4.8 Article

GENOMES UNCOUPLED1-independent retrograde signaling targets the ethylene pathway to repress photomorphogenesis

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PLANT PHYSIOLOGY
卷 185, 期 1, 页码 67-76

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OXFORD UNIV PRESS INC
DOI: 10.1093/plphys/kiaa015

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资金

  1. FEDER/Ministerio de Ciencia, Innovacion y Universidades -Agencia Estatal de Investigacion [BIO2015-68460-P, PGC2018-099987-B-I00]
  2. Spanish Ministry of Economy and Competitiveness [FJCI-2016-30876]
  3. CERCA Programme/Generalitat de Catalunya [2017SGR-718]
  4. Spanish Ministry of Economy and Competitiveness, through the Severo Ochoa Programme for Centres of Excellence in RD 2016-2019 [SEV-2015-0533]

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In this study, it was found that Arabidopsis seedlings treated with lincomycin exhibited phenotypic similarities to those treated with the ethylene (ET) precursor, with the lincomycin-induced phenotype partially dependent on the ET signaling pathway. Both treatments showed overlap in upregulated gene transcripts, indicating how two apparently different stress responses converge to optimize photomorphogenesis.
When germinating in the light, Arabidopsis (Arabidopsis thaliana) seedlings undergo photomorphogenic development, characterized by short hypocotyls, greening, and expanded cotyledons. Stressed chloroplasts emit retrograde signals to the nucleus that induce developmental responses and repress photomorphogenesis. The nuclear targets of these retrograde signals are not yet fully known. Here, we show that lincomycin-treated seedlings (which lack developed chloroplasts) show strong phenotypic similarities to seedlings treated with ethylene (ET) precursor 1-aminocyclopropane-1-carboxylic acid, as both signals inhibit cotyledon separation in the light. We show that the lincomycin-induced phenotype partly requires a functioning ET signaling pathway, but could not detect increased ET emissions in response to the lincomycin treatment. The two treatments show overlap in upregulated gene transcripts, downstream of transcription factors ETHYLENE INSENSITIVE3 and EIN3-LIKE1. The induction of the ET signaling pathway is triggered by an unknown retrograde signal acting independently of GENOMES UNCOUPLED1. Our data show how two apparently different stress responses converge to optimize photomorphogenesis.

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