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Microtubules in epidermal and cortical root cells of Brassica rapa under clinorotation
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Using confocal microscopy the organization of tubulin cytoskeleton including endoplasmic and cortical microtubules (CMTs) has been studied in epidermal and cortical cells of the different growth zones of main root of Brassica rapa L. 6-days-old seedlings in control conditions and under clinorotation. It was shown that changes in CMTs orientation occured only in the distal elongation zone (DEZ). In the control, CMT arrays oriented transversely to the root long axis. Under clinorotation appearance of the shorter randomly organized CMTs was observed. Simultaneously, a significant decrease in the cell length in the central elongation zone (CEZ) under clinorotation was detected. It is suggested that the decline of anisotropic growth typical for CEZ cells is connected with CMTs disorientation under clinorotation.
Key words: cortical microtubules (CMTs), endoplasmic microtubules (EMTs), clinorotation, distal elongation zone (DEZ), confocal microscopy, Brassica rapa
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