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首页> 外文期刊>Plant Physiology >Increased Air Temperature during Simulated Autumn Conditions Does Not Increase Photosynthetic Carbon Gain But Affects the Dissipation of Excess Energy in Seedlings of the Evergreen Conifer Jack Pine1,[OA]
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Increased Air Temperature during Simulated Autumn Conditions Does Not Increase Photosynthetic Carbon Gain But Affects the Dissipation of Excess Energy in Seedlings of the Evergreen Conifer Jack Pine1,[OA]

机译：在模拟秋季条件下升高的空气温度不会增加光合作用的碳增益，但会影响常绿针叶树杰克·派恩1 [OA]幼苗中多余能量的耗散。

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摘要

Temperature and daylength act as environmental signals that determine the length of the growing season in boreal evergreen conifers. Climate change might affect the seasonal development of these trees, as they will experience naturally decreasing daylength during autumn, while at the same time warmer air temperature will maintain photosynthesis and respiration. We characterized the down-regulation of photosynthetic gas exchange and the mechanisms involved in the dissipation of energy in Jack pine (Pinus banksiana) in controlled environments during a simulated summer-autumn transition under natural conditions and conditions with altered air temperature and photoperiod. Using a factorial design, we dissected the effects of daylength and temperature. Control plants were grown at either warm summer conditions with 16-h photoperiod and 22°C or conditions representing a cool autumn with 8 h/7°C. To assess the impact of photoperiod and temperature on photosynthesis and energy dissipation, plants were also grown under either cold summer (16-h photoperiod/7°C) or warm autumn conditions (8-h photoperiod/22°C). Photosynthetic gas exchange was affected by both daylength and temperature. Assimilation and respiration rates under warm autumn conditions were only about one-half of the summer values but were similar to values obtained for cold summer and natural autumn treatments. In contrast, photosynthetic efficiency was largely determined by temperature but not by daylength. Plants of different treatments followed different strategies for dissipating excess energy. Whereas in the warm summer treatment safe dissipation of excess energy was facilitated via zeaxanthin, in all other treatments dissipation of excess energy was facilitated predominantly via increased aggregation of the light-harvesting complex of photosystem II. These differences were accompanied by a lower deepoxidation state and larger amounts of -carotene in the warm autumn treatment as well as by changes in the abundance of thylakoid membrane proteins compared to the summer condition. We conclude that photoperiod control of dormancy in Jack pine appears to negate any potential for an increased carbon gain associated with higher temperatures during the autumn season.
机译：温度和日长是决定北方常绿针叶树生长期长度的环境信号。气候变化可能会影响这些树木的季节发展，因为它们在秋季自然会减少日长，与此同时，气温升高将保持光合作用和呼吸作用。我们在自然条件下以及在自然条件下以及气温和光周期变化的情况下，模拟夏季-秋季过渡过程中，表征了受控环境中光合气体交换的下调和参与松树（Pinus bankiana）能量耗散的机制。使用析因设计，我们剖析了日长和温度的影响。对照植物在夏季温暖的条件下，光照时间为16小时和22°C下生长，或者在8h / 7°C的凉爽秋天条件下生长。为了评估光周期和温度对光合作用和能量耗散的影响，还在寒冷的夏季（16小时光周期/ 7°C）或温暖的秋季条件（8小时光周期/ 22°C）下种植植物。光合气体交换受日长和温度的影响。在温暖的秋季条件下，同化和呼吸速率仅为夏季值的一半左右，但与夏季寒冷和秋季自然处理获得的值相似。相反，光合作用效率主要取决于温度，而不取决于日长。不同处理的植物遵循不同的策略来耗散多余的能量。在温暖的夏季治疗中，通过玉米黄质促进了多余能量的安全消散，而在所有其他治疗中，主要通过增加了光系统II的光收集复合物的聚集来促进了过量能量的消散。这些差异伴随着温暖的秋季处理中较低的深氧化状态和大量的胡萝卜素，以及与夏季条件相比类囊体膜蛋白丰度的变化。我们得出的结论是，在秋季期间，光周期控制杰克松的休眠似乎消除了与更高温度相关的碳增加的任何潜在可能性。

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  • 来源
    《Plant Physiology》 |2007年第3期|p.1242-1251|共10页
  • 作者

    Florian Busch Norman P.A. Hüner and Ingo Ensminger*;

  • 作者单位

    Department of Biology and The BIOTRON, University of Western Ontario, London, Ontario, Canada N6A 5B7 (F.B., N.P.A.H., I.E.);

    Institute of Chemistry and Dynamics of the Geosphere (ICG-III): Phytosphere, Forschungszentrum Jülich, 52425 Juelich, Germany (F.B.);

    and Max-Planck-Institut für Molekulare Pflanzenphysiologie, 14476 Golm, Germany (I.E.);

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