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September 10, 2025PlantsOpen Access

Two B-Box Proteins, GhBBX21 and GhBBX24, Antagonistically Modulate Anthocyanin Biosynthesis in R1 Cotton

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GhBBX21 promotes anthocyanin accumulation in R1 cotton while GhBBX24 represses it, indicating their antagonistic roles in this process.
Dual-luciferase reporter assays showed that GhBBX21 activated GhPAP1D transcription, whereas GhBBX24 had a repressive effect.
Transgenic Arabidopsis thaliana assays helped confirm the effects of GhBBX proteins on anthocyanin biosynthesis.
The study offers insights into light-responsive regulation of anthocyanin biosynthesis through GhHY5 in cotton.

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Heterologous expression reveals GhBBX21 promotes anthocyanin accumulation in R1 cotton, highlighting GhHY5 mediation.

Li et al. (2025) studied this question.

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