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Starch degradation

journal contribution
posted on 2023-05-18, 11:22 authored by Smith, AM, Zeeman, SC, Steven SmithSteven Smith
Recent research reveals that starch degradation in Arabidopsis leaves at night is significantly different from the “textbook” version of this process. Although parts of the pathway are now understood, other parts remain to be discovered. Glucans derived from starch granules are hydrolyzed via β-amylase to maltose, which is exported from the chloroplast. In the cytosol maltose is the substrate for a transglucosylation reaction, producing glucose and a glucosylated acceptor molecule. The enzyme that attacks the starch granule to release glucans is not known, nor is the nature of the cytosolic acceptor molecule. An Arabidopsis-type pathway may operate in leaves of other species, and in nonphotosynthetic organs that accumulate starch transiently. However, in starch-storing organs such as cereal endosperms and legume seeds, the process differs from that in Arabidopsis and may more closely resemble the textbook pathway. We discuss the differences in relation to the biology of each system.


Publication title

Annual Review of Plant Biology








School of Natural Sciences


Annual Reviews

Place of publication

United States of America

Rights statement

Copyright 2005 Annual Reviews

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  • Restricted

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Expanding knowledge in the biological sciences

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