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Plant Responses to Air Pollution and Global Change pp 133–139Cite as

Expression of cyanobacterial ictB in higher plants enhanced photosynthesis and growth
Judy Lieman-Hurwitz, Leonid Asipov, Shimon Rachmilevitch, Yehouda Marcus & Aaron Kaplan
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Summary
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 activation of the enzyme, in plants grown under low humidity was considerably higher in ictB-expressing plants than in their wild types. The CO2 compensation point in the transgenic plants was lower than in the wild types suggesting a higher CO2 concentration in close proximity to RubisCO. This may explain the higher activation level of RubisCO and enhanced photosynthesis and growth in the transgenic plants. These data indicated a potential use of ictB for the stimulation of crop yield.

Key words
Growth
IctB
Inorganic carbon
Photosynthesis
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References
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Authors and Affiliations
Department of Plant and Environmental Sciences, The Hebrew University of Jerusalem, 91904, Jerusalem, Israel

Judy Lieman-Hurwitz, Leonid Asipov, Shimon Rachmilevitch & Aaron Kaplan

Department of Plant Sciences, Tel Aviv University, 69978, Tel Aviv, Israel

Yehouda Marcus

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Editors and Affiliations
Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan

Kenji Omasa (Professor) (Professor)

Agro-Meteorology Group, National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsukuba, Ibaraki, 305-8604, Japan

Isamu Nouchi (Head) (Head)

Laboratory of Plant Physiology, University of Groningen, P.O. Box 14, 9750 AA, Haren, The Netherlands

Luit J. De Kok (Professor) (Professor)

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© 2005 Springer-Verlag Tokyo

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Lieman-Hurwitz, J., Asipov, L., Rachmilevitch, S., Marcus, Y., Kaplan, A. (2005). Expression of cyanobacterial ictB in higher plants enhanced photosynthesis and growth. In: Omasa, K., Nouchi, I., De Kok, L.J. (eds) Plant Responses to Air Pollution and Global Change. Springer, Tokyo. https://doi.org/10.1007/4-431-31014-2_15

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https://doi.org/10.1007/4-431-31014-2_15

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978-4-431-31014-3

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