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首页> 外文会议>Photosynthesis research for food, fuel and future >Effect of Exposure to UVA Radiation on Photosynthesis and Isoprene Emission in Populus x Euroamericana
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Effect of Exposure to UVA Radiation on Photosynthesis and Isoprene Emission in Populus x Euroamericana

机译：暴露于紫外线辐射对欧洲杨的光合作用和异戊二烯排放的影响

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Isoprene, which accounts for about 40% of the global emission of biogenic volatile organic compounds, plays a dual role in the plant-environment interactions. Outside the plants, isoprene can substantially increase the amount of tropospheric ozone in the atmosphere, whereas in plants isoprene plays a protective role under different stress conditions. The magnitude of isoprene emissions may be altered by increasing UVA radiation. We examined the effects of acute UVA radiation on carbon assimilation, isoprene emission, and photochemical reflectance index (PRI) in Populus x euroamericana saplings. Plants were exposed to either ambient UVA (30 W m-2) or enhanced UVA (60, 90 and 120 W m-2) radiation until the treated leaves had shown stable values of photosynthesis. Our results show that the inhibition of photosynthesis and stomatal conductance induced by high UVA radiation was mirrored by similar reduction in PRI. In contrast, isoprene emission was strongly stimulated by increasing doses of UVA radiation, confirming that isoprene formation may have direct or indirect functions in increasing plant tolerance to stresses. These findings may be likely relevant to predict the emissions of isoprenoid in globally changing environmental condition, global atmospheric chemistry, carbon cycles and climate.
机译：异戊二烯约占生物挥发性有机化合物全球排放量的40％，在植物与环境的相互作用中起着双重作用。在植物外部，异戊二烯可以大大增加大气中对流层臭氧的含量，而在植物中，异戊二烯在不同的胁迫条件下起保护作用。异戊二烯的排放量可通过增加UVA辐射来改变。我们检查了急性UVA辐射对胡杨x欧洲美洲树苗中碳同化，异戊二烯排放和光化学反射指数（PRI）的影响。将植物暴露于环境UVA（30 W m-2）或增强的UVA（60、90和120 W m-2）辐射下，直到处理过的叶片显示出稳定的光合作用值为止。我们的结果表明，高UVA辐射诱导的光合作用和气孔导度的抑制作用与PRI的类似降低反应一致。相反，增加剂量的UVA辐射会强烈刺激异戊二烯的释放，这证实异戊二烯的形成可能具有直接或间接的作用，以增加植物对逆境的耐受性。这些发现可能与预测全球变化的环境条件，全球大气化学，碳循环和气候中的类异戊二烯排放有关。

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