Plant Physiology Preview
Published on May 2, 2002; 10.1104/pp.001982
Received December 20, 2001
Returned for revision January 30, 2002
Accepted February 19, 2002
SOS4, A Pyridoxal Kinase Gene, Is Required for Root
Hair Development in Arabidopsis
Huazhong Shi and Jian-Kang Zhu *
Department of Plant Sciences, University of Arizona, Tucson, Arizona 85721
* Corresponding author; email: jkzhu{at}ag.arizona.edu.
Root hair development in plants is controlled by many genetic, hormonal, and environmental factors. A number of genes have been shown to be important for root hair formation. Arabidopsis salt overly sensitive 4 mutants were originally identified by screening for NaCl-hypersensitive growth. The SOS4 (Salt Overly Sensitive 4) gene was recently isolated by map-based cloning and shown to encode a pyridoxal (PL) kinase involved in the production of PL-5-phosphate, which is an important cofactor for various enzymes and a ligand for certain ion transporters. The root growth of sos4 mutants is slower than that of the wild type. Microscopic observations revealed that sos4 mutants do not have root hairs in the maturation zone. The sos4 mutations block the initiation of most root hairs, and impair the tip growth of those that are initiated. The root hairless phenotype of sos4 mutants was complemented by the wild-type SOS4 gene. SOS4 promoter-ß-glucuronidase analysis showed that SOS4 is expressed in the root hair and other hair-like structures. Consistent with SOS4 function as a PL kinase, in vitro application of pyridoxine and pyridoxamine, but not PL, partially rescued the root hair defect in sos4 mutants. 1-Aminocyclopropane-1-carboxylic acid and 2,4-dichlorophenoxyacetic acid treatments promoted root hair formation in both wild-type and sos4 plants, indicating that genetically SOS4 functions upstream of ethylene and auxin in root hair development. The possible role of SOS4 in ethylene and auxin biosynthesis is discussed.
This article has been cited by other articles:
|
|
|
|
 
A. Leblanc, H. Renault, J. Lecourt, P. Etienne, C. Deleu, and E. Le Deunff
Elongation Changes of Exploratory and Root Hair Systems Induced by Aminocyclopropane Carboxylic Acid and Aminoethoxyvinylglycine Affect Nitrate Uptake and BnNrt2.1 and BnNrt1.1 Transporter Gene Expression in Oilseed Rape
Plant Physiology,
April 1, 2008;
146(4):
1928 - 1940.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
E. Gonzalez, D. Danehower, and M. E. Daub
Vitamer Levels, Stress Response, Enzyme Activity, and Gene Regulation of Arabidopsis Lines Mutant in the Pyridoxine/Pyridoxamine 5'-Phosphate Oxidase (PDX3) and the Pyridoxal Kinase (SOS4) Genes Involved in the Vitamin B6 Salvage Pathway
Plant Physiology,
November 1, 2007;
145(3):
985 - 996.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
S. Wagner, A. Bernhardt, J. E. Leuendorf, C. Drewke, A. Lytovchenko, N. Mujahed, C. Gurgui, W. B. Frommer, E. Leistner, A. R. Fernie, et al.
Analysis of the Arabidopsis rsr4-1/pdx1-3 Mutant Reveals the Critical Function of the PDX1 Protein Family in Metabolism, Development, and Vitamin B6 Biosynthesis
PLANT CELL,
July 1, 2006;
18(7):
1722 - 1735.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
Z. Lei, A. M. Elmer, B. S. Watson, R. A. Dixon, P. J. Mendes, and L. W. Sumner
A Two-dimensional Electrophoresis Proteomic Reference Map and Systematic Identification of 1367 Proteins from a Cell Suspension Culture of the Model Legume Medicago truncatula
Mol. Cell. Proteomics,
November 1, 2005;
4(11):
1812 - 1825.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
W. Tyagi, D. Rajagopal, S. L. Singla-Pareek, M. K. Reddy, and S. K. Sopory
Cloning and Regulation of a Stress-regulated Pennisetum glaucum Vacuolar ATPase c Gene and Characterization of its Promoter that is Expressed in Shoot Hairs and Floral Organs
Plant Cell Physiol.,
August 1, 2005;
46(8):
1411 - 1422.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
S. J. Halperin, S. Gilroy, and J. P. Lynch
Sodium chloride reduces growth and cytosolic calcium, but does not affect cytosolic pH, in root hairs of Arabidopsis thaliana L.
J. Exp. Bot.,
April 1, 2003;
54(385):
1269 - 1280.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
