Journal
PLANT AND CELL PHYSIOLOGY
Volume 45, Issue 9, Pages 1330-1334Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pcp/pch300
Keywords
Arabidopsis; dynamic instability; microtubules; oryzalin; propyzamide
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Previous studies showed that sub-micromolar concentrations of the microtubule-targeting herbicide propyzamide cause a right-handed helical arrangement of cortical microtubule arrays and left-handed twisting in elongating Arabidopsis epidermal cells. When seedlings were grown in the presence of 1-2 muM propyzamide or 50-100 nM oryzalin, we show that microtubules spent more time in a paused state in which they exhibited little net change in length. The drug treatment also resulted in slower growth and shortening velocities, increased catastrophe, and an overall decrease in microtubule turnover. A reduction in microtubule dynamic turnover may underlie the drug-induced rearrangement of cortical arrays.
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