Cotton fiber is a unicellular hair originating from the seed epidermis . Fiber development consists of four overlapping stages : fiber initiation fiber elongation secondary cell wall deposition and maturation .

它是由胚珠表皮细胞发育而来的 单 细胞 绒毛。棉纤维的发育可以分为四个明显不同但 略有重叠的阶段：纤维的分化和起始、细胞伸长、次生壁合成和纤维成熟。