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A Malvaceae-specific miRNA targeting the newly duplicated GaZIP1L to regulate Zn2+ ion transporter capacity in cotton ovules

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Abstract

MicroRNAs (miRNAs) play critical roles in regulating gene expression in plants, yet their functions underlying cultivated diploid Gossypium arboreum cotton ovule development are largely unknown. Here, we acquired small RNA profiles from G. arboreum ovules and fibers collected at different growth stages, and identified 46 novel miRNAs that accounted for 23.7% of all miRNAs in G. arboreum reported in the latest plant sRNA database. Through analysis of 84 (including 38 conserved) differentially expressed G. arboreum miRNAs, we detected 215 putative protein-coding genes in 26 biological processes as their potential targets. A Malvaceae-specific novel miRNA named gar-miRN44 was found to likely regulate cotton ovule growth by targeting to a newly duplicated Zn2+ ion transporter gene GaZIP1L. During cotton ovule development, gar-miRN44 transcript level decreased sharply after 10 to 15 days post-anthesis (DPA), while that of the GaZIP1L increased significantly, with a concomitant increase of Zn2+ ion concentration in late ovule developmental stages. Molecular dynamics simulation and ion absorption analysis showed that GaZIP1L has stronger Zn2+ ion binding ability than the original GaZIP1, indicating that the newly evolved GaZIP1L may be more suitable for maintaining high Zn2+ ion transport capacity that is likely required for cotton ovule growth via enhanced cellulose synthase activities. Our systematic miRNA profiling in G. arboreum and characterization of gar-miRN44 not only contribute to the understanding of miRNA function in cotton, but also provide potential targets for plant breeding.

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Acknowledgements

This work was supported by grants from the National Natural Science Foundation of China (31690090 and 31690091 to Y.Z.) and the National Postdoctoral Program for Innovative Talent (to G.H.).

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  1. Institute for Advanced Studies, Wuhan University, Wuhan, 430072, China

    Xingpeng Wen & Yuxian Zhu

  2. State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, 100871, China

    Gai Huang, Chenyu Li & Yuxian Zhu

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  1. Xingpeng Wen
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A Malvaceae-specific miRNA targeting the newly duplicated GaZIP1L to regulate Zn2+ ion transporter capacity in cotton ovules, approximately 3.19 MB.

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Wen, X., Huang, G., Li, C. et al. A Malvaceae-specific miRNA targeting the newly duplicated GaZIP1L to regulate Zn2+ ion transporter capacity in cotton ovules. Sci. China Life Sci. 64, 339–351 (2021). https://doi.org/10.1007/s11427-020-1868-9

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