Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Published on January 27, 2006; 10.1104/pp.105.071977

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Received September 27, 2005
Returned for revision November 5, 2005
Accepted January 17, 2006

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 CA 94720

* Corresponding author; email: feldman{at}nature.berkeley.edu.

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 TCA 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 mitochondria function are central to the establishment and maintenance of the QC.




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K. Jiang, C. Schwarzer, E. Lally, S. Zhang, S. Ruzin, T. Machen, S. J. Remington, and L. Feldman
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