Living plants growing at their normal temperatures released as much as 370 nanograms of methane per gram of plant tissue per hour.Methane emissions tripled when living and dead plant was exposed to sunlight.

　　Because there was plenty of oxygen availables unlikely that the types of bacteria that normally make methane were involved.Experiments on plants that were grown in water rather than soil also resulted in methane emissions.Thats another strong sign that the gas came from the plants and not soil microbes.

　　The new finding is an interesting observation, says Jennifer Y.Kinga biogeochemist at the University of Minnesota in St.Paul3.Because some types of soil microbes consume methanethey may prevent plant-produced methane from reaching the atmosphere.Field tests will be needed to assess the plants influenceshe notes.(367 words)

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