Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Implications of the mesophyll conductance to CO2 for photosynthesis and water-use efficiency during long-term water stress and recovery in two contrasting Eucalyptu sspecies
Year:2014
Research Areas
  • Natural environment,
  • Forest,
  • Plants and animal biology and ecology
Information
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.
International
Si
JCR
Si
Title
Plant Cell and Environment
ISBN
0140-7791
Impact factor JCR
Impact info
Volume
37
Journal number
From page
2470
To page
2490
Month
SIN MES
Ranking
Participants
  • Autor: Francisco Javier Cano Martín (UPM)
  • Autor: Rosa Ana Lopez Rodriguez (UPM)
  • Autor: C Warren
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Genética, Fisiología e Historia Forestal
  • Departamento: Sistemas y Recursos Naturales
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
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