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Transcriptional profiling of Arabidopsis responses to phytosulfokine (PSK)

ABSTRACT: Our study reveals that phytosulfokine (PSK) promotes plant growth by suppressing defense mechanisms, highlighting a key link between growth regulation and immune response. By demonstrating how PSK downregulates WRKY TFs and associated kinase activity, this research provides valuable insights into plant biology, offering potential strategies for improving crop yield and pathogen resistance. This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE254988 | GEO | 2024/10/17

REPOSITORIES: GEO

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Next Generation Sequencing Facilitates Quantitative Analysis of PSKγ1ox and control Transcriptomes

Project description:Phytosulfokine-α (PSK-α), a sulfated pentapeptide hormone with the sequence YIYTQ, plays important roles in many aspects of plant growth and development. In this study, we identified a pair of putative precursor genes in soybean, GmPSKγ1 and -2, encoding a PSK-like peptide: PSK-γ. Similar to PSK-α in amino acid composition, the sequence of PSK-γ is YVYTQ, and the tyrosines undergo sulfonylation. Treatment of Arabidopsis seedlings with synthetic sulfated PSK-γ significantly enhanced root elongation, indicating that PSK-γ might be a functional analog of PSK-α. Expression pattern analysis revealed that the two GmPSKγ genes, especially GmPSKγ1, are primarily expressed in developing soybean seeds. Heterologous expression of GmPSKγ1 under the control of a seed-specific promoter markedly increased seed size and weight in Arabidopsis, and this promoting effect of PSK-γ on seed growth was further confirmed in transgenic tobacco constitutively expressing GmPSKγ1. Cytological analysis of transgenic Arabidopsis seeds revealed that PSK-γ promotes seed growth by inducing embryo cell expansion. In addition, transcriptome analysis of GmPSKγ1-expressing Arabidopsis seeds suggested that PSK-γ signaling may regulate cell wall loosening to promote cell expansion. Overall, our results shed light on the mechanism by which PSK-γ promotes seed growth, paving the way for the use of this new peptide for biotechnological improvement of crop seed/grain size and yield.

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Transcriptional profiling of Arabidopsis seedlings responses to phytosulfokine (PSK)

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Expression data from OsEBS-transgenic rice B10201 and B10301 and control Guichao2

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