ArticleScientific reports2026
CRISPR/Cas9-mediated mutagenesis of SMXL4 alters plant height and yield-related traits in rice (cv. Samkwang).
Article in Scientific 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
Recent climate change and frequent extreme weather events during the maturation period of rice exacerbate lodging and threaten stable production. Samkwang, a widely cultivated rice variety in Korea, is particularly vulnerable to lodging due to its tall stature. To improve lodging tolerance while preserving Samkwang’s elite genetic background, we identified an SMXL4-edited line (smxl4) with reduced culm length and stable growth from a CRISPR/Cas9-edited Samkwang population. The biological function of SMXL4, a clade Ⅳ member of the SMXL (SUPPRESSOR OF MAX2 1-LIKE) family, has not been well characterized in rice. Compared to Samkwang, the smxl4 plants showed reduced plant height, internode length, panicle length, grain number per panicle, and grain weight, while panicle number per plant increased. Transcriptome profiling of elongating internodes at booting and heading stages revealed upregulation of genes associated with cell wall remodeling and defense responses in smxl4 relative to Samkwang. These findings highlight the broad involvement of SMXL4 in rice growth and development and provide insights for breeding lodging tolerant rice cultivars.
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