WRKY30 negatively regulates lateral root development downstream of the RGF1–RGI1 peptide-receptor module in Arabidopsis

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ID: 313949
2026
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Abstract
Small signaling peptides play pivotal roles in coordinating plant growth, development, and immunity. In Arabidopsis, ROOT MERISTEM GROWTH FACTOR 1 (RGF1) and its cognate receptor RGF1 INSENSITIVE 1 (RGI1) suppress lateral root (LR) development by activating the transcription factor PUCHI via mitogen-activated protein kinase signaling. WRKY30 has previously been identified as an early gene strongly induced by RGF1; however, its role in LR regulation remains unclear. Here, we demonstrate that WRKY30 functions downstream of the RGF1-RGI1 module to inhibit LR development. In ProWRKY30:GUS and ProWRKY30:SVnlsTomato lines, RGF1 treatment strongly induced reporter expression in the distal region of primary roots, while this response was markedly reduced in the rgi1 mutant. Furthermore, RGF1 enhanced WRKY30 promoter-fused GUS activity during LR development. Overexpression of WRKY30 under the UBIQUITIN10 or RGI1 promoters suppressed LR initiation in wild-type and rgi1 plants without affecting RGF1-promoted root meristem activity. Conversely, CRISPR-Cas9-generated wrky30 mutants exhibited reduced sensitivity to RGF1-mediated suppression of LR formation. Collectively, these findings indicate WRKY30 as a key downstream component of RGF1-RGI signaling that specifically restricts LR development.
Reference Key
openalex_W7160696946 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Quy Nguyen, Byeong Wook Jeon, Jeong Il Kim, Jungmook Kim
Journal Journal of experimental botany
Year 2026
DOI
10.1093/jxb/erag217
URL
https://doi.org/10.1093/jxb/erag217
Keywords Keywords not found

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