Oryza sativa Baby Boom1 converts the developmental fate of rice egg cells from gametic into somatic status
<i>Oryza sativa</i> BABY BOOM 1 (OsBBM1), a member of the AP2/ERF family of transcription factors, plays a crucial role in the initiation of the early development of rice zygotes; however, how OsBBM1 is involved in the conversion of cellular and developmental fates of egg cells to zygotes remains unclear. Egg cells isolated from transgenic rice plants expressing <i>OsBBM1</i> under the egg cell-specific promoter showed nuclear and cellular divisions, suggesting that <i>OsBBM1</i> functions in the conversion of the cell fate of egg cells from a quiescent to a proliferative state. Ectopically expressed <i>OsBBM1</i> regulates the expression profiles of genes related to cell cycle and division and microtubule-related machinery. Moreover, although cell wall formation generally occurs around zygotes after gamete fusion, egg cells expressing <i>OsBBM1</i> formed cell walls around the cells before fertilization. These suggest that <i>OsBBM1</i> plays roles in egg cell-zygote conversion and the subsequent proliferative growth of zygotes.
Authors
- Takashi Okamoto (ORCID: https://orcid.org/0000-0001-6531-210X)
- Kentaro Yano (ORCID: https://orcid.org/0000-0001-6584-5934)
- Nobutaka Mitsuda (ORCID: https://orcid.org/0000-0001-5689-3678)
- Masaru Ohme‐Takagi (ORCID: https://orcid.org/0000-0003-2700-4119)
- Hironori Takasaki (ORCID: https://orcid.org/0000-0003-3273-9291)
- Aya Satoh (ORCID: https://orcid.org/0000-0002-8799-9771)
- Shizuka Koshimizu (ORCID: https://orcid.org/0000-0001-9469-3757)
- Kasidit Rattanawong (ORCID: https://orcid.org/0000-0002-4291-4148)
- Atsuko Kinoshita (ORCID: https://orcid.org/0000-0001-9095-389X)
- Miho Ikeda (ORCID: https://orcid.org/0000-0002-2713-5293)
- Yoshimi Oshima (ORCID: https://orcid.org/0000-0002-5404-6165)
- Nargis Akter (ORCID: https://orcid.org/0000-0003-1770-5595)
- Shin-Nosuke Masuo
- Takunori Kitta
- Yuna Taki
Institutions
- National Institute of Genetics (JP)
- The Graduate University for Advanced Studies, SOKENDAI (JP)
- Mawlana Bhashani Science and Technology University (BD)
- Kawasaki Hospital (JP)
- Gakushuin University (JP)
- Tokyo Metropolitan University (JP)
- Saitama University (JP)
- National Institute of Advanced Industrial Science and Technology (JP)
- National Cheng Kung University (TW)
- Fukui Prefectural University (JP)
Publication Details
- Journal
- iScience
- Published
- 2025-09-23
- DOI
- https://doi.org/10.1016/j.isci.2025.113621
- Primary Topic
- Plant Genetic and Mutation Studies
- Type
- article
- Field-Weighted Citation Impact
- 0.00