ArticleThe Plant cell2024
Strigolactone-induced degradation of SMXL7 and SMXL8 contributes to gibberellin- and auxin-mediated fiber cell elongation in cotton.
Article in The Plant cell, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers.
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Who cites it
9 citing papers in PubMed.
- A group of TCP transcription factors is a missing link in strigolactone signaling.Journal of integrative plant biology · 2026Article
- Towards an integrated molecular understanding of plant hormones.Journal of integrative plant biology · 2026Review
- Branch architecture and flowering time are separately regulated by GhFL and GhSP2 in cotton.The Plant journal : for cell and molecular biology · 2026Article
- Genome-Wide Identification and Characterization of theInternational journal of molecular sciences · 2026Article
- A GhSnRK10-GhRopGEF5-GhROP10 signaling pathway regulates cotton fiber cell growth.Plant communications · 2025Article
- An alpha/beta-hydrolase-like gene (GhABH) is identified to be responsible for fiber quality from a multi-effect quantitative trait locus (QTL) on chromosome A06 of upland cotton.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2025Article
- Genetic basis and role of exotic accessions in cultivated cotton fiber quality improvement.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2025Review
- A GDSL esterase/lipase gene GbGELP identified from a fiber micronaire QTL qMIC-A11 modulates cell elongation and fiber development.TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik · 2025Article
- Mining and identification of factors influencing multi-branch plasticity in ornamental kale.Planta · 2025Article
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8 authors.
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Abstract
Cotton (Gossypium) fiber length, a key trait determining fiber yield and quality, is highly regulated by a class of recently identified phytohormones, strigolactones (SLs). However, the underlying molecular mechanisms of SL signaling involved in fiber cell development are largely unknown. Here, we show that the SL signaling repressors MORE AXILLARY GROWTH2-LIKE7 (GhSMXL7) and GhSMXL8 negatively regulate cotton fiber elongation. Specifically, GhSMXL7 and GhSMXL8 inhibit the polyubiquitination and degradation of the gibberellin (GA)-triggered DELLA protein (GhSLR1). Biochemical analysis revealed that GhSMXL7 and GhSMXL8 physically interact with GhSLR1, which interferes with the association of GhSLR1 with the E3 ligase GA INSENSITIVE2 (GhGID2), leading to the repression of GA signal transduction. GhSMXL7 also interacts with the transcription factor GhHOX3, preventing its binding to the promoters of essential fiber elongation regulatory genes. Moreover, both GhSMXL7 and GhSMXL8 directly bind to the promoter regions of the AUXIN RESPONSE FACTOR (ARF) genes GhARF18-10A, GhARF18-10D, and GhARF19-7D to suppress their expression. Cotton plants in which GhARF18-10A, GhARF18-10D, and GhARF19-7D transcript levels had been reduced by virus-induced gene silencing (VIGS) displayed reduced fiber length compared with control plants. Collectively, our findings reveal a mechanism illustrating how SL integrates GA and auxin signaling to coordinately regulate plant cell elongation at the single-cell level.
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