Multiple microtubule nucleation sites in higher plants

In most eucaryotes, microtubule (MT) nucleation requires the activity of protein complexes containing -tubulin, Spc98p and Spc97p. These proteins form -tubulin ring complexes ( -TuRCs), which are recruited at structured MT organizing centers (MTOCs) (Moritz and Agard, 2001). In higher plants, the cytoskeleton organization in multiple MT arrays, which succeed one another during the cell cycle and developmental processes, may be linked to the dispersion of MTOC sites. The question remains open to know as to how and where plant MTs are nucleated.