Your browser doesn't support javascript.
loading
Photosynthetic characterization of Rubisco transplantomic lines reveals alterations on photochemistry and mesophyll conductance.
Galmés, Jeroni; Perdomo, Juan Alejandro; Flexas, Jaume; Whitney, Spencer M.
Afiliação
  • Galmés J; Research Group on Plant Biology under Mediterranean Conditions, Universitat de les Illes Balears, Ctra. de Valldemossa Km.7.5, 07122 Palma, Spain. jeroni.galmes@uib.cat
Photosynth Res ; 115(2-3): 153-66, 2013 Jul.
Article em En | MEDLINE | ID: mdl-23703453
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.
Assuntos

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Ribulose-Bifosfato Carboxilase / Flaveria Idioma: En Ano de publicação: 2013 Tipo de documento: Article País de afiliação: Espanha

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Ribulose-Bifosfato Carboxilase / Flaveria Idioma: En Ano de publicação: 2013 Tipo de documento: Article País de afiliação: Espanha