Diurnal depression in leaf hydraulic conductance at ambient and elevated [CO2] reveals anisohydric water management in field-grown soybean and possible involvement of aquaporins

2015 ◽  
Vol 116 ◽  
pp. 39-46 ◽  
Author(s):  
Anna M. Locke ◽  
Donald R. Ort
Keyword(s):  
Water Management ◽  
Elevated Co2 ◽  
Hydraulic Conductance ◽  
Leaf Hydraulic Conductance

scholarly journals Soybean leaf hydraulic conductance does not acclimate to growth at elevated [CO2] or temperature in growth chambers or in the field

2013 ◽  
Vol 112 (5) ◽  
pp. 911-918 ◽  
Author(s):  
Anna M. Locke ◽  
Lawren Sack ◽  
Carl J. Bernacchi ◽  
Donald R. Ort
Keyword(s):  
Elevated Co2 ◽  
Hydraulic Conductance ◽  
Leaf Hydraulic Conductance ◽  
Soybean Leaf ◽  
Growth Chambers

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

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 Leaf Hydraulic Conductance for a Tank Bromeliad: Axial and Radial Pathways for Moving and Conserving Water

2013 ◽  
Vol 4 ◽  
Author(s):  
Gretchen B. North ◽  
Frank H. Lynch ◽  
Franklin D. R. Maharaj ◽  
Carly A. Phillips ◽  
Walter T. Woodside
Keyword(s):  
Hydraulic Conductance ◽  
Leaf Hydraulic Conductance ◽  
Tank Bromeliad

scholarly journals Gas exchange recovery following natural drought is rapid unless limited by loss of leaf hydraulic conductance: evidence from an evergreen woodland

2017 ◽  
Vol 215 (4) ◽  
pp. 1399-1412 ◽  
Author(s):  
Robert P. Skelton ◽  
Timothy J. Brodribb ◽  
Scott A. M. McAdam ◽  
Patrick J. Mitchell
Keyword(s):  
Gas Exchange ◽  
Hydraulic Conductance ◽  
Leaf Hydraulic Conductance

Identification of QTLs associated with limited leaf hydraulic conductance in soybean

Euphytica ◽  
2011 ◽  
Vol 186 (3) ◽  
pp. 679-686 ◽  
Author(s):  
V. Carpentieri-Pipolo ◽  
A. E. Pipolo ◽  
H. Abdel-Haleem ◽  
H. R. Boerma ◽  
T. R. Sinclair
Keyword(s):  
Hydraulic Conductance ◽  
Leaf Hydraulic Conductance
Sign in / Sign up

Export Citation Format

Share Document