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First published online January 27, 2006; 10.1104/pp.105.071977

Plant Physiology 140:1118-1125 (2006)
© 2006 American Society of Plant Biologists

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DEVELOPMENT AND HORMONE ACTION

A Role for Mitochondria in the Establishment and Maintenance of the Maize Root Quiescent Center

Keni Jiang, Tracy Ballinger, Daisy Li, Shibo Zhang and Lewis Feldman*

Department of Plant and Microbial Biology, University of California, Berkeley, California 94720

Mitochondria in the oxidizing environment of the maize (Zea mays) root quiescent center (QC) are altered in function, but otherwise structurally normal. Compared to mitochondria in the adjacent, rapidly dividing cells of the proximal root tissues, mitochondria in the QC show marked reductions in the activities of tricarboxylic acid cycle enzymes. Pyruvate dehydrogenase activity was not detected in the QC. Use of several mitochondrial membrane potential ({Delta}{Psi}m) sensing probes indicated a depolarization of the mitochondrial membrane in the QC, which suggests a reduction in the capacity of QC mitochondria to generate ATP and NADH. We postulate that modifications of mitochondrial function are central to the establishment and maintenance of the QC.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Lewis Feldman (feldman{at}nature.berkeley.edu).

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.105.071977.

* Corresponding author; e-mail feldman{at}nature.berkeley.edu; fax 510–642–4995.

Received September 27, 2005; returned for revision January 15, 2006; accepted January 17, 2006.


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