ArticleNature communications2025
bZIP factors of the Unfolded Protein Response interact with PIF4 to promote thermomorphogenesis.
Article in Nature communications, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Mutual antagonism between auxin and diacylglycerol acyltransferase 2 regulates high-temperature-induced hypocotyl elongation.The New phytologist · 2026Article
- Rewiring the unfolded protein response for plant growth recovery after stress.Plant communications · 2026Review
- Functional conservation and diversity of phytochrome B and its potential applications in crop improvement.Plant communications · 2026Review
- Evolutionary and pan-genomic analysis of theFrontiers in plant science · 2026Article
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Authors and funding
3 authors.
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Abstract
When Arabidopsis plants are exposed to warm temperatures (e.g., 29 °C), they undergo adaptive growth known as thermomorphogenesis. This process is primarily regulated by the phytochrome B (phyB)-PHYTOCHROME-INTERACTING FACTOR 4 (PIF4) module; however, the potential involvement of additional signaling pathways remains underexplored. Here, we show that warmth triggers endoplasmic reticulum (ER) stress, activating both arms of the Unfolded Protein Response (UPR). Three UPR-associated bZIP transcription factors, bZIP17, bZIP28 and bZIP60, promote hypocotyl growth under warmth in a PIF4-dependent manner. Active bZIP factors form complexes with PIF4 in the nucleus, where they bind to promoter regions of PIF4 and other growth-related genes to enhance their expression. In parallel, bZIPs overexpression counteract the inhibitory effect of phyB on PIF4 stability, thereby reinforcing thermomorphogenic growth. Together, our findings define a regulatory axis that links ER stress, the UPR and thermomorphogenesis, clarifying how plants coordinate physiological and environmental cues to adapt to warming conditions.
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