Abstract
Male sterile lines, especially cytoplasmic male sterile (CMS) lines, are extensively used in commercial hybrid seed production. Therefore a better understanding of the genetic basis of fertility restoration for CMS is important for the utility of heterosis in crops. In general, restorer of fertility (Rf) is controlled by one or two major genomic genes, and most of the Rf genes encode proteins containing P type pentatricopeptide repeat (PPR) motifs (Wang et al., 2006; Hu et al., 2012; Tang et al., 2014; Liu et al., 2016).
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