期刊
PLANT JOURNAL
卷 90, 期 6, 页码 1144-1155出版社
WILEY
DOI: 10.1111/tpj.13539
关键词
CONSTITUTIVE PHOTOMORPHOGENIC 1; ELONGATED HYPOCOTYL 5; protein degradation; jasmonate; skotomorphogenesis; photomorphogenesis; Arabidopsis
资金
- CAS Key Technology Talent Program
- National Natural Science Foundation of China [31671419, 31401179, 31570268, 31470375]
- Natural Science Foundation of Jiangsu Province [BK20140919]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
- Qing Lan Project
A germinating seedling undergoes skotomorphogenesis to emerge from the soil and reach for light. During this phase, the cotyledons are closed, and the hypocotyl elongates. Upon exposure to light, the seedling rapidly switches to photomorphogenesis by opening its cotyledons and suppressing hypocotyl elongation. The E3 ubiquitin ligase CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1) is critical for maintaining skotomorphogenesis. Here, we report that jasmonate (JA) suppresses hypocotyl elongation and stimulates cotyledon opening in etiolated seedlings, partially phenocopying cop1 mutants in the dark. We also find that JA stabilizes several COP1-targeted transcription factors in a COP1-dependent manner. RNA-seq analysis further defines a JA-light co-modulated and cop1-dependent transcriptome, which is enriched for auxin-responsive genes and genes participating in cell wall modification. JA suppresses COP1 activity through at least two distinct mechanisms: decreasing COP1 protein accumulation in the nucleus; and reducing the physical interaction between COP1 and its activator, SUPPRESSOR OF PHYTOCHROME A-105 1 (SPA1). Our work reveals that JA suppresses COP1 activity to stabilize COP1 targets, thereby inhibiting hypocotyl elongation and stimulating cotyledon unfolding in etiolated Arabidopsis seedlings.
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