A whole-plant chamber system for parallel gas exchange measurements of Arabidopsis and other herbaceous species

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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The Effect of Spectral Quality on Daily Patterns of Gas Exchange, Biomass Gain, and Water-Use-Efficiency in Tomatoes and Lisianthus: An Assessment of Whole Plant Measurements

Frontiers in Plant Science ◽

10.3389/fpls.2017.01076 ◽

2017 ◽

Vol 8 ◽

Cited By ~ 10

Author(s):

Jason Lanoue ◽

Evangelos D. Leonardos ◽

Xiao Ma ◽

Bernard Grodzinski

Keyword(s):

Gas Exchange ◽

Water Use Efficiency ◽

Water Use ◽

Spectral Quality ◽

Whole Plant ◽

Use Efficiency ◽

Daily Patterns

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Interactive effects of nitrogen and water availabilities on gas exchange and whole-plant carbon allocation in poplar

Tree Physiology ◽

10.1093/treephys/18.7.481 ◽

1998 ◽

Vol 18 (7) ◽

pp. 481-487 ◽

Cited By ~ 23

Author(s):

L. Ibrahim ◽

M. F. Proe ◽

A. D. Cameron

Keyword(s):

Gas Exchange ◽

Carbon Allocation ◽

Interactive Effects ◽

Whole Plant

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Design and testing of twig chambers for ozone fumigation and gas exchange measurements in mature trees

Proceedings of the Royal Society of Edinburgh Section B Biological Sciences ◽

10.1017/s0269727000014561 ◽

1994 ◽

Vol 102 ◽

pp. 541-546 ◽

Cited By ~ 5

Author(s):

Wilhelm M. Havranek ◽

Gerhard Wieser

Keyword(s):

Gas Exchange ◽

Net Photosynthesis ◽

Ambient Air ◽

Field Conditions ◽

Chamber System ◽

Mature Trees ◽

Diurnal Courses ◽

Controlled Conditions ◽

Design And Testing

SynopsisA twig chamber system was developed for the exposure of mature trees to ozone (O3) under field conditions. The fumigation system allowed the exact control of O3 concentrations in the chambers, the measurement of O3 uptake as well as gas exchange measurements under ambient and controlled conditions during and after O3 fumigation. Because of differences in individual twigs the system should provide the exposure of replicates to different O3 treatments. Tests showed that temperature, humidity and O3 concentrations inside the chambers were comparable with diurnal courses observed in the field. Comparative gas exchange measurements indicated that there were no differences in net photosynthesis and conductance of twigs outside the chambers and twigs which remained within the chambers for 23 weeks receiving ambient air.

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