Abstract
The relationships between cell growth and the organization of cortical microtubules (MTs) in the coenocytic green alga Chamaedoris orientalis were studied by indirect immunofluorescence microscopical observation of cells treated with amiprophos-methyl (APM). This algal cell is cylindrical in shape and has cortical MTs arranged longitudinally at the lateral side of the cell but meridionally at the apices where growth occurs. When cells were treated with APM, growth stopped within 2 h, and the number of cortical MTs decreased with the duration of APM treatment. Cells treated for 20 h with APM restarted growth at the apices 10 h after the removal of APM, whereas cells treated for 48 h and more with APM produced new growing tips on the lateral side of the cell 7 d after the removal of APM
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