Photosynthesis Research

, Volume 115, Issue 2–3, pp 153–166 | Cite as

Photosynthetic characterization of Rubisco transplantomic lines reveals alterations on photochemistry and mesophyll conductance

  • Jeroni Galmés
  • Juan Alejandro Perdomo
  • Jaume Flexas
  • Spencer M. Whitney
Regular Paper


Improving Rubisco catalysis is considered a promising way to enhance C3-photosynthesis and photosynthetic water use efficiency (WUE) provided the introduced changes have little or no impact on other processes affecting photosynthesis such as leaf photochemistry or leaf CO2 diffusion conductances. However, the extent to which the factors affecting photosynthetic capacity are co-regulated is unclear. The aim of the present study was to characterize the photochemistry and CO2 transport processes in the leaves of three transplantomic tobacco genotypes expressing hybrid Rubisco isoforms comprising different Flaveria L-subunits that show variations in catalysis and differing trade-offs between the amount of Rubisco and its activation state. Stomatal conductance (g s) in each transplantomic tobacco line matched wild-type, while their photochemistry showed co-regulation with the variations in Rubisco catalysis. A tight co-regulation was observed between Rubisco activity and mesophyll conductance (g m) that was independent of g s thus producing plants with varying g m/g s ratios. Since the g m/g s ratio has been shown to positively correlate with intrinsic WUE, the present results suggest that altering photosynthesis by modifying Rubisco catalysis may also be useful for targeting WUE.


Carboxylation CO2 fixation Crop improvement Water use efficiency 



This research was supported by the ARC Fellowship Grant FT0991407 awarded to SMW and the projects AGL2009-07999 and BFU2011-23294 (Plan Nacional, Spain) awarded to JG and JF, respectively. JAP is supported by a FPI Fellowship of the Government of the Balearic Islands.


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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Jeroni Galmés
    • 1
  • Juan Alejandro Perdomo
    • 1
  • Jaume Flexas
    • 1
  • Spencer M. Whitney
    • 2
  1. 1.Research Group on Plant Biology under Mediterranean ConditionsUniversitat de les Illes BalearsPalmaSpain
  2. 2.Plant Sciences Division, Research School of BiologyAustralian National UniversityCanberraAustralia

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