ArticlePlant communications2026
PHR1-like 7 and phosphatidic acid oppositely regulate TAG degradation and seed oil accumulation in Arabidopsis.
Article in Plant communications, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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Who cites it
2 citing papers in PubMed.
- Multiplex FAD2/FATB Editing Generates Ultra-High-Oleic, Low-Saturate Soybean With Increased Seed Fatty Acid Content.Plant biotechnology journal · 2026Article
- Lipid regulation inFrontiers in plant science · 2026Review
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Authors and funding
7 authors.
Funding
Abstract
Triacylglycerol (TAG) degradation plays an important role in seed oil accumulation, but how this catabolic process is transcriptionally regulated in developing seeds remains poorly understood. Here, we identify a MYB-like helix-turn-helix (HTH) transcriptional regulator, PHR1-like 7 (PHL7), that enhances TAG degradation and decreases seed oil accumulation in Arabidopsis thaliana. PHL7 knockout (KO) plants (phl7) exhibited an approximately 10% increase in seed oil content, whereas PHL7 overexpression (OE) decreased oil content by 8%-13%. Compared with wild-type plants, phl7 displayed reduced expression of TAG degradation genes, including SUGAR-DEPENDENT 1 (SDP1), whereas OE lines exhibited elevated expression. Chromatin immunoprecipitation, electrophoretic mobility shift assays, and transactivation assays demonstrated that PHL7 binds the SDP1 promoter and activates its expression. We further found that PHL7 binds phosphatidic acid (PA), a key intermediate in TAG biosynthesis, and that PA suppresses PHL7 binding to the SDP1 promoter. The lysine residue at position 61 (K61) is required for PA interaction, and introducing the PHL7
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