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Pollen tube emergence is mediated by ovary-expressed ALCATRAZ in cucumber

Author

Listed:
  • Zhihua Cheng

    (China Agricultural University)

  • Xiaofeng Liu

    (China Agricultural University)

  • Shuangshuang Yan

    (China Agricultural University)

  • Bin Liu

    (CSIC-IRTA-UAB-UB)

  • Yanting Zhong

    (China Agricultural University)

  • Weiyuan Song

    (China Agricultural University)

  • Jiacai Chen

    (China Agricultural University)

  • Zhongyi Wang

    (China Agricultural University)

  • Gen Che

    (China Agricultural University)

  • Liu Liu

    (China Agricultural University)

  • Ao Ying

    (China Agricultural University)

  • Hanli Lv

    (China Agricultural University)

  • Lijie Han

    (China Agricultural University)

  • Min Li

    (China Agricultural University)

  • Jianyu Zhao

    (China Agricultural University)

  • Junqiang Xu

    (Yunnan Agricultural University)

  • Zhengan Yang

    (Yunnan Agricultural University)

  • Zhaoyang Zhou

    (China Agricultural University)

  • Xiaolan Zhang

    (China Agricultural University)

Abstract

Pollen tube guidance within female tissues of flowering plants can be divided into preovular guidance, ovular guidance and a connecting stage called pollen tube emergence. As yet, no female factor has been identified to positively regulate this transition process. In this study, we show that an ovary-expressed bHLH transcription factor Cucumis sativus ALCATRAZ (CsALC) functions in pollen tube emergence in cucumber. CsALC knockout mutants showed diminished pollen tube emergence, extremely reduced entry into ovules, and a 95% reduction in female fertility. Further examination showed two rapid alkalinization factors CsRALF4 and CsRALF19 were less expressed in Csalc ovaries compared to WT. Besides the loss of male fertility derived from precocious pollen tube rupture as in Arabidopsis, Csralf4 Csralf19 double mutants exhibited a 60% decrease in female fertility due to reduced pollen tube distribution and decreased ovule targeting efficiency. In brief, CsALC regulates female fertility and promotes CsRALF4/19 expression in the ovary during pollen tube guidance in cucumber.

Suggested Citation

  • Zhihua Cheng & Xiaofeng Liu & Shuangshuang Yan & Bin Liu & Yanting Zhong & Weiyuan Song & Jiacai Chen & Zhongyi Wang & Gen Che & Liu Liu & Ao Ying & Hanli Lv & Lijie Han & Min Li & Jianyu Zhao & Junqi, 2023. "Pollen tube emergence is mediated by ovary-expressed ALCATRAZ in cucumber," Nature Communications, Nature, vol. 14(1), pages 1-15, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-35936-z
    DOI: 10.1038/s41467-023-35936-z
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    References listed on IDEAS

    as
    1. Hidenori Takeuchi & Tetsuya Higashiyama, 2016. "Tip-localized receptors control pollen tube growth and LURE sensing in Arabidopsis," Nature, Nature, vol. 531(7593), pages 245-248, March.
    2. Satohiro Okuda & Hiroki Tsutsui & Keiko Shiina & Stefanie Sprunck & Hidenori Takeuchi & Ryoko Yui & Ryushiro D. Kasahara & Yuki Hamamura & Akane Mizukami & Daichi Susaki & Nao Kawano & Takashi Sakakib, 2009. "Defensin-like polypeptide LUREs are pollen tube attractants secreted from synergid cells," Nature, Nature, vol. 458(7236), pages 357-361, March.
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