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Expression of cyanobacterial ictB in higher plants enhanced photosynthesis and growth
Authors
Judy Lieman-Hurwitz, Leonid Asipov, Shimon Rachmilevitch, Yehouda Marcus, Aaron Kaplan
Publication date
2005
Conference
Plant responses to air pollution and global change
Pages
133-139
Publisher
Springer Japan
Description
Under many environmental conditions plant photosynthesis and growth are limited by the availability of CO2 at the site of ribulose 1, 5-bisphosphate carboxylase/oxygenase (RubisCO). We expressed ictB, a gene involved in HCO3 ; accumulation in Synechococcus sp. PCC7942, in higher plants. The transgenic Arabidopsis thaliana and Nicotiana tabacum plants exhibited significantly faster photosynthetic rates than the wild types under limiting, but not under saturating CO2 concentrations. Similar results were obtained in Arabidopsis plants bearing ictB from Anabaena sp. PCC7120. Growth of transgenic A. thaliana plants maintained under low humidity was considerably faster than that of the wild type. There was no difference in the amount of RubisCO or the activity of the enzyme activated in vitro in the wild types and the transgenic plants. In contrast, the in vivo RubisCO activity, without prior …