Implications of the mesophyll conductance to CO2 for photosynthesis and water-use efficiency during long-term water stress and recovery in two contrasting Eucalyptu species

Cano Martín, Francisco Javier and Lopez Rodriguez, Rosa Ana and Warren, Charles R. (2014). Implications of the mesophyll conductance to CO2 for photosynthesis and water-use efficiency during long-term water stress and recovery in two contrasting Eucalyptu species. "Plant Cell and Environment", v. 37 ; pp. 2470-2490. ISSN 0140-7791. https://doi.org/10.1111/pce.12325.

Description

Title: Implications of the mesophyll conductance to CO2 for photosynthesis and water-use efficiency during long-term water stress and recovery in two contrasting Eucalyptu species
Author/s:
  • Cano Martín, Francisco Javier
  • Lopez Rodriguez, Rosa Ana
  • Warren, Charles R.
Item Type: Article
Título de Revista/Publicación: Plant Cell and Environment
Date: 2014
ISSN: 0140-7791
Volume: 37
Subjects:
Faculty: E.T.S.I. Montes (UPM)
Department: Silvopascicultura [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Water stress (WS) slows growth and photosynthesis (An), but most knowledge comes from short-time studies that do not account for longer term acclimation processes that are especially relevant in tree species. Using two Eucalyptus species that contrast in drought tolerance, we induced moderate and severe water deficits by withholding water until stomatal conductance (gsw) decreased to two pre-defined values for 24 d, WS was maintained at the target gsw for 29 d and then plants were re-watered. Additionally, we developed new equations to simulate the effect on mesophyll conductance (gm) of accounting for the resistance to refixation of CO2. The diffusive limitations to CO2, dominated by the stomata, were the most important constraints to An. Full recovery of An was reached after re-watering, characterized by quick recovery of gm and even higher biochemical capacity, in contrast to the slower recovery of gsw. The acclimation to long-term WS led to decreased mesophyll and biochemical limitations, in contrast to studies in which stress was imposed more rapidly. Finally, we provide evidence that higher gm under WS contributes to higher intrinsic water-use efficiency (iWUE) and reduces the leaf oxidative stress, highlighting the importance of gm as a target for breeding/genetic engineering.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainAGL2011–25365UnspecifiedUnspecifiedUnspecified
Madrid Regional GovernmentS2009AMB-1668UnspecifiedUnspecifiedUnspecified

More information

Item ID: 35427
DC Identifier: http://oa.upm.es/35427/
OAI Identifier: oai:oa.upm.es:35427
DOI: 10.1111/pce.12325
Deposited by: Memoria Investigacion
Deposited on: 28 May 2015 06:30
Last Modified: 08 May 2019 10:56
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