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Plant Physiol, March 2000, Vol. 122, pp. 925-932
Auxin Metabolism in the Root Apical Meristem1
Nancy M.
Kerk,2
Keni
Jiang, and
Lewis J.
Feldman*
Department of Plant and Microbial Biology, 111 Koshland Hall,
University of California, Berkeley, California 94720-3102
Within
the root meristem of flowering plants is a group of mitotically
inactive cells designated the quiescent center (QC). Recent work links
the quiescent state to high levels of the growth regulator auxin that
accumulates in the QC via polar transport. This in turn results in
elevated levels of the enzyme ascorbic acid oxidase (AAO), resulting in
a reduction of ascorbic acid (AA) within the QC and mitotic quiescence.
We present evidence for additional interactions between auxin, AAO, and
AA, and report that, in vitro, AAO oxidatively decarboxylates auxin,
suggesting a mechanism for regulating auxin levels within the QC. We
also report that oxidative decarboxylation occurs at the root tip and that an intact root cap must be present for this metabolic event to
occur. Finally, we consider how interaction between auxin and AAO may
influence root development by regulating the formation of the QC.
1
This work was supported by the National Science
Foundation (grant no. IBN-9404842).
2
Present address: Department of Molecular,
Cellular and Developmental Biology, Yale University, New Haven, CT
06520-8104.
*
Corresponding author; e-mail feldman{at}nature.berkeley.edu; fax
510-642-4995.
© 2000 American Society of Plant Physiologists
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