J Integr Plant Biol ›› 2022, Vol. 64 ›› Issue (10): 1901-1915.DOI: 10.1111/jipb.13336

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  • 收稿日期:2022-06-03 接受日期:2022-08-01 出版日期:2022-10-01 发布日期:2022-10-20

FERONIA is involved in phototropin 1-mediated blue light phototropic growth in Arabidopsis

Chiyu Li1,2,3†, Jia Chen2,3†, Xiaoyan Li2,3, Xin Zhang2,3, Ying Liu2,3, Sirui Zhu2,3, Long Wang2,3, Heping Zheng2,3, Sheng Luan4, Jiada Li1 and Feng Yu2,3,5*   

  1. 1 School of Life Sciences, Central South University, Changsha 410078, China
    2 State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Hunan University, Changsha 410082, China
    3 Hunan Key Laboratory of Plant Functional Genomics and Developmental Regulation, Hunan University, Changsha 410082, China
    4 Department of Plant and Microbial Biology, University of California, Berkeley, CA, 94720, USA
    5 State Key Laboratory of Hybrid Rice, Hunan Hybrid Rice Research Center, Changsha 410125, China

    † These authors contributed equally to this work.
    *Correspondence: Feng Yu (feng_yu@hnu.edu.cn)
  • Received:2022-06-03 Accepted:2022-08-01 Online:2022-10-01 Published:2022-10-20

Abstract: Plant shoot phototropism is triggered by the formation of a light-driven auxin gradient leading to bending growth. The blue light receptor phototropin 1 (phot1) senses light direction, but how this leads to auxin gradient formation and growth regulation remains poorly understood. Previous studies have suggested phot1's role for regulated apoplastic acidification, but its relation to phototropin and hypocotyl phototropism is unclear. Herein, we show that blue light can cause phot1 to interact with and phosphorylate FERONIA (FER), a known cell growth regulator, and trigger downstream phototropic bending growth in Arabidopsis hypocotyls. fer mutants showed defects in phototropic growth, similar to phot1/2 mutant. FER also interacts with and phosphorylates phytochrome kinase substrates, the phot1 downstream substrates. The phot1-FER pathway acts upstream of apoplastic acidification and the auxin gradient formation in hypocotyl under lateral blue light, both of which are critical for phototropic bending growth in hypocotyls. Our study highlights a pivotal role of FER in the phot1-mediated phototropic cell growth regulation in plants.

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