The myosin xi-i mutant contains aberrant spherical nuclei
with abnormally invaginated nuclear envelope [36].
Among single mutants of the 13 members of myosin
XI, only myosin xi-i exhibits a spherical nuclear shape,
indicating that myosin XI-i is the predominant myosin XI
involved in nuclear morphology, which is spindle-shaped
in wild-type cells [36]. Consistently, only myosin XI-i is
localized to the nuclear envelope [18
,36,37]. On the
other hand, extremely elongated nuclei are reported in
trichome cells of myosin xik and myosin xi2 mutants [45]. A
possible explanation is that defective F-actin organization
or dynamics in myosin xik and myosin xi2 may affect the
myosin XI-i-dependent nuclear shape.
Myosi