Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Published on January 26, 2007; 10.1104/pp.106.091546

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Received October 19, 2006
Accepted January 14, 2007

OsCSLD1, a Cellulose Synthase-Like D1 gene, Is Required for Root Hair Morphogenesis in Rice (Oryza sativa L.)

Chul Min Kim , Sung Han Park , Byoung Il Je , Su Hyun Park , Soon Ju Park , Hai Long Piao , Moo Young Eun , Liam Dolan , and Chang-deok Han *

Division of Applied Life Science, Plant Molecular Biology & Biotechnology Research Center (PMBBRC), Research Center, Environmental Biotechnology National Core Research Center, Gyeongsang National University, Jinju 660-701, Korea, (C.M.K., S.H.P., B.I.J., S.H.P., S.J.P., H.L.P., C.-d. H.) Rice functional genomics, National Institute of Agricultural Biotechnology, RDA, Suwon 441-707, Korea, Department of Cell and Developmental Biology, John Innes Centre, Norwich NR4 7UH, UK

* Corresponding author; email: cdhan{at}gsnu.ac.kr.

Root hairs are long tubular outgrowths that form on the surface of specialized epidermal cells. They are required for nutrient and water uptake and interact with the soil microflora. Here we show that the OsCSLD1 (Oryza sativa Cellulose Synthase Like D1) gene is required for root hair development, as rice mutants that lack OsCSLD1 function develop abnormal root hairs. In these mutants, while hair development is initiated normally, the hairs elongate less than the wild type hairs and they have kinks and swellings along their length. Since the csld1 mutants develop the same density and number of root hairs along their seminal root as the wild type plants, we propose that OsCSLD1 function is required for hair elongation but not initiation. Both gene trap expression pattern and in situ hybridization analyses indicate that OsCSLD1 is only expressed in root hair cells. Furthermore, OsCSLD1 is the only member of the four rice CSLD genes that shows root-specific expression. Given that the Arabidopsis gene KOJAK/AtCSLD3 is required for root hair elongation and is expressed in the root hair, it appears that OsCSLD1 may be the functional orthologue of KOJAK/AtCSLD3 and that these two genes represent the root hair-specific members of this family of proteins. Thus, at least part of the mechanism of root hair morphogenesis in Arabidopsis is conserved in rice.




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