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Air pollution

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Duration of ozone exposure<br />

Acute ozone exposure:<br />

Change in membrane permeability<br />

unregulated cell death<br />

Elicitor release increased<br />

programmed cell death<br />

cell repair mechanism<br />

cell protection mechanism<br />

Low level-long term<br />

ozone exposure:<br />

Scavenge of AOS with antioxidants<br />

detoxification<br />

Elicitor release<br />

accelerated foliar<br />

senescence<br />

Herschbach 2007

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