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The TCP transcription factor RmTCP5 shapes leaf development by modulating auxin and cytokinin homeostasis in Rosa multiflora
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DOI：10.1016/j.jplph.2026.154755.png)
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Abstract
En 中文
Leaf morphology is a critical trait for plant development and environmental adaptation, governed by an interplay of genetic and environmental factors. Members of the TCP transcription factor family are key regulators of plant growth, with specific roles in controlling leaf shape. While functions of TCP genes have been well characterized in model species, their regulatory mechanisms within the genus Rosa remain largely undefined. This study elucidated the role of a CIN-clade TCP gene, RmTCP5, in R. multiflora. Functional analyses were conducted using heterologous systems (Arabidopsis and tomato) and a homologous system (rose). The results showed that RmTCP5 overexpression led to significant alterations in leaf shape, including reduced leaf area, increased leaf length/width ratio, and decreased leaf serrations. Transcriptome profiling of transgenic Arabidopsis and rose leaves revealed significant changes in the expression of genes associated with auxin and cytokinin signaling pathways. Furthermore, yeast one-hybrid (Y1H) and dual-luciferase reporter (DLR) assays established that RmTCP5 could bind to and suppress the expression of RhYUC5 and RhCKX5 genes. These findings identify RmTCP5 as a key regulator of leaf morphology in R. multiflora, providing new insights into the evolutionary conservation and specific function of TCP genes.
Keywords:
Rosa multiflora
RmTCP5
leaf development
Serrations
Auxin
Cytokinin
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