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Journal of Cell Science, Vol 107, Issue 4 775-784, Copyright © 1994 by Company of Biologists
JOURNAL ARTICLES |
JM Hush, P Wadsworth, DA Callaham and PK Hepler
Biology Department, University of Massachusetts, Amherst 01003.
Microtubule (MT) turnover within the four principal MT arrays, the cortical array, the preprophase band, the mitotic spindle and the phragmoplast, has been measured in living stamen hair cells of Tradescantia that have been injected with fluorescent neurotubulin. Using the combined techniques of confocal laser scanning microscopy and fluorescence redistribution after photobleaching (FRAP), we report that the half-time of turnover in spindle MTs is t 1/2 = 31 +/- 6 seconds, which is in excellent agreement with previous measurements of turnover in animal cell spindles. Tradescantia interphase MTs, however, exhibit turnover rates (t 1/2 = 67 +/- seconds) that are some 3.4-fold faster than those measured in interphase mammalian cells, and thus are revealed as being highly dynamic. Preprophase band and phragmoplast MTs have turnover rates similar to those of interphase MTs in Tradescantia. The spatial and temporal aspects of the fluorescence redistribution after photobleaching in all four MT arrays are more consistent with subunit exchange by the mechanism of dynamic instability than treadmilling. This is the first quantification of MT dynamics in plant cells.
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