scholarly journals Measurement of Leaf Hydraulic Conductance and Stomatal Conductance and Their Responses to Irradiance and Dehydration Using the Evaporative Flux Method (EFM)

10.3791/4179 ◽  
2012 ◽  
Author(s):  
Lawren Sack ◽  
Christine Scoffoni
Keyword(s):  
Stomatal Conductance ◽  
Hydraulic Conductance ◽  
Flux Method ◽  
Leaf Hydraulic Conductance ◽  
Evaporative Flux

scholarly journals A mutation that eliminates bundle sheath extensions reduces leaf hydraulic conductance, stomatal conductance and assimilation rates in tomato (Solanum lycopersicum)

2014 ◽  
Vol 205 (2) ◽  
pp. 618-626 ◽  
Author(s):  
Agustin Zsögön ◽  
Ana Clarissa Alves Negrini ◽  
Lázaro Eustáquio Pereira Peres ◽  
Hoa Thi Nguyen ◽  
Marilyn C. Ball
Keyword(s):  
Stomatal Conductance ◽  
Solanum Lycopersicum ◽  
Hydraulic Conductance ◽  
Bundle Sheath ◽  
Leaf Hydraulic Conductance

Water transport from stem to stomata: the coordination of hydraulic and gas exchange traits across 33 subtropical woody species

2019 ◽  
Vol 39 (10) ◽  
pp. 1665-1674 ◽  
Author(s):  
Xiaorong Liu ◽  
Hui Liu ◽  
Sean M Gleason ◽  
Guillermo Goldstein ◽  
Shidan Zhu ◽  
...  
Keyword(s):  
Stomatal Conductance ◽  
Gas Exchange ◽  
Water Transport ◽  
Explanatory Power ◽  
Woody Species ◽  
Hydraulic Conductance ◽  
Co2 Assimilation ◽  
Leaf Hydraulic Conductance ◽  
Net Co2 Assimilation ◽  
Leaf Tissues

Abstract Coordination between sapwood-specific hydraulic conductivity (Ks) and stomatal conductance (gs) has been identified in previous studies; however, coordination between leaf hydraulic conductance (Kleaf) and gs, as well as between Kleaf and Ks is not always consistent. This suggests that there is a need to improve our understanding of the coordination among hydraulic and gas exchange traits. In this study, hydraulic traits (e.g., Ks and Kleaf) and gas exchange traits, including gs, transpiration (E) and net CO2 assimilation (Aarea), were measured across 33 co-occurring subtropical woody species. Kleaf was divided into two components: leaf hydraulic conductance inside the xylem (Kleaf-x) and outside the xylem (Kleaf-ox). We found that both Kleaf-x and Kleaf-ox were coordinated with gs and E, but the correlations between Kleaf-ox and gs (or E) were substantially weaker, and that Ks was coordinated with Kleaf-x, but not with Kleaf-ox. In addition, we found that Ks, Kleaf-x and Kleaf-ox together explained 63% of the variation in gs and 42% of the variation in Aarea across species, with Ks contributing the largest proportion of explanatory power, whereas Kleaf-ox contributed the least explanatory power. Our results demonstrate that the coordination between leaf water transport and gas exchange, as well as the hydraulic linkage between leaf and stem, were weakened by Kleaf-ox. This highlights the possibility that water transport efficiencies of stem and leaf xylem, rather than that of leaf tissues outside the xylem, are important determinants of stomatal conductance and photosynthetic capacity across species.

scholarly journals Role of leaf hydraulic conductance in the regulation of stomatal conductance in almond and olive in response to water stress

2016 ◽  
Vol 36 (6) ◽  
pp. 725-735 ◽  
Author(s):  
Virginia Hernandez-Santana ◽  
Celia M. Rodriguez-Dominguez ◽  
J. Enrique Fernández ◽  
Antonio Diaz-Espejo
Keyword(s):  
Water Stress ◽  
Stomatal Conductance ◽  
Hydraulic Conductance ◽  
Leaf Hydraulic Conductance ◽  
Response To Water

scholarly journals Evaporative Flux Method of Leaf Hydraulic Conductance Estimation: Sources of Uncertainty and Reporting Format Recommendation

2021 ◽  
Author(s):  
Xiaoxiao Wang ◽  
Jinfang Zhao ◽  
Jianliang Huang ◽  
Shaobing Peng ◽  
Dongliang Xiong
Keyword(s):  
Environmental Factors ◽  
Influencing Factors ◽  
Hydraulic Conductance ◽  
Accurate Estimation ◽  
Flux Method ◽  
Potential Measurement ◽  
Leaf Hydraulic Conductance ◽  
Leaf Physiology ◽  
Plant Sampling ◽  
And Function

Abstract The accurate estimation of leaf hydraulic conductance (Kleaf) is important for revealing leaf physiology characteristics and function. However, there are some uncertain influencing factors in Kleaf measurement by using evaporation flux method (EFM), a widely used method. In this study, we investigated the potential impacts of plant sampling method, measurement setup, environmental factors, recording instrument, and transpiration steady status identification on Kleaf estimation. Our results indicated that the sampling and rehydration time, the small gravity pressure on leaf, and degassing treatment had limited effects on Kleaf values. Transpiration rate (E) was significantly affected by multiple environmental factors including airflow around leaf, light intensity, and leaf temperature. Kleaf values decreased by 40% from 1000 to 500 µmol m-2 s-1 light intensities and by 15.1% from 27 to 37 oC. In addition, the accurate flow rate (F) steady state identification and the leaf water potential measurement were important for Kleaf estimation. Based on the analysis of influencing factors, we provided a format for reporting the details of the EFM-based Kleaf measurement methods and metadata that future studies could interpret the results in method issue.

scholarly journals Analysis of a hybrid numerical method – decomposing leaf hydraulic conductance

2018 ◽  
Vol 5 (1) ◽  
pp. 98-112
Author(s):  
Frank H. Lynch ◽  
Gretchen B. North ◽  
Breeanna S. Page ◽  
Cullen J. Faulwell
Keyword(s):  
Numerical Method ◽  
Hydraulic Conductance ◽  
Leaf Hydraulic Conductance ◽  
Hybrid Numerical Method
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