The COW1 Locus of Arabidopsis Acts after RHD2, and in Parallel with RHD3 and TIP1, to Determine the Shape, Rate of Elongation, and Number of Root Hairs Produced from Each Site of Hair Formation

摘要: Two recessive mutant alleles at CAN OF WORMS1 (COW1), a new locus involved in root hair morphogenesis, have been identified Arabidopsis thaliana L. Heynh. Root hairs on Cow1- mutants are short and wide occasionally formed as pairs single site of formation. The COW1 maps to chromosome 4. plants form the usual positions, suggesting that phenotype is not result abnormal positional signals. Cowl- roots begin formation normally, forming small bulge, or initiation site, normal size shape position hair-forming cell. However, when start elongate by tip growth, abnormalities elongation rate become apparent. Genetic evidence from double-mutant analysis cow1–1 other loci development supports our conclusion required during elongation.