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. 1991 Apr;95(4):1181–1188. doi: 10.1104/pp.95.4.1181

Mutants of Arabidopsis with Altered Regulation of Starch Degradation 1

Timothy Caspar 1,2,2, Tsan-Piao Lin 1,2,3, Genichi Kakefuda 1,2, Larry Benbow 1,2, Jack Preiss 1,2, Chris Somerville 1,2
PMCID: PMC1077670  PMID: 16668109

Abstract

Mutants of Arabidopsis thaliana (L.) Heynh. with altered regulation of starch degradation were identified by screening for plants that retained high levels of leaf starch after a period of extended darkness. The mutant phenotype was also expressed in seeds, flowers, and roots, indicating that the same pathway of starch degradation is used in these tissues. In many respects, the physiological consequences of the mutations were equivalent to the effects observed in previously characterized mutants of Arabidopsis that are unable to synthesize starch. One mutant line, which was characterized in detail, had normal levels of activity of the starch degradative enzymes α-amylase, β-amylase, phosphorylase, D-enzyme, and debranching enzyme. Thus, it was not possible to establish a biochemical basis for the phenotype, which was due to a recessive mutation at a locus designated sex1 at position 12.2 on chromosome 1. This raises the possibility that hitherto unidentified factors, altered by the mutation, play a key role in regulating or catalyzing starch degradation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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