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首页> 外文期刊>Ecological research >Combined effect of elevated CO_2 concentration and drought on the pho- tosynthetic apparatus and leaf morphology traits in seedlings of yellow poplar
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Combined effect of elevated CO_2 concentration and drought on the pho- tosynthetic apparatus and leaf morphology traits in seedlings of yellow poplar

机译：CO_2浓度升高和干旱对黄杨幼苗光合作用及叶片形态性状的联合影响

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摘要

To counter the threat of drought, which is expected to increase in the future, we analyzed the combined effects of elevated carbon dioxide (CO2) concentration and drought on the photosynthetic apparatus and morphological traits in seedlings of yellow poplar (Liriodendron tulipifera). The plants were grown for four months in a phytotron under different CO2 concentrations [ambient CO2, 430 ppm, AC) and elevated CO2, 640 ppm, EC] and water treatment [field capacity, FC and 50% of field capacity, FC50]. FC50 was sufficient for inducing a reduction in the photosynthetic rate of L. tulipifera. However, under FC50 combined with EC, we observed an increase in photosynthetic rate with increased photopigment content, photochemistry efficiency, and light harvesting ability. Further, decreased specific leaf area and increased wax coverage in EC suggested that EC contributed to protect chloroplasts and reduce water loss. In conclusion, functional improvements of the photosynthetic apparatus with changes in morphological traits were observed under FC50 combined with EC and EC ameliorated the adverse effect of FC50 on the seedlings of L. tulipifera.
机译：为了应对干旱的威胁，干旱可能会在未来加剧，我们分析了二氧化碳（CO2）浓度升高和干旱对黄杨（Liriodendron tulipifera）幼苗光合作用和形态特征的综合影响。这些植物在不同的CO2浓度（环境CO2，430 ppm，AC）和升高的CO2，640 ppm，EC和水处理（田间能力FC和田间能力的50％，FC50）下在光电子加速器中生长四个月。 FC 50足以诱导郁金香L.的光合速率降低。然而，在FC50结合EC的条件下，我们观察到光合作用速率随光色素含量，光化学效率和光收集能力的增加而增加。此外，EC中比叶面积的减少和蜡覆盖率的增加表明EC有助于保护叶绿体并减少水分流失。综上所述，在EC联合EC50的条件下，观察到光合作用设备的功能随着形态学特征的变化而改善，EC改善了FC50对郁金香幼苗的不利影响。

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