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Air Pollutant-Low Temperature Interactions in Trees
Pages 341-346

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From page 341...
... Ozone is known to affect both photosynthesis and carbohydrate allocation and to stimulate antioxidant production in actively growing crop species, but its metabolic effects on winter hardening in conifers have not been studied. Results from a dose-response study carried out on red spruce seedlings at Boyce Thompson Institute suggest that ozone exposure during the summer and fall leads to changes in carbohydrate metabolism associated with winter hardening and to cell damage during the late fall and early winter.
From page 342...
... During the winter, when de novo production of antioxidants may be low, plants that have been previously depleted of antioxidant reserves by ozone may incur damage when protective and repair mechanisms are insufficient to protect tissue further from cold injury. We have biochemical and histological evidence that ozone exposure both altered winter hardening processes and increased cellular damage during early winter frosts of
From page 343...
... The patterns can be fit into a scenario where prior exposure to ozone overloads the cell's antioxidant resistance mechanisms past some critical level or "threshold," beyond which the cells can no longer tolerate the processes associated with exposure to low temperatures, e.g., free radical production. Were this threshold to be established experimentally, it might be possible to use it as an indicator or "marker" of air pollution stress on coniferous forest tress.
From page 344...
... A possible protective enzyme against ozone injury in snap beans (Phaseolus vulgaris L.~. Plant Physiol.
From page 345...
... 1978. Seasonal changes in mesophyll ultrastructure of needles of Norway spruce (Picea abies)
From page 346...
... A possible protective enzyme against ozone injury in snap beans (Phaseolus vulgaris L.~. Plant Physiol.

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