Elevated atmospheric CO2 and drought effects on leaf gas exchange properties of barley

2011 ◽  
Vol 144 (1) ◽  
pp. 390-404 ◽  
Author(s):  
Gerard W. Wall ◽  
Richard L. Garcia ◽  
Frank Wechsung ◽  
Bruce A. Kimball
Keyword(s):  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Atmospheric Co2 ◽  
Elevated Atmospheric Co2 ◽  
Exchange Properties ◽  
Drought Effects

scholarly journals Normal Cyclic Variation in CO2 Concentration in Indoor Chambers Decreases Leaf Gas Exchange and Plant Growth

Plants ◽  
2020 ◽  
Vol 9 (5) ◽  
pp. 663
Author(s):  
James Bunce
Keyword(s):  
Stomatal Conductance ◽  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Genetic Material ◽  
Co2 Concentration ◽  
Cyclic Variation ◽  
Indoor Exposure ◽  
Elevated Atmospheric Co2 ◽  
Gas Exchange System ◽  
Opening And Closing

Attempts to identify crop genetic material with larger growth stimulation at projected elevated atmospheric CO2 concentrations are becoming more common. The probability of reductions in photosynthesis and yield caused by short-term variation in CO2 concentration within elevated CO2 treatments in the free-air CO2 enrichment plots raises the question of whether similar effects occur in glasshouse or indoor chamber experiments. These experiments were designed to test whether even the normal, modest, cyclic variation in CO2 concentration typical of indoor exposure systems have persistent impacts on photosynthesis and growth, and to explore mechanisms underlying the responses observed. Wheat, cotton, soybeans, and rice were grown from seed in indoor chambers at a mean CO2 concentration of 560 μmol mol−1, with “triangular” cyclic variation with standard deviations of either 4.5 or 18.0 μmol mol−1 measured with 0.1 s sampling periods with an open path analyzer. Photosynthesis, stomatal conductance, and above ground biomass at 20 to 23 days were reduced in all four species by the larger variation in CO2 concentration. Tests of rates of stomatal opening and closing with step changes in light and CO2, and tests of responses to square-wave cycling of CO2 were also conducted on individual leaves of these and three other species, using a leaf gas exchange system. Reduced stomatal conductance due to larger amplitude cycling of CO2 during growth occurred even in soybeans and rice, which had equal rates of opening and closing in response to step changes in CO2. The gas exchange results further indicated that reduced mean stomatal conductance was not the only cause of reduced photosynthesis in variable CO2 conditions.

Water relations and leaf gas exchange properties in some elite canola (Brassica napus) lines under salt stress

2003 ◽  
Vol 142 (3) ◽  
pp. 307-316 ◽  
Author(s):  
M QASIM ◽  
M ASHRAF ◽  
M AMIR JAMIL ◽  
M Y ASHRAF ◽  
SHAFIQ-UR-REHMAN ◽  
...  
Keyword(s):  
Salt Stress ◽  
Brassica Napus ◽  
Gas Exchange ◽  
Water Relations ◽  
Leaf Gas Exchange ◽  
Exchange Properties
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