Developmental Analysis of Steady-State Levels of Cu/Zn and Mn Superoxide Dismutase mRNAs in Maize Tissues |
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Authors: | White Joseph A; Plant Sheri; Cannon Ronald E; Wadsworth Gregory J; Scandalios John G |
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Institution: | Department of Genetics, North Carolina State University Box 7614, Raleigh, NC 27695-7614, U.S.A. |
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Abstract: | The superoxide dismutase (Sod) steady-state mRNA levels in maizeseedlings and developing kernels were examined by RNA blot analysis,using Cu/Zn and Mn cDNA probes encoding the cytosolic and mitochondrialSOD isozymes, respectively. The cytosolic (Cu/Zn) Sod steady-statemRNA levels remained relatively constant for the various tissuesexamined. In contrast, the mRNA levels of the mitochondrial(Mn) SOD-3 isozyme increased in postgerminative scutella. Thesteady-state mRNA of the Atp2 gene, F1 ATPase ß subunit,was compared to the Sod3 (Mn) mRNA levels. Results of this comparativestudy suggest that the steady-state levels of mRNAs transcribedby nuclear genes encoding essential mitochondrial proteins areindependently regulated throughout development. (Received April 2, 1990; Accepted September 10, 1990) |
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