ArticleBMC plant biology2025
The RAE1-STOP1 module regulates ABA sensitivity in early seedlings of Arabidopsis.
Article in BMC plant biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The SENSITIVE TO PROTON RHIZOTOXICITY 1 (STOP1) transcription factor plays a pivotal role in maintaining cellular ion balance and governing aluminum tolerance in plants. Abscisic acid (ABA) participates in aluminum tolerance by inducing the expression of several genes that are STOP1 targets. However, the interplay between ABA signaling and STOP1-mediated gene expression remains poorly understood. The F-box protein RAE1, an SCF-type E3 ligase component, recognizes STOP1 and controls its ubiquitination and degradation. This study revealed that exogenous ABA supplementation reduced STOP1 levels by promoting the expression of RAE1. Notably, both RAE1 loss-of-function mutants and STOP1 overexpressing lines showed enhanced sensitivity to exogenous ABA treatment, which correlated with early stage post-transcriptional upregulation of ABSCISIC ACID INSENSITIVE5 (ABI5). Our observations suggest that RAE1 operates as an ABA-responsive factor, exerting control over STOP1 homeostasis to regulate ABA responses in Arabidopsis. Interestingly, the STOP1 dysfunctional alleles exhibit ABA sensitivity despite a reduction in ABI5, with similar expression levels of ABA-responsive genes, except for the ABI5 repressor MFT, compared to the rae1 and STOP1 overexpression lines. This may suggest a bidirectional role of STOP1 in ABA sensitivity and highlights the critical importance of maintaining STOP1 homeostasis to balance growth and stress tolerance.
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