5. Living plants growing at their normal temperatures released as much as 370 nanograms of methane per gram of plant tissue per hour. Methane emissions(散发，发射)tripled(增加三倍;) when living and dead plant was exposed to sunlight.

　　6. Because there was plenty of oxygen available, its unlikely that the types of bacteria(bacterium的复数，细菌) 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.

　　7. The new finding is an interesting observation, says Jennifer Y. King, a biogeochemist(生物地球化学家) at the University of Minnesota in St. Paul. Because some types of soil microbes consume methane, they may prevent plant-produced methane from reaching the atmosphere. Field tests will be needed to assess the plants influence, she notes.

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