scholarly journals Variable Mesophyll Conductance among Soybean Cultivars Sets a Tradeoff between Photosynthesis and Water-Use-Efficiency

2017 ◽  
Vol 174 (1) ◽  
pp. 241-257 ◽  
Author(s):  
Nicholas J. Tomeo ◽  
David M. Rosenthal
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Mesophyll Conductance ◽  
Soybean Cultivars ◽  
Use Efficiency

scholarly journals Consistent Differences in Field Leaf Water-Use Efficiency among Soybean Cultivars

Plants ◽  
2019 ◽  
Vol 8 (5) ◽  
pp. 123 ◽  
Author(s):  
James Bunce
Keyword(s):  
Water Use Efficiency ◽  
Carbon Isotope ◽  
Water Use ◽  
Vapor Pressure Deficit ◽  
Cultivar Differences ◽  
Stomatal Response ◽  
Soybean Cultivars ◽  
Air Temperatures ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency

High intrinsic water-use efficiency (WUEi), the ratio of leaf photosynthesis to stomatal conductance, may be a useful trait in adapting crops to water-limited environments. In soybean, cultivar differences in stomatal response to vapor pressure deficit have not consistently translated into differences in WUEi in the field. In this study, six cultivars of soybeans previously shown to differ in WUEi in indoor experiments were grown in the field in Beltsville, Maryland, and tested for mid-day WUEi on nine clear days during the mid-seasons of two years. Measurement dates were chosen for diverse temperatures, and air temperatures ranged from 21 to 34 °C on the different dates. Air saturation deficits for water vapor ranged from 0.9 to 2.2 kPa. Corrected carbon isotope delta values for 13C (CID) were determined on mature, upper canopy leaves harvested during early pod filling each year. WUEi differed among cultivars in both years and the differences were consistent across measurement dates. Correlations between mean WUEi and CID were not significant in either year. It is concluded that consistent cultivar differences in WUEi exist in these soybean cultivars under field conditions, but that carbon isotope ratios may not be useful in identifying them because of cultivar differences in mesophyll conductance.

scholarly journals Whole‐tree mesophyll conductance reconciles isotopic and gas‐exchange estimates of water‐use efficiency

2020 ◽  
Author(s):  
Teresa E. Gimeno ◽  
Courtney E. Campany ◽  
John E. Drake ◽  
Craig V.M. Barton ◽  
Mark G. Tjoelker ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Water Use Efficiency ◽  
Water Use ◽  
Mesophyll Conductance ◽  
Use Efficiency ◽  
Whole Tree

Drought response of mesophyll conductance in forest understory species - impacts on water-use efficiency and interactions with leaf water movement

2014 ◽  
Vol 152 (1) ◽  
pp. 98-114 ◽  
Author(s):  
Robert Hommel ◽  
Rolf Siegwolf ◽  
Matthias Saurer ◽  
Graham D. Farquhar ◽  
Zachary Kayler ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Water Movement ◽  
Leaf Water ◽  
Forest Understory ◽  
Drought Response ◽  
Mesophyll Conductance ◽  
Understory Species ◽  
Use Efficiency

Variation in mesophyll conductance among Australian wheat genotypes

2014 ◽  
Vol 41 (6) ◽  
pp. 568 ◽  
Author(s):  
Eisrat Jahan ◽  
Jeffrey S. Amthor ◽  
Graham D. Farquhar ◽  
Richard Trethowan ◽  
Margaret M. Barbour
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Photosynthetic Rate ◽  
Genotypic Variation ◽  
Leaf Age ◽  
Triticum Aestivum L ◽  
Mesophyll Conductance ◽  
Wheat Genotypes ◽  
Intrinsic Water Use Efficiency ◽  
Use Efficiency

CO2 diffusion from substomatal intercellular cavities to sites of carboxylation in chloroplasts (mesophyll conductance; gm) limits photosynthetic rate and influences leaf intrinsic water-use efficiency (A/gsw). We investigated genotypic variability of gm and effects of gm on A/gsw among eleven wheat (Triticum aestivum L.) genotypes under light-saturated conditions and at either 2 or 21% O2. Significant variation in gm and A/gsw was found between genotypes at both O2 concentrations, but there was no significant effect of O2 concentration on gm. Further, gm was correlated with photosynthetic rate among the 11 genotypes, but was unrelated to stomatal conductance. The effect of leaf age differed between genotypes, with gm being lower in older leaves for one genotype but not another. This study demonstrates a high level of variation in gm between wheat genotypes; 0.5 to 1.0 μmol m−2 s−1 bar−1. Further, leaf age effects indicate that great care must be taken to choose suitable leaves in studies of genotypic variation in gm and water-use efficiency.

Variability of mesophyll conductance and its relationship with water use efficiency in cotton leaves under drought pretreatment

2016 ◽  
Vol 194 ◽  
pp. 61-71 ◽  
Author(s):  
Ji-Mei Han ◽  
Hao-Feng Meng ◽  
Sai-Yu Wang ◽  
Chuang-Dao Jiang ◽  
Feng Liu ◽  
...  
Keyword(s):  
Water Use Efficiency ◽  
Water Use ◽  
Mesophyll Conductance ◽  
Use Efficiency

scholarly journals Diurnal variation in mesophyll conductance and its influence on modelled water-use efficiency in a mature boreal Pinus sylvestris stand

2019 ◽  
Vol 141 (1) ◽  
pp. 53-63 ◽  
Author(s):  
Zsofia R. Stangl ◽  
Lasse Tarvainen ◽  
Göran Wallin ◽  
Nerea Ubierna ◽  
Mats Räntfors ◽  
...  
Keyword(s):  
Pinus Sylvestris ◽  
Diurnal Variation ◽  
Water Use Efficiency ◽  
Water Use ◽  
Mesophyll Conductance ◽  
Use Efficiency
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