J Integr Plant Biol ›› 2025, Vol. 67 ›› Issue (8): 2214-2228.DOI: 10.1111/jipb.13922

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  • 收稿日期:2025-02-23 接受日期:2025-04-08 出版日期:2025-08-01 发布日期:2025-08-05

FGM1/rPPR4-dependent female gamete maturation is essential for seed development initiation in Arabidopsis

Feng Gong1, Rongxin Lin1, Zonglin Liu1, Xiaorong Huang1‡, Meng‐xiang Sun1* and Xiongbo Peng1,2*   

  1. 1. State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China
    2. Hubei Hongshan Laboratory, Wuhan 430070, China

    ‡State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen 361100, China
    *Correspondences: Meng‐xiang Sun (mxsun@whu.edu.cn); Xiongbo Peng (bobopx@whu.edu.cn, Dr. Peng is fully responsible for the distribution of all materials associated with this article)
  • Received:2025-02-23 Accepted:2025-04-08 Online:2025-08-01 Published:2025-08-05
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (32130031,32270360, 31991201, and 31800265) and the Natural Science Foundation of Hubei Province (2024AFA010, 2024AFE007).

Abstract: Gamete maturation is critical for fertility of both animals and plants; however, the molecular mechanisms underlying these processes remain poorly understood in plants. Here, we report the Female Gamete Maturation 1 (FGM1/rPPR4), a component of mitoribosome large subunit in Arabidopsis directly interacts with the mitochondrial protein GAMETE CELL DEFECTIVE 1 (GCD1) and plays an essential role in female gamete maturation and subsequent zygote–embryo transition and endosperm development. We reveal that FGM1/rPPR4, assisted by GCD1, is an essential factor for female gamete maturation. We also confirm that female gamete maturation is necessary for the capacity of post-fertilization zygote–embryo transition and endosperm development, but not for double fertilization, indicating that essential mechanisms are established during female gamete maturation to provide a molecular basis for seed development initiation and plant fertility.

Key words: egg cell, embryogenesis, gamete maturation, PPR protein

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