Variation in solar ultraviolet radiation induces a wide-range of plant responses from the cellular to whole-plant scale. We demonstrate here for the first time that partial stomatal closure caused by ultraviolet radiation exposure results in significant increases in leaf temperature. Significant leaf warming in response to ultraviolet radiation was consistent in tomato (Solanum lycopersicum L.) across different experimental approaches. In field experiments where solar ultraviolet radiation was attenuated using filters, exposure to ultraviolet radiation significantly decreased stomatal conductance and increased leaf temperature by up to 1.5°C. Using fluorescent lamps to provide ultraviolet radiation treatments, smaller but significant increases in leaf temperature due to decreases in stomatal conductance occurred in both multi-day controlled environment growth room experiments and short-term (< 2 hours) climate cabinet irradiance response experiments. We show that leaf warming due to partial stomatal closure is independent of any direct warming effects of ultraviolet radiation manipulations. We discuss the implications of ultraviolet radiation-induced warming both for horticultural crop production and understanding broader plant responses to ultraviolet radiation.

中文翻译：

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由于部分气孔关闭，紫外线辐射导致叶片变暖。

太阳紫外线辐射的变化引起了从细胞到整株植物的广泛植物反应。我们在这里首次证明，由紫外线辐射暴露引起的部分气孔关闭导致叶片温度显着升高。在不同的实验方法中，番茄 (Solanum lycopersicum L.) 对紫外线辐射的显着叶片变暖是一致的。在使用过滤器减弱太阳紫外线辐射的田间实验中，暴露于紫外线辐射显着降低了气孔导度，并使叶片温度升高了 1.5°C。使用荧光灯提供紫外线辐射治疗，在多天受控环境生长室实验和短期（< 2 小时）气候柜辐照响应实验中，由于气孔导度的降低，叶片温度发生了较小但显着的升高。我们表明，由于部分气孔关闭而导致的叶片变暖与紫外线辐射操作的任何直接变暖效应无关。我们讨论了紫外线辐射引起的变暖对园艺作物生产和了解更广泛的植物对紫外线辐射的反应的影响。