TY - JOUR
T1 - Analysis of leaf wetting effects on gas exchanges of corn using a whole-plant chamber system
AU - Yasutake, Daisuke
AU - Yokoyama, Gaku
AU - Maruo, Kyosuke
AU - Wu, Yueru
AU - Wang, Weizhen
AU - Mori, Makito
AU - Kitano, Masaharu
N1 - Funding Information:
Supported by the Japan Society for the Promotion of Science KAKENHI, Grants No. JP15K07668, JP17H04634, JP17H03895; by the JP18K0590, and by the Research Grant for Young Investigators of Faculty of Agriculture, Kyushu University.
Publisher Copyright:
© 2018, Czech Academy of Agricultural Sciences. All rights reserved.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
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U2 - 10.17221/186/2018-PSE
DO - 10.17221/186/2018-PSE
M3 - Article
AN - SCOPUS:85047070082
SN - 1214-1178
VL - 64
SP - 233
EP - 239
JO - Plant, Soil and Environment
JF - Plant, Soil and Environment
IS - 5
ER -