Analysis of leaf wetting effects on gas exchanges of corn using a whole-plant chamber system
Analysis of leaf wetting effects on gas exchanges of corn using a whole-plant chamber system
复制标题
DOI：
10.17221/186/2018-pse
复制
发表时间：
2018
影响因子：
2.4
通讯作者：
D. Yasutake;G. Yokoyama;Kyosuke Maruo;Yueru Wu;Weizheng Wang;M. Mori;M. Kitano
中科院分区：
文献类型：
--
作者：
D. Yasutake;G. Yokoyama;Kyosuke Maruo;Yueru Wu;Weizheng Wang;M. Mori;M. Kitano
王文忠，王文忠，王文忠，王文忠，北野M.(2018)：叶片湿润对玉米叶片气体交换的影响分析。植物土壤环境。中文信息学报，64(4):233-239。研制了一种配备蒸腾液流量计的全株室系统，用于在叶片湿润的情况下测量蒸腾速率。在初步试验中，测量了湿润和非湿润植物的蒸腾速率和/或蒸发速率的动态，并进行了比较，证明了该测量系统的有效性。利用该系统分析了土壤轻度水分胁迫条件下（土壤体积含水量为9.7%）叶片润湿对玉米气体交换的影响。叶片湿润通过降低叶片温度降低了叶片内的蒸汽压，但增加了空气中的蒸汽压；因此，作为蒸腾驱动力的叶片与空气之间的蒸汽压差在湿润植物中显著降低。结果表明，叶片湿润使蒸腾速率降低44%，叶片导度（气孔孔径指标）增加。叶片湿润导致叶片导度增加，使光合速率提高30%，从而提高水分利用效率（2.4倍）。这些结果表明，夜间露水形成的早晨叶片湿润可能对半干旱地区的作物生产有利。
Yasutake D., Yokoyama G., Maruo K., Wu Y.R., Wang W.Z., Mori M., Kitano M. (2018): Analysis of leaf wetting effects on gas exchanges of corn using a whole-plant chamber system. Plant Soil Environ., 64: 233–239. A whole-plant chamber system equipped with a transpiration sap flow meter was developed for measuring the transpiration rate even if leaves are wetted. A preliminary experiment in which dynamics of transpiration rate and/ or evaporation rate of wetted and non-wetted plants were measured and compared with each other demonstrated the validity of the measurement system. The system was then used to analyse leaf wetting effects on gas exchange of corn under slight water stress conditions of soil (a volumetric soil water content of 9.7%). Leaf wetting decreased vapour pressure in leaves by decreasing leaf temperature but it increased vapour pressure in the air; therefore, vapour pressure difference between leaves and air, as a driving force of transpiration, was significantly lower in wetted plant. As a result, transpiration rate decreased by 44% and leaf conductance as an index of stomatal aperture was increased by leaf wetting. Such increasing leaf conductance due to leaf wetting increased the photosynthetic rate by 30% and therefore it improved water use efficiency (2.4 times). These results suggest that morning leaf wetting due to night time dew formation may have an advantage in crop production in semi-arid regions.