AUGMIN Subunit8 Participates in Microtubule Reorientation in Arabidopsis Hypocotyls

AUGMIN subunit8 participates in microtubule reorientation in Arabidopsis hypocotyls.

Microtubules have important roles in intracellular trafficking. The targeted transport of cellulose synthase along microtubule tracks determines the orientation of cellulose microfibrils and hence influences cell shape and elongation (Lloyd, 2006; Paredez et al., 2006). The ability of microtubules to alter their cellular layout in response to various stimuli is central to their function. In the...

Arabidopsis AUGMIN subunit8 is a microtubule plus-end binding protein that promotes microtubule reorientation in hypocotyls.

In plant cells, cortical microtubules provide tracks for cellulose-synthesizing enzymes and regulate cell division, growth, and morphogenesis. The role of microtubules in these essential cellular processes depends on the spatial arrangement of the microtubules. Cortical microtubules are reoriented in response to changes in cell growth status and cell shape. Therefore, an understanding of the me...

Microtubule bundling plays a role in ethylene-mediated cortical microtubule reorientation in etiolated Arabidopsis hypocotyls.

The gaseous hormone ethylene is known to regulate plant growth under etiolated conditions (the 'triple response'). Although organization of cortical microtubules is essential for cell elongation, the underlying mechanisms that regulate microtubule organization by hormone signaling, including ethylene, are ambiguous. In the present study, we demonstrate that ethylene signaling participates in re...

Microtubule bundling plays a role in ethylene-mediated cortical microtubule reorientation in etiolated hypocotyls

Augmin-dependent microtubule nucleation at microtubule walls in the spindle

The formation of a functional spindle requires microtubule (MT) nucleation from within the spindle, which depends on augmin. How augmin contributes to MT formation and organization is not known because augmin-dependent MTs have never been specifically visualized. In this paper, we identify augmin-dependent MTs and their connections to other MTs by electron tomography and 3D modeling. In metapha...