Dynamic leaf energy balance: deriving stomatal conductance from thermal imaging in a dynamic environment
Dynamic leaf energy balance: deriving stomatal conductance from thermal imaging in a dynamic environment
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DOI：
10.1093/jxb/erz068
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发表时间：
2019-05-01
影响因子：
6.9
通讯作者：
Lawson, Tracy
中科院分区：
文献类型：
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作者：
Vialet-Chabrand, Silvere;Lawson, Tracy
尽管近年来取得了重大进展，但在波动的条件下，使用热成像来获得生物相关性状仍然是一个挑战。本研究的目的是重新思考目前的方法来处理热像图和推导气孔导度（g（sw））的时间响应的动态能量平衡方程。时间序列热谱图提供了小麦（Triticum aestivum）的g（sw）响应的空间和时间特性的基础。具有已知电导的叶复制品用于验证该方法，并测试我们的模型用于任何材料和任何环境条件下的能力。这些结果强调了尽管叶片呈片状分布，但与叶片平行的气孔协调反应的重要性。在自然环境中，随着光照强度的逐步增加和逐步降低，g（sw）的时间响应呈现多样性和不对称性，这可能是植物在自然环境中应对光照波动时，最大限度地提高单位水分损失的光合作用和避免热胁迫的一种策略。这项研究消除了植物表型平台的一个主要瓶颈，并将为我们进一步了解气孔行为铺平道路。
In spite of the significant progress made in recent years, the use of thermography to derive biologically relevant traits remains a challenge under fluctuating conditions. The aim of this study was to rethink the current method to process thermograms and derive temporal responses of stomatal conductance (g(sw)) using dynamic energy balance equations. Time-series thermograms provided the basis for a spatial and temporal characterization of g(sw) responses in wheat (Triticum aestivum). A leaf replica with a known conductance was used to validate the approach and to test the ability of our model to be used with any material and under any environmental conditions. The results highlighted the importance of the co-ordinated stomatal responses that run parallel to the leaf blade despite their patchy distribution. The diversity and asymmetry of the temporal response of g(sw) observed after a step increase and step decrease in light intensity can be interpreted as a strategy to maximize photosynthesis per unit of water loss and avoid heat stress in response to light flecks in a natural environment. This study removes a major bottleneck for plant phenotyping platforms and will pave the way to further developments in our understanding of stomatal behaviour.