In an example of some cotton sorts in-vivo observations were carried out of native defects originating in cotton hairs during their development in a non- opened cotton boll. It is shown, that the appearance of morphological structural defects in cotton hairs is related to the features of their packaging in a fruit; cotton boll during the formation of socalled segment of cotton boll. A mechanism explaining the cause of the morphological defects origination in fibers is proposed. . It is based on consideration of hydrodynamic properties of cytoplasm in living cotton hairs at the places of their bending.
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