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A phragmosome (PS) is a transvacuolar aggregation of cytoplasm that develops in the plane of future cytokinesis and is found specifically in highly vacuolated cells. Although protonemal cells of Adiantum capillus-veneris L. usually do not form a PS, a PS-like structure developed at the site of a preprophase band (PPB) of microtubules (MTs) when the nucleus and endoplasm were displaced from the division...
. We have critically evaluated the possible functions of the plant cytoskeleton in root gravisensing and graviresponse and discussed the evidence that microtubules (MTs) and actin microfilaments (MFs) do not control differential cell growth during bending of roots. On the other hand, MF and MT networks are envisaged to participate in gravisensing because of the mechanical properties of the cytoskeletal...
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