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wrinkled1: A Novel, Low-Seed-Oil Mutant of Arabidopsis with a Deficiency in the Seed-Specific Regulation of Carbohydrate Metabolism1

Nicole Focks and Christoph Benning*

Institut für Genbiologische Forschung Berlin GmbH, Ihnestrasse 63, 14195 Berlin, Germany (N.F., C.B.); and Department of Biochemistry, Michigan State University, East Lansing, Michigan 48824-1319 (C.B.)

During oil deposition in developing seeds of Arabidopsis, photosynthate is imported in the form of carbohydrates into the embryo and converted to triacylglycerols. To identify genes essential for this process and to investigate the molecular basis for the developmental regulation of oil accumulation, mutants producing wrinkled, incompletely filled seeds were isolated. A novel mutant locus, wrinkled1 (wri1), which maps to the bottom of chromosome 3 and causes an 80% reduction in seed oil content, was identified. Wild-type and homozygous wri1 mutant plantlets or mature plants were indistinguishable. However, developing homozygous wri1 seeds were impaired in the incorporation of sucrose and glucose into triacylglycerols, but incorporated pyruvate and acetate at an increased rate. Because the activities of several glycolytic enzymes, in particular hexokinase and pyrophosphate-dependent phosphofructokinase, are reduced in developing homozygous wri1 seeds, it is suggested that WRI1 is involved in the developmental regulation of carbohydrate metabolism during seed filling.

1   This work was financially supported in part by the Deutsche Forschungsgemeinschaft (grant nos. Be 1591/2-1 and Be 1591/2-2) and by the Bundesminister für Bildung und Forschung (grant no. 0311024).
*   Corresponding author; e-mail benning{at}pilot.msu.edu; fax 1-517-353-9334.

Plant Physiol. (1998) 118: 91-101
Copyright Clearance Center:   0032-0889/98/118//11
© 1998 American Society of Plant Physiologists




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