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Published on October 26, 2007; 10.1104/pp.107.108340

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Received August 29, 2007
Accepted October 24, 2007

Arabidopsis seedlings deficient in a plastidic pyruvate kinase are unable to utilize seed storage compounds for germination and establishment

Carl Andre and Christoph Benning *

Department of Energy-Plant Research Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Plant Biology ,Michigan State University, East Lansing, MI 48824, USA; Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, USA

* Corresponding author; email: benning{at}msu.edu.

Catabolism of storage reserves and biosynthesis of metabolites necessary for growth are essential for seed germination and establishment. An Arabidopsis thaliana mutant (pkp1) deficient in plastidic pyruvate kinase (PKp) which is unable to accumulate storage oil to the same extent as wild type shows delayed germination, and seedling establishment is dependent on an exogenous sugar supply. It appears, however, as though these phenotypes are not entirely caused specifically by a lack of seed oil and may be related to reduced PKp activity in germinating seeds. Increasing the sucrose concentration in the medium further inhibits germination of pkp1, possibly due to the accumulation of soluble sugars in seeds. Germinating seeds of pkp1 are unable to metabolize storage oil and cannot utilize applied sucrose for hypocotyl elongation in the dark. Moreover, pkp1 contains less tocopherol and chlorophyll than wild type. Taken together, the results are consistent with a model in which PKp is required for the efficient conversion of sugar into precursors for different anabolic pathways.




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