ENVS 1126 Lecture Notes - Lecture 15: Superoxide Dismutase, Tropospheric Ozone, Reactive Oxygen Species
22 Nov 2016
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Document Summary
Where does ozone come from: tropospheric ozone: Nitrogen oxides + volatile organic compounds + uv light o3. Stratosphere: ozone in the stratosphere forms the ozone shield and reduces entry of uv light into the. Earth"s troposphere: ozone in the atmosphere is a pollutant and greenhouse gas and can cause health effects such as lung irritation and wheezing. Stomata: allow co2 in and water and o2 out, also allow ozone in. Ozone impacts plants in the following ways: foliage (leaf damage, aging (senescence, falling (abscission, stomata, transpiration, transport (of carbon, water, nutrients, flowering, abortion (of grains, stresses. Ozone in plants (as in humans) reacts with internal molecules and structures: forms ros"s, damage, plant attempts to respond to damage, generates more ros"s, chain reaction. Ozone sensitivity and adaptation: newer plants are more resistant to ozone"s effects, certain genes have been discovered that render plants resistant to ozone, selective cross-breeding (and marker-assisted breeding) more than genetic engineering.
