GIMENO, Teresa E.; SAAVEDRA, Noelia; OGÉE, Jérôme; MEDLYN, Belinda E.; WINGATE, Lisa

doi:10.1093/jxb/erz020

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GIMENO, Teresa E.
Interactions Sol Plante Atmosphère [UMR ISPA]

SAAVEDRA, Noelia
Interactions Sol Plante Atmosphère [UMR ISPA]

OGÉE, Jérôme
Interactions Sol Plante Atmosphère [UMR ISPA]

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Journal of Experimental Botany. 2019, vol. 70, n° 5, p. 1639-1651

Oxford University Press (OUP)

Résumé en anglais

The primary function of stomata is to minimize plant water loss while maintaining CO2 assimilation. Stomatal water loss incurs an indirect cost to photosynthesis in the form of non-stomatal limitations (NSL) via reduced carboxylation capacity (CAP) and/or mesophyll conductance (MES). Two optimal formulations for stomatal conductance (gs) arise from the assumption of each type of NSL. In reality, both NSL could coexist, but one may prevail for a given leaf ontogenetic stage or plant functional type, depending on leaf morphology. We tested the suitability of two gs formulations (CAP versus MES) on species from six plant functional types (C4 crop, C3 grass, fern, conifer, evergreen, and deciduous angiosperm trees). MES and CAP parameters (the latter proportional to the marginal water cost to carbon gain) decreased with water availability only in deciduous angiosperm trees, while there were no clear differences between leaf ontogenetic stages. Both CAP and MES formulations fit our data in most cases, particularly under low water availability. For ferns, stomata appeared to operate optimally only when subjected to water stress. Overall, the CAP formulation provided a better fit across all species, suggesting that sub-daily stomatal responses minimize NSL by reducing carboxylation capacity predominantly, regardless of leaf morphology and ontogenetic stage.< Réduire

Mots clés

stomatal conductance

transpiration

Mots clés en anglais

Drought

fern

mesophyll conductance

ontogeny

optimization

photosynthesis

plant functional type

water use efficiency

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A novel optimization approach incorporating non-stomatal limitations predicts stomatal behaviour in species from six plant functional types

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