JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Down-regulation of GhADF1 gene expression affects cotton fibre properties.

Cotton fibre is the most important natural fibres for textile industry. To date, the mechanism that governs the development of fibre traits is largely unknown. In this study, we have characterized the function of a member of the actin depolymerizing factor (ADF) family in Gossypium hirsutum by down-regulation of the gene (designated as GhADF1) expression in the transgenic cotton plants. We observed that both the fibre length and strength of the GhADF1-underexpressing plants increased as compared to the wild-type fibre, and transgenic fibres contained more abundant F-actin filaments in the cortical region of the cells. Moreover, the secondary cell wall of the transgenic fibre appeared thicker and the cellulose content was higher than that of the control fibre. Our results suggest that organization of actin cytoskeleton regulated by actin-associated proteins such as GhADF1 plays a critical role in the processes of elongation and secondary cell wall formation during fibre development. Additionally, our study provided a candidate intrinsic gene for the improvement of fibre traits via genetic engineering.

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