosynthesis: light-light-inindependent dependent
reactionsreactions What do
these reaction accomplish?
Role of rubisco?
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Benefit vs. cost of Benefit vs. cost of rubisco reductionrubisco reduction
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Changes in leaf orientationChanges in leaf orientation
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Shade-tolerant vs. intolerant Shade-tolerant vs. intolerant plantsplants
Terrestrial Aquatic
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Responses to UV Responses to UV radiationradiation
What is the relationship between the ozone layer and UV-B?
What are the consequences of UV-B exposure to primary producers? DNA damage, change in growth form,
reduction in yield Example: In situ studies in the Antarctic ozone
hole (1990) suggest a reduction of 6-12% of primary production due to the ozone hole
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Plant defenses against Plant defenses against UV-BUV-B
Compounds that absorb UV-B Effects on photosynthesis? Tropical and alpine plants are more
capable of blocking UV-B radiation Does this make adaptive sense? How so?
Plants with short-lived seasonal leaves were less effective at blocking UV-B rays. Does this make adaptive sense? How so?