Prof. Williams’ primary experimental organism is Arabidopsis thaliana.

Arabidopsis plants in the growth chamber

Arabidopsis plants up close and personal

A cross-section of main root stained
with Toluidine Blue

A developing lateral root at the four-cell stage,
viewed with Nomarski-DIC microscopy

View a movie clip (MPG) of vesicle movement in the root hairs of wild type
Arabidopsis. For ease of comparison, we have
circled a single vesicle for the first half of each movie.

View a move clip (MPG) of vesicle movement in the root hairs of a sac9 mutant.
Notice that the rate of movement of vesicles is much
higher in the sac9 mutant.