Abstract
The mitochondrial–nuclear interaction is essential for cellular homeostasis and proper function. DNA methylation plays an important role in gene expression regulation, as well as in maintaining genomic stability. Isonuclear-alloplasmic and isoplasmic-allonuclear lines were used as materials in this study. The mitochondrial DNA (mtDNA) and nuclear DNA (nDNA) from maize tassels were used for DNA methylation analysis with high-performance liquid chromatography. The results were as follows. (i) Different mtDNA methylation levels were detected within the isoplasmic-allonuclear lines and varied nDNA methylation levels were also detected among the isonuclear-alloplasmic lines. (ii) From the pollen mother cell stage to the binucleate stage, the change pattern of DNA methylation levels varied among cytoplasmic male sterility (CMS) lines CMS-C, CMS-T, and CMS-S (CMS Charrua, Texas, and USDA, respectively). The DNA methylation level peaked at the tetrad stage for the CMS-C line, at the mononuclear stage for the CMS-...
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