What question did this study set out to answer?

To comprehensively identify the B-type response regulator (B-RR) gene family in tomato and characterize their structural features and expression responses to drought and abscisic acid (ABA).

August 19, 2026PLoS ONEOpen Access

Genome-wide identification of tomato B-RRs gene family and expression analysis in response to ABA and drought

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To comprehensively identify the B-type response regulator (B-RR) gene family in tomato and characterize their structural features and expression responses to drought and abscisic acid (ABA).
Identified and characterized 10 B-RR transcription factor genes (SlRR1 to SlRR10) in tomato through chromosomal localization, gene structure, protein motif, and phylogenetic analyses.
Profiled tissue-specific expression and analyzed promoter cis-elements alongside transcriptional responses to polyethylene glycol (PEG)-induced drought stress and exogenous ABA application.
Identified 10 SlRR genes distributed across eight chromosomes and grouped into three distinct phylogenetic subfamilies exhibiting 4–11 exons and conserved protein motifs.
Observed distinct tissue-specific baseline expression, including meristem-enriched (SlRR1, SlRR2, SlRR5), root-enriched (SlRR3, SlRR4, SlRR9), and fruit-predominant (SlRR7) expression patterns.
Demonstrated significant transcriptional suppression of B-RRs harboring drought- and ABA-responsive promoter elements following PEG-induced drought stress and exogenous ABA treatments.

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Implication

Genome-wide analysis reveals downregulation of ten B-type response regulator genes under drought and abscisic acid treatments in tomato, suggesting key roles in hormone signaling crosstalk.

Cite This Study

Sun et al. (2026) studied this question.

synapsesocial.com/papers/6a85636403308d306e2d6840 https://doi.org/10.1371/journal.pone.0356487

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Implication

Genome-wide analysis reveals downregulation of ten B-type response regulator genes under drought and abscisic acid treatments in tomato, suggesting key roles in hormone signaling crosstalk.

Genome-wide identification of tomato B-RRs gene family and expression analysis in response to ABA and drought

Key Points

Discussion

Implication

Cite This Study

Genome-wide identification of tomato B-RRs gene family and expression analysis in response to ABA and drought

Key Points

Discussion

Implication

Cite This Study

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