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Plant and Cell Physiology, 1990, Vol. 31, No. 8 1163-1167
© 1990

Article

Developmental Analysis of Steady-State Levels of Cu/Zn and Mn Superoxide Dismutase mRNAs in Maize Tissues

Joseph A. White, Sheri Plant, Ronald E. Cannon, Gregory J. Wadsworth and John G. Scandalios1

Department of Genetics, North Carolina State University Box 7614, Raleigh, NC 27695-7614, U.S.A.

1To whom correspondence and reprint requests should be addressed

The superoxide dismutase (Sod) steady-state mRNA levels in maize seedlings and developing kernels were examined by RNA blot analysis, using Cu/Zn and Mn cDNA probes encoding the cytosolic and mitochondrial SOD isozymes, respectively. The cytosolic (Cu/Zn) Sod steady-state mRNA levels remained relatively constant for the various tissues examined. In contrast, the mRNA levels of the mitochondrial (Mn) SOD-3 isozyme increased in postgerminative scutella. The steady-state mRNA of the Atp2 gene, F1 ATPase ß subunit, was compared to the Sod3 (Mn) mRNA levels. Results of this comparative study suggest that the steady-state levels of mRNAs transcribed by nuclear genes encoding essential mitochondrial proteins are independently regulated throughout development.

(Received April 2, 1990; Accepted September 10, 1990)
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