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A basic helix-loop-helix protein (GhFP1) promotes fibre elongation of cotton (Gossypium hirsutum) by modulating brassinosteroid biosynthesis and signalling. | LitMetric

AI Article Synopsis

  • Basic helix-loop-helix (bHLH) proteins play a key role in regulating various biological processes in plants, but their function in cotton fibre development was previously unclear.
  • This study identifies a specific cotton bHLH protein, GhFP1, as a positive regulator of fibre elongation; transgenic cotton with overexpressed GhFP1 showed significantly longer fibre lengths compared to wild-type plants.
  • GhFP1 is involved in activating brassinosteroid (BR) biosynthesis and promotes gene expression related to BR, while its homodimerization and interactions with other bHLH proteins may affect its ability to bind DNA effectively.

Article Abstract

Basic helix-loop-helix (bHLH) proteins are involved in transcriptional networks controlling a number of biological processes in plants. However, little information is known on the roles of bHLH proteins in cotton fibre development so far. Here, we show that a cotton bHLH protein (GhFP1) positively regulates fibre elongation. GhFP1 transgenic cotton and Arabidopsis plants were generated to study how GhFP1 regulates fibre cell elongation. Fibre length of the transgenic cotton overexpressing GhFP1 was significantly longer than that of wild-type, whereas suppression of GhFP1 expression hindered fibre elongation. Furthermore, overexpression of GhFP1 in Arabidopsis promoted trichome development. Expression of the brassinosteroid (BR)-related genes was markedly upregulated in fibres of GhFP1 overexpression cotton, but downregulated in GhFP1-silenced fibres. BR content in the transgenic fibres was significantly altered, relative to that in wild-type. Moreover, GhFP1 protein could directly bind to the promoters of GhDWF4 and GhCPD to activate expression of these BR-related genes. Therefore, our data suggest that GhFP1 as a positive regulator participates in controlling fibre elongation by activating BR biosynthesis and signalling. Additionally, homodimerisation of GhFP1 may be essential for its function, and interaction between GhFP1 and other cotton bHLH proteins may interfere with its DNA-binding activity.

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Source
http://dx.doi.org/10.1111/nph.16301DOI Listing

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