The Arabidopsis thaliana aquaporin AtPIP1;2 is a physiologically relevant CO2 transport facilitator
Article first published online: 21 JUN 2011
© 2011 The Authors. The Plant Journal © 2011 Blackwell Publishing Ltd
The Plant Journal
Volume 67, Issue 5, pages 795–804, September 2011
How to Cite
Heckwolf, M., Pater, D., Hanson, D. T. and Kaldenhoff, R. (2011), The Arabidopsis thaliana aquaporin AtPIP1;2 is a physiologically relevant CO2 transport facilitator. The Plant Journal, 67: 795–804. doi: 10.1111/j.1365-313X.2011.04634.x
- Issue published online: 30 AUG 2011
- Article first published online: 21 JUN 2011
- Accepted manuscript online: 12 MAY 2011 05:01AM EST
- Received 21 March 2011; revised 6 May 2011; accepted 9 May 2011; published online 21 June 2011.
- mesophyll conductance;
- T-DNA insertion line
Cellular exchange of carbon dioxide (CO2) is of extraordinary importance for life. Despite this significance, its molecular mechanisms are still unclear and a matter of controversy. In contrast to other living organisms, plants are physiologically limited by the availability of CO2. In most plants, net photosynthesis is directly dependent on CO2 diffusion from the atmosphere to the chloroplast. Thus, it is important to analyze CO2 transport with regards to its effect on photosynthesis. A mutation of the Arabidopsis thaliana AtPIP1;2 gene, which was characterized as a non-water transporting but CO2 transport-facilitating aquaporin in heterologous expression systems, correlated with a reduction in photosynthesis under a wide range of atmospheric CO2 concentrations. Here, we could demonstrate that the effect was caused by reduced CO2 conductivity in leaf tissue. It is concluded that the AtPIP1;2 gene product limits CO2 diffusion and photosynthesis in leaves.