Literature DB >> 11506365

The contribution of plastidial phosphoglucomutase to the control of starch synthesis within the potato tuber.

A R Fernie1, U Roessner, R N Trethewey, L Willmitzer.   

Abstract

The aim of this work was to evaluate the extent to which plastidial phosphoglucomutase (PGM) activity controls starch synthesis within potato (Solanum tuberosum L. cv. Desirée) tubers. The reduction in the activity of plastidial PGM led to both a correlative reduction in starch accumulation and an increased sucrose accumulation. The control coefficient of plastidial PGM on the accumulation of starch was estimated to approximate 0.24. The fluxes of carbohydrate metabolism were measured by investigating the metabolism of [U-14C]glucose in tuber discs from wild-type and transgenic plants. In tuber discs the control coefficient of plastidial PGM over starch synthesis was estimated as 0.36, indicating that this enzyme exerts considerable control over starch synthesis within the potato tuber.

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Year:  2001        PMID： 11506365     DOI： 10.1007/s004250100521

Source DB:  PubMed          Journal:  Planta        ISSN： 0032-0935            Impact factor:   4.116


  33 in total

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6.  De novo amino acid biosynthesis in potato tubers is regulated by sucrose levels.

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10.  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.

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Journal:  Planta       Date:  2003-02-12       Impact factor: 4.116
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