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Background  A wild-abortive-type (WA) cytoplasmic male sterility (CMS) has been almost exclusively used for breeding three-line hybrid rice. Many  indica  cultivars are known to carry restorer genes for WA-CMS lines and cannot be used as maintainer lines. Especially elite  indica  cultivars IR24 and IR64 are known to be restorer lines for WA-CMS lines, and are used as male parents for hybrid seed production. If we develop CMS IR24 and CMS IR64, the combination of F 1  pairs in hybrid rice breeding programs will be greatly broadened.    Findings  For production of CMS lines and restorer lines of IR24 and IR64, we employed Chinese wild rice (CW)-type CMS/ Restorer of fertility 17  ( Rf17 ) system, in which fertility is restored by a single nuclear gene,  Rf17 . Successive backcrossing and marker-assisted selection of  Rf17  succeeded to produce completely male sterile CMS lines and fully restored restorer lines of IR24 and IR64. CW-cytoplasm did not affect agronomic characteristics.    Conclusions  Since IR64 is one of the most popular mega-varieties and used for breeding of many modern varieties, the CW-CMS line of IR64 will be useful for hybrid rice breeding.    Electronic supplementary material  The online version of this article (doi:10.1186/s12284-016-0097-2) contains supplementary material, which is available to authorized users.

Development of Cytoplasmic Male Sterile IR24 and IR64 Using CW-CMS/Rf17 System