Analysis of leaf wetting effects on gas exchanges of corn using a whole-plant chamber system

Daisuke Yasutake, Gaku Yokoyama, Kyosuke Maruo, Yueru Wu, Weizhen Wang, Makito Mori and Masaharu Kitano
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Daisuke Yasutake: Faculty of Agriculture, Kyushu University, Fukuoka, Japan
Gaku Yokoyama: Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
Kyosuke Maruo: Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Fukuoka, Japan
Yueru Wu: Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, P.R. China
Weizhen Wang: Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, P.R. China
Makito Mori: Faculty of Agriculture, Kochi University, Nankoku, Kochi, Japan
Masaharu Kitano: Faculty of Agriculture, Kyushu University, Fukuoka, Japan

Plant, Soil and Environment, 2018, vol. 64, issue 5, 233-239

Abstract: 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.

Keywords: dew water; desert ecosystem; photosynthesis; stomatal closure; water stress; Zea mays L (search for similar items in EconPapers)
Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:64:y:2018:i:5:id:186-2018-pse

DOI: 10.17221/186/2018-PSE

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