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Mesophyll conductance to CO2 and Rubisco as targets for improving intrinsic water use efficiency in C3 plants

AutorFlexas, Jaume; Díaz-Espejo, Antonio ; Niinemets, Ü.
Palabras claveAquaporins
Carbonic anhydrase
Gene modification
Leaf anatomy
Mesophyll conductance
Stomatal conductance
Stomatal manipulation
Fecha de publicaciónmay-2016
EditorJohn Wiley & Sons
CitaciónPlant Cell and Environment 39: 965–982 (2016)
ResumenWater limitation is a major global constraint for plant productivity that is likely to be exacerbated by climate change. Hence, improving plant water use efficiency (WUE) has become a major goal for the near future. At the leaf level, WUE is the ratio between photosynthesis and transpiration. Maintaining high photosynthesis under water stress, while improving WUE requires either increasing mesophyll conductance (gm) and/or improving the biochemical capacity for CO2 assimilation—in which Rubisco properties play a key role, especially in C3 plants at current atmospheric CO2. The goals of the present analysis are: (1) to summarize the evidence that improving gm and/or Rubisco can result in increased WUE; (2) to review the degree of success of early attempts to genetically manipulate gm or Rubisco; (3) to analyse how gm, gsw and the Rubisco's maximum velocity (Vcmax) co-vary across different plant species in well-watered and drought-stressed conditions; (4) to examine how these variations cause differences in WUE and what is the overall extent of variation in individual determinants of WUE; and finally, (5) to use simulation analysis to provide a theoretical framework for the possible control of WUE by gm and Rubisco catalytic constants vis-à-vis gsw under water limitations.
Descripción18 páginas.-- 7 figuras.-- 3 tablas.-- 110referencias.-- Additional Supporting Information may be found in the online version of this article at the publisher’s web-site: http://dx.doi.org/10.1111/pce.12622
Flexas, Jaume et al...
Versión del editorhttp://dx.doi.org/10.1111/pce.12622
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