Every fiber is a highly elongated single-celled trichome on the surface of cotton seeds. This study unprecedentedly reveals a new route to improve fiber traits by engineering the circadian clock of fiber cells.Ĭotton fibers are an important natural cellulose source for the textile industry worldwide. We uncover a fiber-specific circadian clock-controlled gene expression program in regulating fiber growth. Combining with scATAC-seq, we further identify two cardinal cis-regulatory elements (CREs, TCP motif, and TCP-like motif) which are bound by the trans factors GhTCP14s to modulate the circadian rhythmic metabolism of mitochondria and protein translation through regulating approximately one third of genes that are highly expressed in fiber cells. Moreover, we identify a small peptide GhRALF1 that circadian rhythmically controls fiber growth possibly through oscillating auxin signaling and proton pump activity in the plasma membrane. Interestingly, by time-course diurnal transcriptomic analysis, we demonstrate that the primary growth of fiber cells is a highly regulated circadian rhythmic process. By jointly analyzing the scRNA-seq data from wildtype and fl, we identify five cell populations including the fiber cell type and construct the development trajectory for fiber lineage cells. Here, we develop an optimized protoplasting method, and integrate single-cell RNA sequencing (scRNA-seq) and single-cell ATAC sequencing (scATAC-seq) to systematically characterize the cells of the outer integument of ovules from wild type and fuzzless/lintless ( fl) cotton (Gossypium hirsutum). ![]() However, the molecular mechanism of fiber cell growth is still poorly understood. The epidermis of cotton ovule produces fibers, the most important natural cellulose source for the global textile industry.
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