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Response of ponderosa pine primary needles to separate and simultaneous ozone and PAN exposures



Response of ponderosa pine primary needles to separate and simultaneous ozone and PAN exposures



Plant Disease Reporter 61(8): 640-644



Young Pinus ponderosa seedlings in the primary needle stage were exposed to acute doses of ozone, PAN or both. The seedlings were visibly injured by ozone but not by PAN. Exposure to the 2 pollutants simultaneously caused significantly less injury on 6-week-old plants than did ozone alone, indicating an antagonistic response at this age. The same trend was observed for 10-week-old plants, but injury reduction was not significant.

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Accession: 000485831

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