ArticlePlant cell reports2026
Transcription factor LbUBC positively regulates salt gland development and salt tolerance by directly binding to the LbTTG1 promoter and repressing its transcription.
Article in Plant cell reports, 2026. 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
KEY MESSAGE：: LbUBC enhances salt tolerance by promoting salt gland development via repressing LbTTG1, revealing a synergisticregulatory mechanism in Limonium bicolor. In the context of increasingly severe soil salinization, salt-tolerant genetic resources from halophytes show great application potential. In particular, the recretohalophyte Limonium bicolor, which possesses specialized salt gland structures, has become a key model for deciphering the molecular mechanisms underlying salt tolerance and salt gland development. In this study, using LbTTG1-overexpressing and -silenced lines, we demonstrate that LbTTG1 negatively regulates salt-gland development and salt tolerance. Through yeast one-hybrid, EMSA, and dual-luciferase assays, Lb7G33228 (LbUBC) was screened and verified as an upstream transcriptional regulator of LbTTG1. LbUBC enhances salt tolerance in L. bicolor by positively regulating salt-gland development, verified using LbUBC silence and overexpression strains. Interestingly, LbUBC represses the expression of its downstream target LbTTG1, thereby releasing the inhibitory effect of LbTTG1 on salt-gland development. In this manner, LbUBC positively regulates salt-gland development, achieving a dynamic balance in the regulation of salt-gland development and salt tolerance in L. bicolor. This study reveals a synergistic regulatory mechanism involving multiple genes, offering new insights for comprehensively dissecting the molecular regulatory network of salt-gland development.
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