Abstract
Male sterility is an essential trait in hybrid seed production, especially for monoclinous and autogamous food crops. Soybean male-sterile ms1 mutant has been known for more than 50 years and could be instrumental in making hybrid seeds. However, the gene responsible for the male-sterile phenotype has remained unknown. Here, we report the map-based cloning and characterization of the MS1 gene in soybean. MS1 encodes a kinesin protein and localizes to the nucleus, where it is required for the male meiotic cytokinesis after telophase II. We further substantiated that MS1 colocalizes with microtubules and is essential for cell plate formation in soybean male gametogenesis through immunostaining. Both ms1 and CRISPR/Cas9 knockout mutants show complete male sterility but are otherwise phenotypically normal, making them perfect tools for producing hybrid seeds. The identification of MS1 has the practical potential for assembling the sterility system and speeding up hybrid soybean breeding.
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Data availability
Data supporting the findings of this work are available within the paper and its Supplementary Information files. The RNA-seq data supporting this research have been deposited in the NCBI SRA with the accession number PRJNA726823.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (32072084, 31871648, and 31971969). We gratefully acknowledge Zhaosheng Kong from the Institute of Microbiology, Chinese Academy of Sciences, for sharing the pTUB6::mCherry-TUB6 transgenic Arabidopsis seeds and useful discussions. We would like to thank Dr. Ali Muhammad for editing and improving the manuscript.
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Fang, X., Sun, X., Yang, X. et al. MS1 is essential for male fertility by regulating the microsporocyte cell plate expansion in soybean. Sci. China Life Sci. 64, 1533–1545 (2021). https://doi.org/10.1007/s11427-021-1973-0
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DOI: https://doi.org/10.1007/s11427-021-1973-0