TIP1 is a gene defined by an X-ray induced
allele tip1–2 and a previously described
EMS-induced allele tip1−1.
TIP1 is involved in plant cell growth.
tip1–2 plants display growth defects throughout
the plant and exhibit defects
in both root-hair and pollen-tube growth. tip1–2
plants are partly male sterile resulting from a combination of
pollen germination and pollen-tube defects; their root-hairs
are short, exhibit a tendency to branch and 2–4 hairs
can initiate from each hair cell. They are also slightly
dwarf in stature as a result of a general decrease in cell growth
indicating that TIP1 activity is required for
general cell growth. We propose a role for TIP in
both the initiation
and maintenance of growth in tip-growing cells. In addition
TIP1 activity is required for normal cell expansion
(non-tip cell growth) indicating that TIP1 is not
exclusively involved in tip-growth.