Cotton fiber development and corresponding morphogenesis stages (according to [138, 139]). The initiation stage is characterized by the enlargement and protrusion of epidermal cells from the ovular surface; during the elongation stage the cells expend in polar directions with a rate of 2 mm/day; during the secondary cell wall deposition stage celluloses are synthesized rapidly until the fibers contain 90% of cellulose; and at the maturation stages minerals accumulate in the fibers and the fibers dehydrate.
