Cotton fibers (cotton lint) are single-celled trichomes that differentiate from the ovule epidermis. Unidirectional and fast-growing cells generally expand at the dome-shaped apical zone (tip-growth mode); however, previous studies suggest that elongating fiber cells expand via a diffuse-growth mode. Tip-localized Ca(2+) gradient and active secretary vesicle trafficking are two important phenomena of tip-growth. Recently, a high Ca(2+) gradient is found in the cytoplasm of fast-elongating cotton fiber cells near the growing tip. Several protein coding genes participating in vesicle coating and transport are highly expressed in elongating fiber cells. Taken together with the observation that ethylene acts as a positive regulator for cotton fiber and several Arabidopsis tissues that are known to elongate via tip growth prompted us to propose a linear-growth mode for similar cell types.
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