Plant 'body clock' observed in tropical rainforest; Research to aid ozone pollution predictions

Predictions of the ground-level pollutant ozone may be more accurate in the future, thanks to new research into plant circadian rhythms. Ozone is formed in the atmosphere when volatile organic compounds like isoprene -- which is emitted by some plants - react with nitrogen oxides from car engines or industry. Ozone at ground level is very harmful to human health, may decrease crop yields, and is a greenhouse gas. Researchers have now found that the rate at which plants emit isoprene is influenced by their body clock or circadian rhythm.

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