J Integr Plant Biol. ›› 2018, Vol. 60 ›› Issue (4): 266-269.DOI: 10.1111/jipb.12616

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RPL18aB helps maintain suspensor identity during early embryogenesis

Fei Xie, Hailong Yan, Yang Sun, Yameng Wang, Hong Chen, Wanying Mao, Liyao Zhang, Mengxiang Sun and Xiongbo Peng*   

  1. State Key Laboratory for Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China
  • Received:2017-09-19 Accepted:2017-11-28 Online:2018-05-02 Published:2018-04-20
  • About author:These authors contributed equally to this work.
    *Correspondence: Email: Xiongbo Peng (bobopx@whu.edu.cn)

Abstract:

During embryogenesis, plants are thought to use a mechanism that allows the suspensor to maintain its identity. Here, we reported that RPL18aB is involved in this mechanism in Arabidopsis thaliana. The suspensor cells proliferated in rpl18aB and formed a multicellular structure rather than undergo programmed cell death, as in wild type. Suspensors of rpl18aB expressed the embryo proper marker, DRN::GFP, but not the suspensor marker, WOX8::GFP. In addition, auxin accumulated throughout the suspensors of rpl18aB proembryos. Suspensor‐specific expression of RPL18aB could rescue the cell proliferation defects in rpl18aB suspensors. These findings supported a role for RPL18aB in maintaining suspensor identity.

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