Abstract
Hybrid rice, widely planted in Asia, is pathogen resistant and has superior yields, making it a major contributor to global food security. The two-line hybrid rice system, which utilizes mutants exhibiting photo-/thermo-sensitive genic male sterility (P/TGMS), is the leading hybrid rice breeding technology. Mutations in THERMO-SENSITIVE GENIC MALE STERILE 5 (TMS5) accounts for over 95% of current TGMS lines. We previously found that tms5 carries a mutation in ribonuclease ZS1. Despite its importance for breeding robust rice lines, the mechanism underlying tms5-mediated TGMS remains elusive. Here, we demonstrate that TMS5 is a tRNA 2′,3′-cyclic phosphatase. The tms5 mutation leads to accumulation of 2′,3′-cyclic phosphate (cP)-ΔCCA-tRNAs (tRNAs without 3′ CCA ended with cP), which is exacerbated by high temperatures, and reduction in the abundance of mature tRNAs, particularly alanine tRNAs (tRNA-Alas). Overexpression of tRNA-Alas in the tms5 mutant restores male fertility to 70%. Remarkably, male fertility of tms5 mutant is completely restored at high temperatures by knocking out OsVms1 which encodes the enzyme for cP-ΔCCA-tRNA generation. Our study reveals the mechanism underlying tms5-mediated TGMS in rice and provides mechanistic insight into the further improvement of TGMS in hybrid crop development.
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Data availability
The RcP-RNA-seq and FINE-tRNA-seq data have been deposited in the Genome Sequence Archive in National Genomics Data Center, China National Center for Bioinformation/Beijing Institute of Genomics, Chinese Academy of Sciences (https://ngdc.cncb.ac.cn/gsa/) with the accession number: CRA014058. Crystal structure information of rice TMS5 has been deposited in the PDB (https://www.rcsb.org/) with ID 7XGT. All other data are available in the manuscript or the supplementary information.
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Acknowledgements
We thank Dr. Bo Cao at Shanghai Jiao Tong University, Dr. Chengqi Yi and Dr. Xiaoyu Li at Peking University for helping in constructing tRNA-seq library, and Dr. Xuan Ma at Tianjin Normal University for his assistance with previous bioinformatics analyses. We particularly thank Dr. Falong Lu at the Institute of Genetics & Developmental Biology, CAS and Dr. Yusheng Liu at the Northeast Forestry University for discussing and revising the manuscript. We also thank Mr. Zhenhua Guo at the Institute of Genetics and Developmental Biology, CAS, and Dr. Guocheng Hu at China National Rice Research Institute for rice cultivation. This work was supported by grants from the Biological Breeding-National Science and Technology Major Project of China (2023ZD04073), the National Key R&D Program of China (2020YFA0509900), the National Natural Science Foundation of China (32330019, 32171284, 32170620 and 32370633), the Strategic Priority Research Program of Chinese Academy of Sciences (XDA24010302).
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X.C., Y.C., Y.Y., C.L., and B.Y. conceived and planned the experiments. B.Y., C.L., Y.M., C.Z., J.L., W.L., S.L., W.Y., C.F., P.Q., X.F., X.Z., X.S., J.N., and F.G. performed and analyzed the experiments. J.S. worked on bioinformatics analysis. B.Y., C.L., J.S., Y.Y., Y.C., and X.C. interpreted the results and wrote the manuscript.
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Yan, B., Liu, C., Sun, J. et al. Impaired 2′,3′-cyclic phosphate tRNA repair causes thermo-sensitive genic male sterility in rice. Cell Res 34, 763–775 (2024). https://doi.org/10.1038/s41422-024-01012-4
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DOI: https://doi.org/10.1038/s41422-024-01012-4
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