English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/97417
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Is stomatal conductance optimized over both time and space in plant crowns? A field test in grapevine (Vitis vinifera)

AuthorsBuckley, Thomas N.; Martorell, Sebastià; Díaz-Espejo, Antonio ; Tomàs, Magdalena ; Medrano Gil, Hipólito
KeywordsBoundary layer
Carbon water balance
OptimizationStomata; Water-use efficiency
Stomata
Water-use efficiency
Issue DateMay-2014
PublisherJohn Wiley & Sons
CitationPlant Cell and Environment (2014)
AbstractCrown carbon gain is maximized for a given total water loss if stomatal conductance (gs) varies such that the marginal carbon product of water (∂A/∂E) remains invariant both over time and among leaves in a plant crown, provided the curvature of assimilation rate (A) versus transpiration rate (E) is negative. We tested this prediction across distinct crown positions in situ for the first time by parameterizing a biophysical model across 14 positions in four grapevine crowns (Vitis vinifera), computing optimal patterns of gs and E over a day and comparing these to the observed patterns. Observed water use was higher than optimal for leaves in the crown interior, but lower than optimal in most other positions. Crown carbon gain was 18% lower under measured gs than under optimal gs. Positive curvature occurred in 39.6% of cases due to low boundary layer conductance (gbw), and optimal gs was zero in 11% of cases because ∂A/∂E was below the target value at all gs. Some conclusions changed if we assumed infinite gbw, but optimal and measured E still diverged systematically in time and space. We conclude that the theory's spatial dimension and assumption of positive curvature require further experimental testing
Description15 páginas.-- 13 figuras.-- 1 tabla.-- 64 referencias
Publisher version (URL)http://dx.doi.org/10.1111/pce.12343
URIhttp://hdl.handle.net/10261/97417
DOI10.1111/pce.12343
ISSN0140-7791
E-ISSN1365-3040
Appears in Collections:(IRNAS) Artículos
Files in This Item:
File Description SizeFormat 
Is_stomatal_conductance_optimised.pdf723,81 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.