MPI für molekulare Pflanzenphysiologie / Publikationen Pflanzenphysiologie |
|Overexpression of the sucrose transporter SoSUT1 in potato results in alterations in leaf carbon partitioning and in tuber metabolism but has little impact on tuber morphology|
|Authors:||Leggewie, G.; Kolbe, A.; Lemoine, R.; Roessner, U.; Lytovchenko, A.; Zuther, E.; Kehr, J.; Frommer, W. B.; Riesmeier, J. W.; Willmitzer, L.; Fernie, A. R.|
|Date of Publication (YYYY-MM-DD):||2003|
|Title of Journal:||Planta|
|Issue / Number:||1|
|Review Status:||not specified|
|Abstract / Description:||The aim of this work was to examine the consequences of the heterologous expression of a spinach (Spinacia oleracea L.) sucrose transporter (SoSUT1) in potato (Solanum tuberosum L.). Many studies have indicated that reduction of the expression of this class of sucrose transporter has deleterious effects on plant growth and development; however, until now the possibility of improving plant performance by enhancing the expression of this sucrose transporter has not been reported. With this intention we constructed a chimeric construct in which SoSUT1 was cloned in-frame with the myc epitope. We confirmed that this construct, SoSUT1m, was able to mediate sucrose transport by expression in the yeast strain SUSY7. SoSUT1m was expressed in wild-type potato in the sense orientation under the control of the cauliflower mosaic virus 35S promoter to evaluate the effect of an increased constitutive expression of a class-I sucrose transporter. We confirmed that these plants displayed expression of SoSUT1 at both the transcript and protein level and that microsomal fragments isolated from selected lines had an increased sucrose uptake capacity. Analysis of metabolism of these lines indicated that the leaves were characterised by a reduced sucrose level yet exhibited little change in photosynthetic rate. Furthermore, despite the observed increase in sugar (and reduction in amino acid) levels within the tubers, there was little change in either starch content or tuber yield in the transformants. In summary, the genetic manipulation described in this paper resulted in a shift in carbon partitioning in both leaves and tubers and an increased sucrose uptake rate in plasma-membrane vesicles isolated from these lines, but had little impact on tuber metabolism or morphology. [References: 45] 45|
|Free Keywords:||Plasma-membrane vesicles. Starch synthesis. Sieve elements.
; Expression. Protein. Gene. Accumulation. Inhibition.
; Phosphoglucomutase. Identification.
; Plant Sciences in Current Contents(R)/Agricultural, Biology &
; Environmental Sciences
; Animal & Plant Sciences in Current Contents(R)/Life Sciences.
; 2003 week 28
|External Publication Status:||published|
|Communicated by:||N. N.|
|Affiliations:||MPI für molekulare Pflanzenphysiologie/Molekulare Physiologie/AG Kehr|
MPI für molekulare Pflanzenphysiologie/Molekulare Physiologie/AG Willmitzer/Fernie
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