Abstract
We isolated a recessive mutant defective in root hair elongation from RIKEN Arabidopsis Ds transposon insertion lines. In the mutant, 15-1096-1, the tip growths of almost all root hairs are stopped and their tips are ruptured. The transposon is inserted into a gene encoding a glycosylphosphatidylinositol (GPI) -anchored protein, indicating that 15-1096-1 is allelic to the shv3 (Parker et al., 2000; Jones, et al., 2006). Arabidopsis has five proteins with the same domain structure as SHV3 that seems unique to plants. Expression analysis of the corresponding genes showed their distinct and overlapping tissue distributions. The double mutant between shv3 and disruption of the family member showed some additional phenotypes related to cell expansion and had aberrant cell wall, suggesting that SHV3 and the family members are novel players involved in cell wall organization required for the regulation of cell expansion.
