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Rf4 has minor effects on the fertility restoration of wild abortive-type cytoplasmic male sterile japonica (Oryza sativa) lines

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Abstract

Wild abortive (WA)-type cytoplasmic male sterility (CMS) has been exclusively used for breeding three-line hybrid indica rice, but it has not been applied for generating japonica hybrids because of the difficulties related to breeding japonica restorer lines. Determining whether the major restorer-of-fertility (Rf) gene used for indica hybrids can efficiently restore the fertility of WA-type japonica CMS lines may be useful for breeding WA-type japonica restorer lines. In this study, japonica restorer lines for Chinsurah Boro II (BT)-type CMS exhibited varying abilities to restore the fertility of ‘WA-LiuqianxinA’, which is a WA-type japonica CMS line. Additionally, Rf genes for WA-type CMS were identified in the BT-type japonica restorers. Meanwhile, ‘C9083’, which is a BT-type japonica restorer, exhibited a limited ability to restore the fertility of WA-type japonica CMS lines, and a genetic analysis revealed that the fertility restoration was controlled by one locus. The Rf gene was mapped to an approximately 370-kb physical region and was identified as Rf4. Furthermore, Rf gene dosage effects and the temperature influenced the fertility restoration of WA-type japonica CMS lines. This study is the first to confirm that Rf4 has only minor effects on the fertility restoration of WA-type japonica CMS lines. These results may be relevant for the development of WA-type japonica hybrids.

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Acknowledgements

This study was financially supported by the National Key Research and Development Program (2016YFD0101107), the National Basic Research Program of China (2013CBA01405), and the Priority Academic Program Development of Jiangsu Higher Education Institutions. We thank Lesley Benyon, PhD, from Liwen Bianji, Edanz Group China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.

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HZ analyzed the data and drafted the manuscript. XC and LZ evaluated the phenotypes and analyzed the data. HS and YG helped construct the BC population. MG helped design the study. ST designed the study and revised the manuscript. All authors read and approved the final manuscript.

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Correspondence to Shuzhu Tang.

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The authors declare that they have no conflict of interest.

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Zhang, H., Cheng, X., Zhang, L. et al. Rf4 has minor effects on the fertility restoration of wild abortive-type cytoplasmic male sterile japonica (Oryza sativa) lines. Euphytica 214, 49 (2018). https://doi.org/10.1007/s10681-018-2128-0

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