Sunflecks in the upper canopy: dynamics of light-use efficiency in sun and shade leaves of Fagus sylvatica.
Sunflecks in the upper canopy: dynamics of light-use efficiency in sun and shade leaves of Fagus sylvatica.
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DOI：
10.1111/nph.18222
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发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
Robson TM
中科院分区：
文献类型：
--
作者：
Durand M;Stangl ZR;Salmon Y;Burgess AJ;Murchie EH;Robson TM
日照辐射是一种短暂的直接辐射，它为下层冠层的叶片提供了相当大比例的日辐照度。在这个位置，更快的光合作用诱导将允许更高的日光斑点利用效率，正如文献中通常报道的那样。然而，当日照太少，距离太远时，在树荫下优先进行有效的光合作用可能更有益。我们调查了时间动态的光合诱导，遮荫下的恢复，气孔运动在一个sunfleck，在阳光和遮荫叶的水青冈从三个种源的对比起源。我们发现，阴叶完成完整的诱导在较短的时间比阳叶，但阳叶响应速度比阴叶，由于其更大的幅度的诱导。核心范围种源实现了更快的气孔开在遮荫叶，这可能会允许更好的sunfleck使用效率在密集的冠层和较低的冠层位置。我们的研究结果代表了未来研究冠层光波动的范式转变，引起人们对日光照射对光合作用的普遍重要性的关注，不仅在阴影普遍存在的下层冠层叶片中，而且特别是在上层冠层中，由于冠层开放，更长的日光照射更常见。
Sunflecks are transient patches of direct radiation that provide a substantial proportion of the daily irradiance to leaves in the lower canopy. In this position, faster photosynthetic induction would allow for higher sunfleck‐use efficiency, as is commonly reported in the literature. Yet, when sunflecks are too few and far between, it may be more beneficial for shade leaves to prioritize efficient photosynthesis under shade. We investigated the temporal dynamics of photosynthetic induction, recovery under shade, and stomatal movement during a sunfleck, in sun and shade leaves of Fagus sylvatica from three provenances of contrasting origin. We found that shade leaves complete full induction in a shorter time than sun leaves, but that sun leaves respond faster than shade leaves due to their much larger amplitude of induction. The core‐range provenance achieved faster stomatal opening in shade leaves, which may allow for better sunfleck‐use efficiency in denser canopies and lower canopy positions. Our findings represent a paradigm shift for future research into light fluctuations in canopies, drawing attention to the ubiquitous importance of sunflecks for photosynthesis, not only in lower‐canopy leaves where shade is prevalent, but particularly in the upper canopy where longer sunflecks are more common due to canopy openness.
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影响因子：
5.6
作者：
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