scholarly journals Leaf anatomy mediates coordination of leaf hydraulic conductance and mesophyll conductance to CO2inOryza

2016 ◽  
Vol 213 (2) ◽  
pp. 572-583 ◽  
Author(s):  
Dongliang Xiong ◽  
Jaume Flexas ◽  
Tingting Yu ◽  
Shaobing Peng ◽  
Jianliang Huang
Keyword(s):  
Leaf Anatomy ◽  
Hydraulic Conductance ◽  
Mesophyll Conductance ◽  
Leaf Hydraulic Conductance

scholarly journals Effects of Pinus taeda leaf anatomy on vascular and extravascular leaf hydraulic conductance as influenced by N-fertilization and elevated CO2

2016 ◽  
Vol 3 ◽  
pp. e007 ◽  
Author(s):  
Jean-Christophe Domec ◽  
Sari Palmroth ◽  
Ram Oren
Keyword(s):  
Water Potential ◽  
Pinus Taeda ◽  
Leaf Anatomy ◽  
Environmental Changes ◽  
Water Movement ◽  
Stomatal Closure ◽  
Hydraulic Conductance ◽  
N Availability ◽  
Leaf Hydraulic Conductance ◽  
Bordered Pits

Silvicultural practices (e.g., nitrogen addition through fertilization) and environmental changes (e.g., elevated [CO2]) may alter needle structure, impacting mass and energy exchange between the biosphere and atmosphere through alteration of stomatal function. Hydraulic resistances in leaves, controlling the mass and energy exchanges, occur both in the xylem and in the flow paths across the mesophyll to evaporation sites, and therefore largely depends on the structure of the leaf. We used the Free-Air Carbon dioxide Enrichment (FACE) experiment, providing a unique setting for assessing the interaction effects of [CO2] and nitrogen (N) supply to examine how leaf morphological and anatomical characteristics control leaf hydraulic conductance (Kleaf) of loblolly pine (Pinus taeda L.) trees subjected to ambient or elevated (+200 ppmv) CO2 concentrations (CO2a and CO2e, respectively) and to soil nitrogen amendment (N). Our study revealed that CO2e decreased the number of tracheids per needle, and increased the distance from the xylem vascular bundle to the stomata cavities, perturbing the leaf hydraulic system. Both treatments induced a decrease in Kleaf, and CO2e also decreased leaf extravascular conductance (Kextravascular), the conductance to water flow from the xylem to the leaf-internal air space. Decline in Kleaf under CO2e was driven by the decline in Kextravascular, potentially due to longer path for water movement through the mesophyll, explaining the decline in stomatal conductance (gs) observed under CO2e. This suggests that the distance from vascular conduits to stomata sub-cavity was a major constraint of leaf water transport. Across treatments our results showed that needle vein conductivity was slightly more limited by the lumen than by the bordered-pits, the latter accounting for 30-45% of vein resistance. CO2e-induced reduction in Kleaf was also consistent with an increased resistance to xylem collapse due to thicker cell wall. In addition, stomatal closure corresponded to the water potential inducing a reduction in 50% of leaf vascular conductance (Kvascular) via xylem wall rupture. The water potential that was estimated to induce complete xylem wall collapse was related to the water potential at turgor loss. Our study provided a framework for understanding the interaction between CO2e and N availability in affecting leaf anatomy, and the mechanisms for the response of Kleaf to the treatments. These mechanisms can be incorporated into predictive models of gs, critical for estimating forest productivity in water limited environments in current and future climates and a landscape composed of sites of a range in soil N fertility. 

scholarly journals The Péclet effect on leaf water enrichment correlates with leaf hydraulic conductance and mesophyll conductance for CO2

2011 ◽  
Vol 35 (3) ◽  
pp. 611-625 ◽  
Author(s):  
JUAN PEDRO FERRIO ◽  
ALÍCIA POU ◽  
IGOR FLOREZ-SARASA ◽  
ARTHUR GESSLER ◽  
NAOMI KODAMA ◽  
...  
Keyword(s):  
Hydraulic Conductance ◽  
Leaf Water ◽  
Mesophyll Conductance ◽  
Leaf Hydraulic Conductance

Leaf hydraulic conductance and mesophyll conductance are not closely related within a single species

2017 ◽  
Vol 40 (2) ◽  
pp. 203-215 ◽  
Author(s):  
Karen E. Loucos ◽  
Kevin A. Simonin ◽  
Margaret M. Barbour
Keyword(s):  
Single Species ◽  
Hydraulic Conductance ◽  
Mesophyll Conductance ◽  
Leaf Hydraulic Conductance

scholarly journals Leaf mesophyll conductance and leaf hydraulic conductance: an introduction to their measurement and coordination

2013 ◽  
Vol 64 (13) ◽  
pp. 3965-3981 ◽  
Author(s):  
Jaume Flexas ◽  
Christine Scoffoni ◽  
Jorge Gago ◽  
Lawren Sack
Keyword(s):  
Hydraulic Conductance ◽  
Mesophyll Conductance ◽  
Leaf Hydraulic Conductance ◽  
Leaf Mesophyll

scholarly journals C 4 grasses adapted to low precipitation habitats show traits related to greater mesophyll conductance and lower leaf hydraulic conductance

2020 ◽  
Vol 43 (8) ◽  
pp. 1897-1910
Author(s):  
Varsha S. Pathare ◽  
Balasaheb V. Sonawane ◽  
Nouria Koteyeva ◽  
Asaph B. Cousins
Keyword(s):  
Hydraulic Conductance ◽  
Mesophyll Conductance ◽  
Leaf Hydraulic Conductance ◽  
Low Precipitation
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