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View Article
AUTHOR
  J-W Lee, D-S Lee, SH Bhoo, J-S Jeon, Y-H Lee, T-R Hahn (2005)
TITLE   Transgenic Arabidopsis plants expressing E. coli pyrophosphatase display both altered carbon partitioning in their source leaves and reduced photosynthetic activity
JOURNAL   Plant Cell Reports. 24: 374-382
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  The Abstract Of The Paper
The effects of the cytosolic expression of E. coli pyrophosphatase (ppa) were investigated in the rosette leaves of transgenic Arabidopsis plants.  During daytime, glucose and fructose were found to accumulate at levels that were approximately two to three fold higher in these plants than in wild type.  Interestingly, however, neither sucrose nor starch levels showed any distinctive build up in transgenic plants except under continuous white light growth conditions, during which they accumulated at high levels.  Additionally, the leaves of transgenic Arabidopsis plants contain two to three fold higher levels of inorganic phosphate and two to six fold higher levels of UDP-glucose than wild type plants during diurnal.  In contrast, triose phosphate contents in the leaves of E. coli ppa transformants were either similar or slightly decreased when compared with wild type leaves. Furthermore, the photosynthetic activity of these transgenic plants was found to be reduced by 20~40% of normal levels.  These results indicate that induction of pyrophosphatase activity in the cytosol affects carbon partitioning between source and sink organs and also that the concomitant increase in Pi caused the accumulation of carbon metabolites and reduced photosynthetic activity.  
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