Expression of cyanobacterial ictB in higher plants

Expression of cyanobacterial ictB in higher plants did not enhance photosynthesis.
Expression of cyanobacterial ictB in higher plants did not enhance photosynthesis.
Leonid Asipov
Abstract
In 2005, an article was published (Lieman-Hurwitz 2005) and contained results of comparison between wt plants and
plants transgenic with ictB, protein which was considered to be involved in carbon transport in cyanobacteria
(Bonfil 1998). The idea was to enhance the photosynthesis of plants by elevation of CO2 concentration near the fixation
site. Elevation of photosynthesis causes elevation in the agricultural yield. The results which were presented showed
that the transgenic plants were better than wt under limiting CO2 conditions and the conclusion was that the protein is
good as an agricultural yield enhancer. However, only partial data was presented and it was not clear from the results,
on which conditions exactly, the transgenic plants had advantage. If natural atmosphere CO2 concentration (around 400
µL L-1 CO2) is not considered "limiting", it is not understandable how the protein will enhance the photosynthesis of
agricultural crops under normal conditions. In the current article, the full data from the same research work is presented
and statistical significance test is calculated in every CO2 point, comparing wt and transgenic plants. In such way, it is
shown exactly at which CO2 point the transgenic plants have advantage. The only two points of CO2 at which the
transgenic plants had significant advantage are 50 and 100 µL L-1, values which are too low for normal plant growth
(Gerhart 2010). Second generation of plants (data which was hidden by the author of the original article) showed no
significant difference relative to the wt plants in all the CO2 points. Contrary to the original article, our conclusions are
that the transgenic protein did not improve photosynthesis at most of the CO2 points and should not be used as an
agricultural yield enhancer.

Keywords: ictB, photosynthesis enhancement, gas-exchange, transgenic plants

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