Leaf wetting mitigates midday depression of photosynthesis in tomato plants
Leaf wetting mitigates midday depression of photosynthesis in tomato plants
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DOI：
10.32615/ps.2019.088
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发表时间：
2019-07
期刊：
影响因子：
2.7
通讯作者：
G. Yokoyama;D. Yasutake;T. Tanizaki;M. Kitano
中科院分区：
文献类型：
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作者：
G. Yokoyama;D. Yasutake;T. Tanizaki;M. Kitano
从植物水分平衡和叶片形态特征两个方面研究了叶片湿润对中午光合作用抑制的影响。未湿润的植株由于蒸腾失水过多，叶片水势较低(-1.3 Mpa)，午间光合作用显著降低，叶片电导率也随之降低。然而，在叶片湿润的植物中没有观察到午休。叶表面与水滴的接触角较小，说明番茄叶片的拒水性较低。而叶片表面的水分在20min内完全干燥，说明水分覆盖对气孔吸收CO2的影响不大。此外，叶片湿润显著降低了蒸发量，有助于维持适当的水分平衡，避免中午气孔关闭，并有助于缓解中午光合作用的抑制。
We studied the effects of leaf wetting on midday depression of photosynthesis regarding plant water balance and leaf morphological traits. The plants without leaf wetting showed a significant reduction in midday photosynthesis with a concomitant decrease with leaf conductance, because of lower leaf water potential (-1.3 MPa) due to excessive transpiration water loss. However, midday depression was not observed in the plants with leaf wetting. Lower contact angle between leaf surface and water droplet showed that tomato leaves have lower water repellency. However, water on the leaf surface completely dried within 20 min indicating that effect of water coverage on stomata for CO 2 uptake was small. In addition, leaf wetting significantly decreased evaporative demands, which contributed to maintaining appropriate water balance and avoided midday stomatal closure, and it contributed to mitigation of midday depression of photosynthesis.